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  • Base Sequence
  • American Association for the Advancement of Science (AAAS)  (26)
  • American Association of Petroleum Geologists (AAPG)
  • 2005-2009  (26)
  • 2007  (26)
Collection
Publisher
  • American Association for the Advancement of Science (AAAS)  (26)
  • American Association of Petroleum Geologists (AAPG)
Years
  • 2005-2009  (26)
Year
  • 1
    Publication Date: 2007-10-27
    Description: We report the cloning of Style2.1, the major quantitative trait locus responsible for a key floral attribute (style length) associated with the evolution of self-pollination in cultivated tomatoes. The gene encodes a putative transcription factor that regulates cell elongation in developing styles. The transition from cross-pollination to self-pollination was accompanied, not by a change in the STYLE2.1 protein, but rather by a mutation in the Style2.1 promoter that results in a down-regulation of Style2.1 expression during flower development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Kai-Yi -- Cong, Bin -- Wing, Rod -- Vrebalov, Julia -- Tanksley, Steven D -- New York, N.Y. -- Science. 2007 Oct 26;318(5850):643-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Breeding and Genetics, Cornell University, Ithaca, NY 14853, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17962563" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Biological Evolution ; Chromosome Mapping ; Cloning, Molecular ; Crosses, Genetic ; Down-Regulation ; Flowers/*anatomy & histology/genetics/growth & development ; Genes, Plant ; Genotype ; Helix-Loop-Helix Motifs ; Lycopersicon esculentum/anatomy & histology/*genetics/*physiology ; Molecular Sequence Data ; Plant Proteins/chemistry/*genetics/metabolism ; Pollen/physiology ; Promoter Regions, Genetic ; Quantitative Trait Loci ; Reproduction ; Sequence Deletion ; Transcription Factors/chemistry/*genetics/metabolism ; Transformation, Genetic
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2007-04-14
    Description: A systematic fluorescence in situ hybridization comparison of macaque and human synteny organization disclosed five additional macaque evolutionary new centromeres (ENCs) for a total of nine ENCs. To understand the dynamics of ENC formation and progression, we compared the ENC of macaque chromosome 4 with the human orthologous region, at 6q24.3, that conserves the ancestral genomic organization. A 250-kilobase segment was extensively duplicated around the macaque centromere. These duplications were strictly intrachromosomal. Our results suggest that novel centromeres may trigger only local duplication activity and that the absence of genes in the seeding region may have been important in ENC maintenance and progression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ventura, Mario -- Antonacci, Francesca -- Cardone, Maria Francesca -- Stanyon, Roscoe -- D'Addabbo, Pietro -- Cellamare, Angelo -- Sprague, L James -- Eichler, Evan E -- Archidiacono, Nicoletta -- Rocchi, Mariano -- GM58815/GM/NIGMS NIH HHS/ -- HG002385/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 2007 Apr 13;316(5822):243-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics and Microbiology, University of Bari, 70126 Bari, Italy.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17431171" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; *Centromere ; Chromosomes, Human, Pair 6 ; Dna ; *Evolution, Molecular ; Gene Duplication ; Humans ; Macaca mulatta/*genetics ; Molecular Sequence Data ; Sequence Tagged Sites ; Synteny
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  • 3
    Publication Date: 2007-10-20
    Description: A computational analysis of the nuclear genome of a red alga, Cyanidioschyzon merolae, identified 11 transfer RNA (tRNA) genes in which the 3' half of the tRNA lies upstream of the 5' half in the genome. We verified that these genes are expressed and produce mature tRNAs that are aminoacylated. Analysis of tRNA-processing intermediates for these genes indicates an unusual processing pathway in which the termini of the tRNA precursor are ligated, resulting in formation of a characteristic circular RNA intermediate that is then processed at the acceptor stem to generate the correct termini.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Soma, Akiko -- Onodera, Akinori -- Sugahara, Junichi -- Kanai, Akio -- Yachie, Nozomu -- Tomita, Masaru -- Kawamura, Fujio -- Sekine, Yasuhiko -- New York, N.Y. -- Science. 2007 Oct 19;318(5849):450-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Life Science, College of Science, Rikkyo (St. Paul's) University, Toshima, Tokyo 171-8501, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17947580" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; DNA, Algal/chemistry/genetics ; *Genes ; Methionine-tRNA Ligase/metabolism ; Molecular Sequence Data ; Nucleic Acid Conformation ; RNA/chemistry/genetics/*metabolism ; RNA Processing, Post-Transcriptional ; RNA, Algal/*genetics/metabolism ; RNA, Transfer/*genetics/metabolism ; RNA, Transfer, Amino Acyl/metabolism ; Rhodophyta/*genetics/metabolism ; Transcription, Genetic
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  • 4
    Publication Date: 2007-07-14
    Description: The temporal and spatial regulation of gene expression in mammalian development is linked to the establishment of functional chromatin domains. Here, we report that tissue-specific transcription of a retrotransposon repeat in the murine growth hormone locus is required for gene activation. This repeat serves as a boundary to block the influence of repressive chromatin modifications. The repeat element is able to generate short, overlapping Pol II-and Pol III-driven transcripts, both of which are necessary and sufficient to enable a restructuring of the regulated locus into nuclear compartments. These data suggest that transcription of interspersed repetitive sequences may represent a developmental strategy for the establishment of functionally distinct domains within the mammalian genome to control gene activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lunyak, Victoria V -- Prefontaine, Gratien G -- Nunez, Esperanza -- Cramer, Thorsten -- Ju, Bong-Gun -- Ohgi, Kenneth A -- Hutt, Kasey -- Roy, Rosa -- Garcia-Diaz, Angel -- Zhu, Xiaoyan -- Yung, Yun -- Montoliu, Lluis -- Glass, Christopher K -- Rosenfeld, Michael G -- New York, N.Y. -- Science. 2007 Jul 13;317(5835):248-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, School of Medicine, University of California, San Diego, 9500 Gilman Drive, Room 345, La Jolla, CA 92093-0648, USA. vlunyak@uscd.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17626886" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Chromatin Immunoprecipitation ; DNA Polymerase II/metabolism ; DNA Polymerase III/metabolism ; *Gene Expression Regulation, Developmental ; Growth Hormone/*genetics ; Histones/metabolism ; *Insulator Elements ; Methylation ; Mice ; Mice, Transgenic ; Molecular Sequence Data ; *Organogenesis ; Pituitary Gland/*embryology/metabolism ; *Short Interspersed Nucleotide Elements ; *Transcription, Genetic ; Transcriptional Activation
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  • 5
    Publication Date: 2007-06-30
    Description: HIV-1 integrates into the host chromosome and persists as a provirus flanked by long terminal repeats (LTRs). To date, treatment regimens primarily target the virus enzymes or virus-cell fusion, but not the integrated provirus. We report here the substrate-linked protein evolution of a tailored recombinase that recognizes an asymmetric sequence within an HIV-1 LTR. This evolved recombinase efficiently excised integrated HIV proviral DNA from the genome of infected cells. Although a long way from use in the clinic, we speculate that this type of technology might be adapted in future antiretroviral therapies, among other possible uses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sarkar, Indrani -- Hauber, Ilona -- Hauber, Joachim -- Buchholz, Frank -- New York, N.Y. -- Science. 2007 Jun 29;316(5833):1912-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck-Institute for Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, D-01307 Dresden, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17600219" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; DNA Shuffling ; DNA, Viral/*metabolism ; *Directed Molecular Evolution ; Escherichia coli/genetics ; Gene Library ; Genome, Human ; *HIV Long Terminal Repeat ; HIV-1/*metabolism ; HeLa Cells ; Humans ; Integrases/*genetics/*metabolism ; Molecular Sequence Data ; Mutation ; Proviruses/metabolism ; Recombination, Genetic ; *Virus Integration
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  • 6
    Publication Date: 2007-01-16
    Description: A major goal of systems biology is to predict the function of biological networks. Although network topologies have been successfully determined in many cases, the quantitative parameters governing these networks generally have not. Measuring affinities of molecular interactions in high-throughput format remains problematic, especially for transient and low-affinity interactions. We describe a high-throughput microfluidic platform that measures such properties on the basis of mechanical trapping of molecular interactions. With this platform we characterized DNA binding energy landscapes for four eukaryotic transcription factors; these landscapes were used to test basic assumptions about transcription factor binding and to predict their in vivo function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Maerkl, Sebastian J -- Quake, Stephen R -- New York, N.Y. -- Science. 2007 Jan 12;315(5809):233-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biochemistry and Molecular Biophysics Option, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17218526" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Basic Helix-Loop-Helix Leucine Zipper Transcription Factors/metabolism ; Basic Helix-Loop-Helix Transcription Factors/*metabolism ; Computational Biology ; Computer Simulation ; DNA/*metabolism ; DNA, Fungal/genetics/metabolism ; DNA-Binding Proteins/metabolism ; E-Box Elements ; Gene Expression Regulation, Fungal ; Helix-Loop-Helix Motifs ; Humans ; *Microfluidic Analytical Techniques ; Oligonucleotide Array Sequence Analysis ; Protein Binding ; Protein Isoforms/metabolism ; Regulatory Sequences, Nucleic Acid ; Repressor Proteins/metabolism ; Saccharomyces cerevisiae/genetics ; Saccharomyces cerevisiae Proteins/metabolism ; *Systems Biology ; Templates, Genetic ; Thermodynamics ; Transcription Factors/metabolism
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  • 7
    Publication Date: 2007-11-03
    Description: Increasingly complex networks of small RNAs act through RNA-interference (RNAi) pathways to regulate gene expression, to mediate antiviral responses, to organize chromosomal domains, and to restrain the spread of selfish genetic elements. Historically, RNAi has been defined as a response to double-stranded RNA. However, some small RNA species may not arise from double-stranded RNA precursors. Yet, like microRNAs and small interfering RNAs, such species guide Argonaute proteins to silencing targets through complementary base-pairing. Silencing can be achieved by corecruitment of accessory factors or through the activity of Argonaute itself, which often has endonucleolytic activity. As a specific and adaptive regulatory system, RNAi is used throughout eukarya, which indicates a long evolutionary history. A likely function of RNAi throughout that history is to protect the genome from both pathogenic and parasitic invaders.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Aravin, Alexei A -- Hannon, Gregory J -- Brennecke, Julius -- New York, N.Y. -- Science. 2007 Nov 2;318(5851):761-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Watson School of Biological Sciences, Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17975059" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Biological ; Animals ; Argonaute Proteins ; Base Sequence ; *DNA Transposable Elements ; Drosophila Proteins ; Evolution, Molecular ; Gene Silencing ; Molecular Sequence Data ; Proteins/genetics/physiology ; *RNA, Small Interfering ; RNA-Binding Proteins/genetics/*physiology ; RNA-Induced Silencing Complex
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2007-10-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pennisi, Elizabeth -- New York, N.Y. -- Science. 2007 Oct 12;318(5848):190-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17932267" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Classification/methods ; Computational Biology ; DNA Probes ; DNA, Chloroplast/*genetics ; DNA, Intergenic/*genetics ; Databases, Nucleic Acid ; Genes, Plant ; Plants/*classification/*genetics ; Plants, Medicinal/classification/genetics ; Sequence Analysis, DNA ; Trees/classification/genetics
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  • 9
    Publication Date: 2007-01-06
    Description: MicroRNAs (miRNAs) negatively regulate partially complementary target messenger RNAs. Target selection in animals is dictated primarily by sequences at the miRNA 5' end. We demonstrated that despite their small size, specific miRNAs contain additional sequence elements that control their posttranscriptional behavior, including their subcellular localization. We showed that human miR-29b, in contrast to other studied animal miRNAs, is predominantly localized to the nucleus. The distinctive hexanucleotide terminal motif of miR-29b acts as a transferable nuclear localization element that directs nuclear enrichment of miRNAs or small interfering RNAs to which it is attached. Our results indicate that miRNAs sharing common 5' sequences, considered to be largely redundant, might have distinct functions because of the influence of cis-acting regulatory motifs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hwang, Hun-Way -- Wentzel, Erik A -- Mendell, Joshua T -- New York, N.Y. -- Science. 2007 Jan 5;315(5808):97-100.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Program in Human Genetics and Molecular Biology, McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17204650" target="_blank"〉PubMed〈/a〉
    Keywords: Active Transport, Cell Nucleus ; Animals ; Apoptosis ; Base Sequence ; Cell Nucleus/*metabolism ; HeLa Cells ; Humans ; Mice ; MicroRNAs/*chemistry/*metabolism ; Mitosis ; Mutation ; NIH 3T3 Cells ; Oligoribonucleotides/chemistry/*metabolism ; RNA Processing, Post-Transcriptional ; RNA Stability ; RNA, Small Interfering ; Reverse Transcriptase Polymerase Chain Reaction ; Ribonuclease III/metabolism ; Transcription, Genetic
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  • 10
    Publication Date: 2007-06-02
    Description: Sponges (phylum Porifera) were prolific reef-building organisms during the Paleozoic and Mesozoic approximately 542 to 65 million years ago. These ancient animals inherited components of the first multicellular skeletogenic toolkit from the last common ancestor of the Metazoa. Using a paleogenomics approach, including gene- and protein-expression techniques and phylogenetic reconstruction, we show that a molecular component of this toolkit was the precursor to the alpha-carbonic anhydrases (alpha-CAs), a gene family used by extant animals in a variety of fundamental physiological processes. We used the coralline demosponge Astrosclera willeyana, a "living fossil" that has survived from the Mesozoic, to provide insight into the evolution of the ability to biocalcify, and show that the alpha-CA family expanded from a single ancestral gene through several independent gene-duplication events in sponges and eumetazoans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jackson, Daniel J -- Macis, Luciana -- Reitner, Joachim -- Degnan, Bernard M -- Worheide, Gert -- New York, N.Y. -- Science. 2007 Jun 29;316(5833):1893-5. Epub 2007 May 31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geoscience Centre Gottingen, Department of Geobiology, Goldschmidtstrasse 3, D-37077 Gottingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17540861" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Bicarbonates/metabolism ; *Calcification, Physiologic ; Calcium Carbonate/analysis/metabolism ; Carbonic Anhydrases/chemistry/*genetics/*metabolism ; Computational Biology ; Evolution, Molecular ; Gene Duplication ; Genes ; Genomics ; Molecular Sequence Data ; Porifera/anatomy & histology/enzymology/*genetics/*physiology ; Recombinant Proteins/chemistry/metabolism
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  • 11
    Publication Date: 2007-07-21
    Description: The genomes of individuals from the same species vary in sequence as a result of different evolutionary processes. To examine the patterns of, and the forces shaping, sequence variation in Arabidopsis thaliana, we performed high-density array resequencing of 20 diverse strains (accessions). More than 1 million nonredundant single-nucleotide polymorphisms (SNPs) were identified at moderate false discovery rates (FDRs), and approximately 4% of the genome was identified as being highly dissimilar or deleted relative to the reference genome sequence. Patterns of polymorphism are highly nonrandom among gene families, with genes mediating interaction with the biotic environment having exceptional polymorphism levels. At the chromosomal scale, regional variation in polymorphism was readily apparent. A scan for recent selective sweeps revealed several candidate regions, including a notable example in which almost all variation was removed in a 500-kilobase window. Analyzing the polymorphisms we describe in larger sets of accessions will enable a detailed understanding of forces shaping population-wide sequence variation in A. thaliana.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Clark, Richard M -- Schweikert, Gabriele -- Toomajian, Christopher -- Ossowski, Stephan -- Zeller, Georg -- Shinn, Paul -- Warthmann, Norman -- Hu, Tina T -- Fu, Glenn -- Hinds, David A -- Chen, Huaming -- Frazer, Kelly A -- Huson, Daniel H -- Scholkopf, Bernhard -- Nordborg, Magnus -- Ratsch, Gunnar -- Ecker, Joseph R -- Weigel, Detlef -- New York, N.Y. -- Science. 2007 Jul 20;317(5836):338-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Max Planck Institute for Developmental Biology, 72076 Tubingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17641193" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Arabidopsis/*genetics ; Base Sequence ; Chromosomes, Plant/genetics ; Computational Biology ; Gene Frequency ; Genes, Plant ; *Genetic Variation ; *Genome, Plant ; Molecular Sequence Data ; *Polymorphism, Genetic ; *Polymorphism, Single Nucleotide ; Selection, Genetic ; Sequence Analysis, DNA
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  • 12
    Publication Date: 2007-01-20
    Description: Cysteine (Cys) residues often play critical roles in proteins; however, identification of their specific functions has been limited to case-by-case experimental approaches. We developed a procedure for high-throughput identification of catalytic redox-active Cys in proteins by searching for sporadic selenocysteine-Cys pairs in sequence databases. This method is independent of protein family, structure, and taxon. We used it to selectively detect the majority of known proteins with redox-active Cys and to make additional predictions, one of which was verified. Rapid accumulation of sequence information from genomic and metagenomic projects should allow detection of many additional oxidoreductase families as well as identification of redox-active Cys in these proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fomenko, Dmitri E -- Xing, Weibing -- Adair, Blakely M -- Thomas, David J -- Gladyshev, Vadim N -- AG021518/AG/NIA NIH HHS/ -- GM061603/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2007 Jan 19;315(5810):387-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Nebraska, Lincoln, NE 68588, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17234949" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Archaeal Proteins/chemistry ; Bacterial Proteins/chemistry ; Base Sequence ; Catalysis ; Computational Biology ; Cysteine/analysis/*chemistry ; *Databases, Nucleic Acid ; *Databases, Protein ; Enzymes/*chemistry ; Eukaryotic Cells ; Evolution, Molecular ; Methyltransferases/chemistry ; Molecular Sequence Data ; Oxidation-Reduction ; Oxidoreductases/chemistry ; Proteins/*chemistry ; Selenocysteine/chemistry ; Selenoproteins/*chemistry
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  • 13
    Publication Date: 2007-06-26
    Description: Primate genomes contain a large number of endogenous retroviruses and encode evolutionarily dynamic proteins that provide intrinsic immunity to retroviral infections. We report here the resurrection of the core protein of a 4-million-year-old endogenous virus from the chimpanzee genome and show that the human variant of the intrinsic immune protein TRIM5alpha can actively prevent infection by this virus. However, we suggest that selective changes that have occurred in the human lineage during the acquisition of resistance to this virus, and perhaps similar viruses, may have left our species more susceptible to infection by human immunodeficiency virus type 1 (HIV-1).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, Shari M -- Malik, Harmit S -- Emerman, Michael -- New York, N.Y. -- Science. 2007 Jun 22;316(5832):1756-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular and Cellular Biology Program, University of Washington, Seattle, WA 98195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17588933" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Biological Evolution ; Carrier Proteins/genetics/*physiology ; Cats ; Cell Line ; Dna ; Disease Susceptibility ; Endogenous Retroviruses/genetics/*physiology ; Evolution, Molecular ; Gorilla gorilla ; HIV Infections/genetics/immunology ; Hiv-1 ; Humans ; Immunity, Innate/genetics ; Macaca mulatta ; Molecular Sequence Data ; Pan troglodytes/genetics/virology ; Retroviridae Infections/genetics/immunology
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  • 14
    Publication Date: 2007-02-27
    Description: Primary transcripts of certain microRNA (miRNA) genes are subject to RNA editing that converts adenosine to inosine. However, the importance of miRNA editing remains largely undetermined. Here we report that tissue-specific adenosine-to-inosine editing of miR-376 cluster transcripts leads to predominant expression of edited miR-376 isoform RNAs. One highly edited site is positioned in the middle of the 5'-proximal half "seed" region critical for the hybridization of miRNAs to targets. We provide evidence that the edited miR-376 RNA silences specifically a different set of genes. Repression of phosphoribosyl pyrophosphate synthetase 1, a target of the edited miR-376 RNA and an enzyme involved in the uric-acid synthesis pathway, contributes to tight and tissue-specific regulation of uric-acid levels, revealing a previously unknown role for RNA editing in miRNA-mediated gene silencing.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2953418/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2953418/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kawahara, Yukio -- Zinshteyn, Boris -- Sethupathy, Praveen -- Iizasa, Hisashi -- Hatzigeorgiou, Artemis G -- Nishikura, Kazuko -- P01 CA072765/CA/NCI NIH HHS/ -- P01 CA072765-050002/CA/NCI NIH HHS/ -- R01 GM040536/GM/NIGMS NIH HHS/ -- R01 GM040536-16/GM/NIGMS NIH HHS/ -- R01 HL070045/HL/NHLBI NIH HHS/ -- R01 HL070045-04/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2007 Feb 23;315(5815):1137-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104, USA. ykawahara@wistar.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17322061" target="_blank"〉PubMed〈/a〉
    Keywords: 3' Untranslated Regions ; Adenosine/*metabolism ; Adenosine Deaminase/genetics/metabolism ; Animals ; Base Sequence ; Brain/metabolism ; HeLa Cells ; Humans ; Inosine/*metabolism ; Liver/metabolism ; Mice ; MicroRNAs/chemistry/genetics/*metabolism ; Molecular Sequence Data ; Nucleic Acid Conformation ; Organ Specificity ; Protein-Serine-Threonine Kinases/genetics/metabolism ; *RNA Editing ; *RNA Interference ; RNA-Binding Proteins ; Ribose-Phosphate Pyrophosphokinase/genetics/metabolism ; Uric Acid/metabolism
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  • 15
    Publication Date: 2007-08-11
    Description: Characterization of interspecies differences in gene regulation is crucial for understanding the molecular basis of both phenotypic diversity and evolution. By means of chromatin immunoprecipitation and DNA microarray analysis, the divergence in the binding sites of the pseudohyphal regulators Ste12 and Tec1 was determined in the yeasts Saccharomyces cerevisiae, S. mikatae, and S. bayanus under pseudohyphal conditions. We have shown that most of these sites have diverged across these species, far exceeding the interspecies variation in orthologous genes. A group of Ste12 targets was shown to be bound only in S. mikatae and S. bayanus under pseudohyphal conditions. Many of these genes are targets of Ste12 during mating in S. cerevisiae, indicating that specialization between the two pathways has occurred in this species. Transcription factor binding sites have therefore diverged substantially faster than ortholog content. Thus, gene regulation resulting from transcription factor binding is likely to be a major cause of divergence between related species.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Borneman, Anthony R -- Gianoulis, Tara A -- Zhang, Zhengdong D -- Yu, Haiyuan -- Rozowsky, Joel -- Seringhaus, Michael R -- Wang, Lu Yong -- Gerstein, Mark -- Snyder, Michael -- New York, N.Y. -- Science. 2007 Aug 10;317(5839):815-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06511, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17690298" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Candida albicans/genetics/growth & development/metabolism ; Chromatin Immunoprecipitation ; DNA-Binding Proteins/genetics/metabolism ; *Evolution, Molecular ; Fungal Proteins/genetics/*metabolism ; Gene Expression Regulation, Fungal ; Gene Regulatory Networks ; Genes, Fungal ; Oligonucleotide Array Sequence Analysis ; *Regulatory Sequences, Nucleic Acid ; Saccharomyces/*genetics/growth & development/metabolism ; Saccharomyces cerevisiae/*genetics/growth & development/metabolism ; Saccharomyces cerevisiae Proteins/genetics/metabolism ; Transcription Factors/genetics/*metabolism
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  • 16
    Publication Date: 2007-10-20
    Description: Hundreds of species of reef-building corals spawn synchronously over a few nights each year, and moonlight regulates this spawning event. However, the molecular elements underpinning the detection of moonlight remain unknown. Here we report the presence of an ancient family of blue-light-sensing photoreceptors, cryptochromes, in the reef-building coral Acropora millepora. In addition to being cryptochrome genes from one of the earliest-diverging eumetazoan phyla, cry1 and cry2 were expressed preferentially in light. Consistent with potential roles in the synchronization of fundamentally important behaviors such as mass spawning, cry2 expression increased on full moon nights versus new moon nights. Our results demonstrate phylogenetically broad roles of these ancient circadian clock-related molecules in the animal kingdom.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levy, O -- Appelbaum, L -- Leggat, W -- Gothlif, Y -- Hayward, D C -- Miller, D J -- Hoegh-Guldberg, O -- New York, N.Y. -- Science. 2007 Oct 19;318(5849):467-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Marine Studies, University of Queensland, St. Lucia 4072 QLD, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17947585" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anthozoa/*genetics/*metabolism ; Base Sequence ; Circadian Rhythm ; Cryptochromes ; Flavoproteins/analysis/*genetics/*metabolism ; Gene Expression Regulation ; *Light ; Molecular Sequence Data ; Moon
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  • 17
    Publication Date: 2007-06-30
    Description: Circadian and other natural clock-like endogenous rhythms may have evolved to anticipate regular temporal changes in the environment. We report that a mutation in the circadian clock gene timeless in Drosophila melanogaster has arisen and spread by natural selection relatively recently in Europe. We found that, when introduced into different genetic backgrounds, natural and artificial alleles of the timeless gene affect the incidence of diapause in response to changes in light and temperature. The natural mutant allele alters an important life history trait that may enhance the fly's adaptation to seasonal conditions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tauber, Eran -- Zordan, Mauro -- Sandrelli, Federica -- Pegoraro, Mirko -- Osterwalder, Nicolo -- Breda, Carlo -- Daga, Andrea -- Selmin, Alessandro -- Monger, Karen -- Benna, Clara -- Rosato, Ezio -- Kyriacou, Charalambos P -- Costa, Rodolfo -- New York, N.Y. -- Science. 2007 Jun 29;316(5833):1895-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, University of Leicester, Leicester LE1 7RH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17600215" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; Animals ; Base Sequence ; Circadian Rhythm/genetics ; Drosophila Proteins/*genetics/physiology ; Drosophila melanogaster/*genetics/*physiology ; Europe ; Evolution, Molecular ; Female ; Geography ; Haplotypes ; Molecular Sequence Data ; Mutation ; *Photoperiod ; Phylogeny ; Polymorphism, Genetic ; Protein Isoforms/genetics/physiology ; Reproduction ; *Seasons ; *Selection, Genetic ; Temperature ; Transformation, Genetic
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  • 18
    Publication Date: 2007-10-27
    Description: Plant disease resistance (R) proteins recognize matching pathogen avirulence proteins. Alleles of the pepper R gene Bs3 mediate recognition of the Xanthomonas campestris pv. vesicatoria (Xcv) type III effector protein AvrBs3 and its deletion derivative AvrBs3Deltarep16. Pepper Bs3 and its allelic variant Bs3-E encode flavin monooxygenases with a previously unknown structure and are transcriptionally activated by the Xcv effector proteins AvrBs3 and AvrBs3Deltarep16, respectively. We found that recognition specificity resides in the Bs3 and Bs3-E promoters and is determined by binding of AvrBs3 or AvrBs3Deltarep16 to a defined promoter region. Our data suggest a recognition mechanism in which the Avr protein binds and activates the promoter of the cognate R gene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Romer, Patrick -- Hahn, Simone -- Jordan, Tina -- Strauss, Tina -- Bonas, Ulla -- Lahaye, Thomas -- New York, N.Y. -- Science. 2007 Oct 26;318(5850):645-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biology, Department of Genetics, Martin-Luther-University Halle-Wittenberg, D-06099 Halle (Saale), Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17962564" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Bacterial Proteins/genetics/*metabolism ; Base Sequence ; Capsicum/*genetics/*microbiology ; Chromosomes, Artificial, Bacterial ; Gene Expression Regulation, Plant ; *Genes, Plant ; Mixed Function Oxygenases/chemistry/*genetics ; Molecular Sequence Data ; Plant Diseases/immunology/microbiology ; Plant Leaves/genetics/metabolism ; Plant Proteins/chemistry/genetics ; *Promoter Regions, Genetic ; Tobacco/genetics ; Transcription, Genetic ; Transformation, Genetic ; Xanthomonas campestris/genetics/metabolism/*pathogenicity
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  • 19
    Publication Date: 2007-10-20
    Description: Nonhomologous end joining (NHEJ) is a critical DNA double-strand break (DSB) repair pathway required to maintain genome stability. Many prokaryotes possess a minimalist NHEJ apparatus required to repair DSBs during stationary phase, composed of two conserved core proteins, Ku and ligase D (LigD). The crystal structure of Mycobacterium tuberculosis polymerase domain of LigD mediating the synapsis of two noncomplementary DNA ends revealed a variety of interactions, including microhomology base pairing, mismatched and flipped-out bases, and 3' termini forming hairpin-like ends. Biochemical and biophysical studies confirmed that polymerase-induced end synapsis also occurs in solution. We propose that this DNA synaptic structure reflects an intermediate bridging stage of the NHEJ process, before end processing and ligation, with both the polymerase and the DNA sequence playing pivotal roles in determining the sequential order of synapsis and remodeling before end joining.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brissett, Nigel C -- Pitcher, Robert S -- Juarez, Raquel -- Picher, Angel J -- Green, Andrew J -- Dafforn, Timothy R -- Fox, Gavin C -- Blanco, Luis -- Doherty, Aidan J -- BB/D522746/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- G120/738/Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2007 Oct 19;318(5849):456-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genome Damage and Stability Centre, University of Sussex, Brighton BN1 9RQ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17947582" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Crystallography, X-Ray ; DNA Ligases/*chemistry/genetics/metabolism ; *DNA Repair ; DNA, Bacterial/*chemistry/metabolism ; Dimerization ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Mycobacterium tuberculosis/*chemistry/enzymology/genetics/metabolism ; Protein Conformation ; Protein Structure, Tertiary
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  • 20
    Publication Date: 2007-12-01
    Description: Molecular patterns in pathogenic RNAs can be recognized by the innate immune system, and a component of this response is the interferon-induced enzyme RNA-activated protein kinase (PKR). The major activators of PKR have been proposed to be long double-stranded RNAs. We report that RNAs with very limited secondary structures activate PKR in a 5'-triphosphate-dependent fashion in vitro and in vivo. Activation of PKR by 5'-triphosphate RNA is independent of RIG-I and is enhanced by treatment with type 1 interferon (IFN-alpha). Surveillance of molecular features at the 5' end of transcripts by PKR presents a means of allowing pathogenic RNA to be distinguished from self-RNA. The evidence presented here suggests that this form of RNA-based discrimination may be a critical step in mounting an early immune response.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nallagatla, Subba Rao -- Hwang, Jungwook -- Toroney, Rebecca -- Zheng, Xiaofeng -- Cameron, Craig E -- Bevilacqua, Philip C -- GM58709/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2007 Nov 30;318(5855):1455-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Pennsylvania State University, University Park, PA 16802, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18048689" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Cell Line, Tumor ; Cercopithecus aethiops ; DEAD-box RNA Helicases/metabolism ; Enzyme Activation ; Eukaryotic Initiation Factor-2/metabolism ; Humans ; Immunity, Innate ; Interferon-alpha/immunology/metabolism ; Interferon-beta/metabolism ; Molecular Sequence Data ; *Nucleic Acid Conformation ; Phosphoric Monoester Hydrolases/metabolism ; Polyphosphates/metabolism ; RNA/chemistry/genetics/*metabolism ; RNA, Double-Stranded/chemistry/genetics/*metabolism ; Transfection ; Vero Cells ; eIF-2 Kinase/*metabolism
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  • 21
    Publication Date: 2007-12-01
    Description: Both limiting and toxic soil concentrations of the essential micronutrient boron represent major limitations to crop production worldwide. We identified Bot1, a BOR1 ortholog, as the gene responsible for the superior boron-toxicity tolerance of the Algerian barley landrace Sahara 3771 (Sahara). Bot1 was located at the tolerance locus by high-resolution mapping. Compared to intolerant genotypes, Sahara contains about four times as many Bot1 gene copies, produces substantially more Bot1 transcript, and encodes a Bot1 protein with a higher capacity to provide tolerance in yeast. Bot1 transcript levels identified in barley tissues are consistent with a role in limiting the net entry of boron into the root and in the disposal of boron from leaves via hydathode guttation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sutton, Tim -- Baumann, Ute -- Hayes, Julie -- Collins, Nicholas C -- Shi, Bu-Jun -- Schnurbusch, Thorsten -- Hay, Alison -- Mayo, Gwenda -- Pallotta, Margaret -- Tester, Mark -- Langridge, Peter -- New York, N.Y. -- Science. 2007 Nov 30;318(5855):1446-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, Private Mail Bag 1, Glen Osmond, South Australia 5064, Australia. tim.sutton@acpfg.com.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18048688" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Biological Transport ; Boron/metabolism/*toxicity ; Boron Compounds/*metabolism/*toxicity ; Chromosome Mapping ; *Genes, Plant ; Hordeum/*drug effects/*genetics/metabolism ; Membrane Transport Proteins/chemistry/*genetics/metabolism ; Molecular Sequence Data ; Plant Lectins/genetics/metabolism ; Plant Proteins/chemistry/genetics/metabolism ; Plant Roots/genetics/metabolism ; Quantitative Trait Loci ; Saccharomyces cerevisiae/genetics/growth & development/metabolism ; Transcription, Genetic
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  • 22
    Publication Date: 2007-05-19
    Description: We present a draft sequence of the genome of Aedes aegypti, the primary vector for yellow fever and dengue fever, which at approximately 1376 million base pairs is about 5 times the size of the genome of the malaria vector Anopheles gambiae. Nearly 50% of the Ae. aegypti genome consists of transposable elements. These contribute to a factor of approximately 4 to 6 increase in average gene length and in sizes of intergenic regions relative to An. gambiae and Drosophila melanogaster. Nonetheless, chromosomal synteny is generally maintained among all three insects, although conservation of orthologous gene order is higher (by a factor of approximately 2) between the mosquito species than between either of them and the fruit fly. An increase in genes encoding odorant binding, cytochrome P450, and cuticle domains relative to An. gambiae suggests that members of these protein families underpin some of the biological differences between the two mosquito species.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2868357/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2868357/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nene, Vishvanath -- Wortman, Jennifer R -- Lawson, Daniel -- Haas, Brian -- Kodira, Chinnappa -- Tu, Zhijian Jake -- Loftus, Brendan -- Xi, Zhiyong -- Megy, Karyn -- Grabherr, Manfred -- Ren, Quinghu -- Zdobnov, Evgeny M -- Lobo, Neil F -- Campbell, Kathryn S -- Brown, Susan E -- Bonaldo, Maria F -- Zhu, Jingsong -- Sinkins, Steven P -- Hogenkamp, David G -- Amedeo, Paolo -- Arensburger, Peter -- Atkinson, Peter W -- Bidwell, Shelby -- Biedler, Jim -- Birney, Ewan -- Bruggner, Robert V -- Costas, Javier -- Coy, Monique R -- Crabtree, Jonathan -- Crawford, Matt -- Debruyn, Becky -- Decaprio, David -- Eiglmeier, Karin -- Eisenstadt, Eric -- El-Dorry, Hamza -- Gelbart, William M -- Gomes, Suely L -- Hammond, Martin -- Hannick, Linda I -- Hogan, James R -- Holmes, Michael H -- Jaffe, David -- Johnston, J Spencer -- Kennedy, Ryan C -- Koo, Hean -- Kravitz, Saul -- Kriventseva, Evgenia V -- Kulp, David -- Labutti, Kurt -- Lee, Eduardo -- Li, Song -- Lovin, Diane D -- Mao, Chunhong -- Mauceli, Evan -- Menck, Carlos F M -- Miller, Jason R -- Montgomery, Philip -- Mori, Akio -- Nascimento, Ana L -- Naveira, Horacio F -- Nusbaum, Chad -- O'leary, Sinead -- Orvis, Joshua -- Pertea, Mihaela -- Quesneville, Hadi -- Reidenbach, Kyanne R -- Rogers, Yu-Hui -- Roth, Charles W -- Schneider, Jennifer R -- Schatz, Michael -- Shumway, Martin -- Stanke, Mario -- Stinson, Eric O -- Tubio, Jose M C -- Vanzee, Janice P -- Verjovski-Almeida, Sergio -- Werner, Doreen -- White, Owen -- Wyder, Stefan -- Zeng, Qiandong -- Zhao, Qi -- Zhao, Yongmei -- Hill, Catherine A -- Raikhel, Alexander S -- Soares, Marcelo B -- Knudson, Dennis L -- Lee, Norman H -- Galagan, James -- Salzberg, Steven L -- Paulsen, Ian T -- Dimopoulos, George -- Collins, Frank H -- Birren, Bruce -- Fraser-Liggett, Claire M -- Severson, David W -- 079059/Wellcome Trust/United Kingdom -- 5 R01 AI61576-2/AI/NIAID NIH HHS/ -- R01 AI059492/AI/NIAID NIH HHS/ -- R01 LM006845/LM/NLM NIH HHS/ -- R01 LM006845-08/LM/NLM NIH HHS/ -- R37 AI024716/AI/NIAID NIH HHS/ -- UO1 AI50936/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2007 Jun 22;316(5832):1718-23. Epub 2007 May 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Genomic Research, 9712 Medical Center Drive, Rockville, MD 20850, USA. nene@tigr.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17510324" target="_blank"〉PubMed〈/a〉
    Keywords: Aedes/*genetics/metabolism ; Animals ; Anopheles gambiae/genetics/metabolism ; Arboviruses ; Base Sequence ; DNA Transposable Elements ; Dengue/prevention & control/transmission ; Drosophila melanogaster/genetics ; Female ; Genes, Insect ; *Genome, Insect ; Humans ; Insect Proteins/genetics ; Insect Vectors/*genetics/metabolism ; Male ; Membrane Transport Proteins/genetics ; Molecular Sequence Data ; Multigene Family ; Protein Structure, Tertiary/genetics ; Sequence Analysis, DNA ; Sex Characteristics ; Sex Determination Processes ; Species Specificity ; Synteny ; Transcription, Genetic ; Yellow Fever/prevention & control/transmission
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  • 23
    Publication Date: 2007-01-27
    Description: A mutualistic association between a fungal endophyte and a tropical panic grass allows both organisms to grow at high soil temperatures. We characterized a virus from this fungus that is involved in the mutualistic interaction. Fungal isolates cured of the virus are unable to confer heat tolerance, but heat tolerance is restored after the virus is reintroduced. The virus-infected fungus confers heat tolerance not only to its native monocot host but also to a eudicot host, which suggests that the underlying mechanism involves pathways conserved between these two groups of plants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marquez, Luis M -- Redman, Regina S -- Rodriguez, Russell J -- Roossinck, Marilyn J -- New York, N.Y. -- Science. 2007 Jan 26;315(5811):513-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Plant Biology Division, Samuel Roberts Noble Foundation, Post Office Box 2180, Ardmore, OK 73402, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17255511" target="_blank"〉PubMed〈/a〉
    Keywords: Ascomycota/growth & development/*physiology/*virology ; Base Sequence ; Hot Temperature ; Lycopersicon esculentum/microbiology/physiology ; Molecular Sequence Data ; Open Reading Frames ; Plant Leaves/metabolism ; Poaceae/growth & development/*microbiology/*physiology ; RNA Viruses/classification/genetics/isolation & purification/*physiology ; RNA, Double-Stranded/genetics/metabolism ; RNA, Viral/genetics/metabolism ; Reactive Oxygen Species/metabolism ; *Symbiosis
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  • 24
    Publication Date: 2007-09-01
    Description: Somatic hypermutation (SHM) is a major means by which diversity is achieved in antibody genes, and it is initiated by the deamination of cytosines to uracils in DNA by activation-induced deaminase (AID). However, the process that leads from these initiating deamination events to mutations at other residues remains poorly understood. We demonstrate that a single cytosine on the top (nontemplate) strand is sufficient to recruit AID and lead to mutations of upstream and downstream A/T residues. In contrast, the targeting of cytosines on the bottom strand by AID does not lead to substantial mutation of neighboring residues. This strand asymmetry is eliminated in mice deficient in mismatch repair, indicating that the error-prone mismatch repair machinery preferentially targets top-strand uracils in a way that promotes SHM during the antibody response.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Unniraman, Shyam -- Schatz, David G -- New York, N.Y. -- Science. 2007 Aug 31;317(5842):1227-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06511, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17761884" target="_blank"〉PubMed〈/a〉
    Keywords: Adenine/metabolism ; Animals ; B-Lymphocytes ; Base Sequence ; Cytidine Deaminase/*metabolism ; Cytosine/*metabolism ; DNA Mismatch Repair ; Deamination ; *Genes, Immunoglobulin ; Immunoglobulin Variable Region/genetics ; Immunoglobulin kappa-Chains/genetics ; Mice ; Mice, Transgenic ; Molecular Sequence Data ; *Somatic Hypermutation, Immunoglobulin ; Thymine/metabolism ; Transgenes ; Uracil/metabolism
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  • 25
    Publication Date: 2007-02-10
    Description: Zhang et al. (Research Articles, 11 November 2005, p. 996) reported that obestatin, a peptide derived from the ghrelin precursor, activated the orphan G protein-coupled receptor GPR39. However, we found that I125-obestatin does not bind GPR39 and observed no effects of obestatin on GPR39-transfected cells in various functional assays (cyclic adenosine monophosphate production, calcium mobilization, and GPR39 internalization). Our results indicate that obestatin is not the cognate ligand for GPR39.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chartrel, N -- Alvear-Perez, R -- Leprince, J -- Iturrioz, X -- Reaux-Le Goazigo, A -- Audinot, V -- Chomarat, P -- Coge, F -- Nosjean, O -- Rodriguez, M -- Galizzi, J P -- Boutin, J A -- Vaudry, H -- Llorens-Cortes, C -- New York, N.Y. -- Science. 2007 Feb 9;315(5813):766; author reply 766.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut National de la Sante et de la Recherche Medicale (INSERM), U413, Laboratory of Cellular and Molecular Neuroendocrinology, and European Institute for Peptide Research (IFRMP 23), University of Rouen, 76821 Mont-Saint-Aignan, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17289961" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; CHO Cells ; Calcium/metabolism ; Cell Membrane/metabolism ; Colforsin/pharmacology ; Cricetinae ; Cricetulus ; Cyclic AMP/metabolism ; Ghrelin ; Humans ; Ligands ; Molecular Sequence Data ; Peptide Hormones/genetics/*metabolism/pharmacology ; Pituitary Gland/cytology/metabolism ; Protein Binding ; Receptors, G-Protein-Coupled/genetics/*metabolism ; Transfection
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  • 26
    Publication Date: 2007-01-06
    Description: Dendritic cells (DCs) process and present self and foreign antigens to induce tolerance or immunity. In vitro models suggest that induction of immunity is controlled by regulating the presentation of antigen, but little is known about how DCs control antigen presentation in vivo. To examine antigen processing and presentation in vivo, we specifically targeted antigens to two major subsets of DCs by using chimeric monoclonal antibodies. Unlike CD8+ DCs that express the cell surface protein CD205, CD8- DCs, which are positive for the 33D1 antigen, are specialized for presentation on major histocompatibility complex (MHC) class II. This difference in antigen processing is intrinsic to the DC subsets and is associated with increased expression of proteins involved in MHC processing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dudziak, Diana -- Kamphorst, Alice O -- Heidkamp, Gordon F -- Buchholz, Veit R -- Trumpfheller, Christine -- Yamazaki, Sayuri -- Cheong, Cheolho -- Liu, Kang -- Lee, Han-Woong -- Park, Chae Gyu -- Steinman, Ralph M -- Nussenzweig, Michel C -- New York, N.Y. -- Science. 2007 Jan 5;315(5808):107-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Immunology, The Rockefeller University, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17204652" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Monoclonal/immunology ; *Antigen Presentation ; Antigens, CD/analysis/immunology ; Antigens, CD8/analysis/immunology ; Base Sequence ; Dendritic Cells/*immunology ; Histocompatibility Antigens Class I/immunology ; Histocompatibility Antigens Class II/immunology ; Lectins, C-Type/analysis/immunology ; Lymphocyte Activation ; Mice ; Mice, Inbred C3H ; Mice, Inbred C57BL ; Mice, Transgenic ; Molecular Sequence Data ; Oligonucleotide Array Sequence Analysis ; Receptors, Cell Surface/analysis/immunology ; T-Lymphocytes/immunology
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