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  • Articles  (40)
  • Springer Nature  (30)
  • American Association for the Advancement of Science (AAAS)  (10)
  • Periodicals Archive Online (PAO)
  • 2000-2004  (40)
  • Natural Sciences in General  (40)
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  • Articles  (40)
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  • 1
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    Localization of the G protein betagamma complex in living cells during chemotaxis (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-02-11
    Description: Gradients of chemoattractants elicit signaling events at the leading edge of a cell even though chemoattractant receptors are uniformly distributed on the cell surface. In highly polarized Dictyostelium discoideum amoebas, membrane-associated betagamma subunits of heterotrimeric guanine nucleotide-binding proteins (G proteins) were localized in a shallow anterior-posterior gradient. A uniformly applied chemoattractant generated binding sites for pleckstrin homology (PH) domains on the inner surface of the membrane in a pattern similar to that of the Gbetagamma subunits. Loss of cell polarity resulted in uniform distribution of both the Gbetagamma subunits and the sensitivity of PH domain recruitment. These observations indicate that Gbetagamma subunits are not sufficiently localized to restrict signaling events to the leading edge but that their distribution may determine the relative chemotactic sensitivity of polarized cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jin, T -- Zhang, N -- Long, Y -- Parent, C A -- Devreotes, P N -- GM-28007/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Feb 11;287(5455):1034-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, 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/10669414" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Binding Sites ; Cell Membrane/metabolism ; Cell Polarity ; Chemotactic Factors/pharmacology ; Chemotaxis/*physiology ; Cyclic AMP/pharmacology ; Dictyostelium/metabolism/*physiology ; *GTP-Binding Protein beta Subunits ; *GTP-Binding Protein gamma Subunits ; GTP-Binding Proteins/*metabolism ; *Heterotrimeric GTP-Binding Proteins ; Recombinant Fusion Proteins/metabolism ; Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    Gene duplication and evolution (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Long, M -- Thornton, K -- New York, N.Y. -- Science. 2001 Aug 31;293(5535):1551.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolution, University of Chicago, 1101 East 57th Street, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11533445" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Caenorhabditis elegans/genetics ; Drosophila melanogaster/genetics ; *Evolution, Molecular ; Gene Duplication ; Gene Silencing ; *Genes, Duplicate ; Genome ; Half-Life ; Saccharomyces cerevisiae/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    The composite genome of the legume symbiont Sinorhizobium meliloti (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-07-28
    Description: The scarcity of usable nitrogen frequently limits plant growth. A tight metabolic association with rhizobial bacteria allows legumes to obtain nitrogen compounds by bacterial reduction of dinitrogen (N2) to ammonium (NH4+). We present here the annotated DNA sequence of the alpha-proteobacterium Sinorhizobium meliloti, the symbiont of alfalfa. The tripartite 6.7-megabase (Mb) genome comprises a 3.65-Mb chromosome, and 1.35-Mb pSymA and 1.68-Mb pSymB megaplasmids. Genome sequence analysis indicates that all three elements contribute, in varying degrees, to symbiosis and reveals how this genome may have emerged during evolution. The genome sequence will be useful in understanding the dynamics of interkingdom associations and of life in soil environments.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Galibert, F -- Finan, T M -- Long, S R -- Puhler, A -- Abola, P -- Ampe, F -- Barloy-Hubler, F -- Barnett, M J -- Becker, A -- Boistard, P -- Bothe, G -- Boutry, M -- Bowser, L -- Buhrmester, J -- Cadieu, E -- Capela, D -- Chain, P -- Cowie, A -- Davis, R W -- Dreano, S -- Federspiel, N A -- Fisher, R F -- Gloux, S -- Godrie, T -- Goffeau, A -- Golding, B -- Gouzy, J -- Gurjal, M -- Hernandez-Lucas, I -- Hong, A -- Huizar, L -- Hyman, R W -- Jones, T -- Kahn, D -- Kahn, M L -- Kalman, S -- Keating, D H -- Kiss, E -- Komp, C -- Lelaure, V -- Masuy, D -- Palm, C -- Peck, M C -- Pohl, T M -- Portetelle, D -- Purnelle, B -- Ramsperger, U -- Surzycki, R -- Thebault, P -- Vandenbol, M -- Vorholter, F J -- Weidner, S -- Wells, D H -- Wong, K -- Yeh, K C -- Batut, J -- GM30962/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Jul 27;293(5530):668-72.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉UMR6061-CNRS, Laboratoire de Genetique et Developpement, Faculte de Medecine, 2 avenue du Pr. Leon Bernard, F-35043 Rennes cedex, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11474104" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Adhesion ; Bacterial Proteins/genetics ; Carrier Proteins/genetics ; Chromosomes, Bacterial/genetics ; Computational Biology ; DNA Transposable Elements ; Energy Metabolism/genetics ; Evolution, Molecular ; Gene Duplication ; Genes, Bacterial ; Genes, Essential ; Genes, Regulator ; *Genome, Bacterial ; Medicago sativa/microbiology ; Nitrogen/metabolism ; Nitrogen Fixation/genetics ; Plasmids ; Polysaccharides, Bacterial/genetics ; Replicon ; Rhizobiaceae/genetics ; *Sequence Analysis, DNA ; Sinorhizobium meliloti/*genetics/physiology ; Symbiosis/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Parasitology. Malaria--from infants to genomics to vaccines (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-07-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Long, Carole A -- Hoffman, Stephen L -- New York, N.Y. -- Science. 2002 Jul 19;297(5580):345-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Malaria Vaccine Development Unit, National Institutes of Health, Rockville, MD 20852, USA. clong@niaid.nih.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12130768" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Protozoan/immunology ; Antigens, Protozoan/immunology ; B-Lymphocytes/immunology ; Clinical Trials, Phase II as Topic ; Genes, Protozoan ; Genomics ; Host-Parasite Interactions ; Humans ; *Malaria/epidemiology/immunology/parasitology/prevention & control ; *Malaria Vaccines/immunology ; *Malaria, Falciparum/epidemiology/immunology/parasitology/prevention & control ; *Plasmodium/genetics/immunology/physiology ; *Plasmodium falciparum/immunology/physiology ; Proteome ; T-Lymphocytes/immunology
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Group II introns designed to insert into therapeutically relevant DNA target sites in human cells (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-07-21
    Description: Mobile group II intron RNAs insert directly into DNA target sites and are then reverse-transcribed into genomic DNA by the associated intron-encoded protein. Target site recognition involves modifiable base-pairing interactions between the intron RNA and a 〉14-nucleotide region of the DNA target site, as well as fixed interactions between the protein and flanking regions. Here, we developed a highly efficient Escherichia coli genetic assay to determine detailed target site recognition rules for the Lactococcus lactis group II intron Ll.LtrB and to select introns that insert into desired target sites. Using human immunodeficiency virus-type 1 (HIV-1) proviral DNA and the human CCR5 gene as examples, we show that group II introns can be retargeted to insert efficiently into virtually any target DNA and that the retargeted introns retain activity in human cells. This work provides the practical basis for potential applications of targeted group II introns in genetic engineering, functional genomics, and gene therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Guo, H -- Karberg, M -- Long, M -- Jones, J P 3rd -- Sullenger, B -- Lambowitz, A M -- AI40981/AI/NIAID NIH HHS/ -- GM37949/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Jul 21;289(5478):452-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Cellular and Molecular Biology, Department of Chemistry and Biochemistry, and Section of Molecular Genetics and Microbiology, School of Biological Sciences, University of Texas, Austin, TX 78712, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10903206" target="_blank"〉PubMed〈/a〉
    Keywords: Base Pairing ; Base Sequence ; Cell Line ; DNA/*genetics ; DNA, Viral/genetics ; Escherichia coli/genetics ; *Gene Targeting ; Genes, pol ; Genetic Therapy ; HIV-1/genetics ; Humans ; *Introns ; Lactococcus lactis/genetics ; Molecular Sequence Data ; Proviruses/genetics ; RNA, Catalytic/*genetics ; Receptors, CCR5/genetics ; Recombination, Genetic ; Transfection
    Print ISSN: 0036-8075
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  • 6
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    Deposition of conformal copper and nickel films from supercritical carbon dioxide (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-15
    Description: Device-quality copper and nickel films were deposited onto planar and etched silicon substrates by the reduction of soluble organometallic compounds with hydrogen in a supercritical carbon dioxide solution. Exceptional step coverage on complex surfaces and complete filling of high-aspect-ratio features of less than 100 nanometers width were achieved. Nickel was deposited at 60 degrees C by the reduction of bis(cyclopentadienyl)nickel and copper was deposited from either copper(I) or copper(II) compounds onto the native oxide of silicon or metal nitrides with seed layers at temperatures up to 200 degrees C and directly on each surface at temperatures above 250 degrees C. The latter approach provides a single-step means for achieving high-aspect-ratio feature fill necessary for copper interconnect structures in future generations of integrated circuits.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Blackburn, J M -- Long, D P -- Cabanas, A -- Watkins, J J -- New York, N.Y. -- Science. 2001 Oct 5;294(5540):141-5. Epub 2001 Sep 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical Engineering, University of Massachusetts, Amherst, MA 01003, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11557842" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 7
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    Nucleotide variation along the Drosophila melanogaster fourth chromosome (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-01-05
    Description: The Drosophila melanogaster fourth chromosome, believed to be nonrecombining and invariable, is a classic example of the effect of natural selection in eliminating genetic variation in linked loci. However, in a chromosome-wide assay of nucleotide variation in natural populations, we have observed a high level of polymorphism in a approximately 200-kilobase region and marked levels of polymorphism in several other fragments interspersed with regions of little variation, suggesting different evolutionary histories in different chromosomal domains. Statistical tests of neutral evolution showed that a few haplotypes predominate in the 200-kilobase polymorphic region. Finally, contrary to the expectation of no recombination, we identified six recombination events within the chromosome. Thus, positive Darwinian selection and recombination have affected the evolution of this chromosome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Wen -- Thornton, Kevin -- Berry, Andrew -- Long, Manyuan -- New York, N.Y. -- Science. 2002 Jan 4;295(5552):134-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolution, Committee on Genetics, University of Chicago, 1101 East 57 Street, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11778050" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Pairing ; Chromosome Inversion ; Chromosomes/*genetics ; Drosophila Proteins/genetics ; Drosophila melanogaster/*genetics ; Evolution, Molecular ; *Genes, Insect ; *Genetic Variation ; Haplotypes ; Introns ; Linkage Disequilibrium ; Monte Carlo Method ; Mutation ; Nucleotides/genetics ; *Polymorphism, Genetic ; *Recombination, Genetic ; Selection, Genetic ; Sequence Analysis, DNA ; Trans-Activators/genetics
    Print ISSN: 0036-8075
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  • 8
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    Extensive gene traffic on the mammalian X chromosome (2004)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2004-01-24
    Description: Mammalian sex chromosomes have undergone profound changes since evolving from ancestral autosomes. By examining retroposed genes in the human and mouse genomes, we demonstrate that, during evolution, the mammalian X chromosome has generated and recruited a disproportionately high number of functional retroposed genes, whereas the autosomes experienced lower gene turnover. Most autosomal copies originating from X-linked genes exhibited testis-biased expression. Such export is incompatible with mutational bias and is likely driven by natural selection to attain male germline function. However, the excess recruitment is consistent with a combination of both natural selection and mutational bias.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Emerson, J J -- Kaessmann, Henrik -- Betran, Esther -- Long, Manyuan -- GM-065429-01A1/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2004 Jan 23;303(5657):537-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolution, University of Chicago, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14739461" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Chromosomes, Human/genetics ; Chromosomes, Human, X/*genetics ; Chromosomes, Mammalian/genetics ; Computational Biology ; Dosage Compensation, Genetic ; Female ; Gene Expression Profiling ; Genes, Duplicate ; Genetic Linkage ; Genome ; Genome, Human ; Humans ; Introns ; Male ; Mice ; Monte Carlo Method ; Mutation ; Oligonucleotide Array Sequence Analysis ; Ovary/metabolism ; Pseudogenes/*genetics ; *Recombination, Genetic ; Retroelements/*genetics ; Selection, Genetic ; Sex Characteristics ; Testis/metabolism ; X Chromosome/*genetics
    Print ISSN: 0036-8075
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  • 9
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    Comment on " 'Stemness': transcriptional profiling of embryonic and adult stem cells" and "a stem cell molecular signature" (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-10-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fortunel, Nicolas O -- Otu, Hasan H -- Ng, Huck-Hui -- Chen, Jinhui -- Mu, Xiuqian -- Chevassut, Timothy -- Li, Xiaoyu -- Joseph, Marie -- Bailey, Charles -- Hatzfeld, Jacques A -- Hatzfeld, Antoinette -- Usta, Fatih -- Vega, Vinsensius B -- Long, Philip M -- Libermann, Towia A -- Lim, Bing -- New York, N.Y. -- Science. 2003 Oct 17;302(5644):393; author reply 393.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14563990" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Differentiation ; Cell Lineage ; Embryo, Mammalian/*cytology ; *Embryo, Nonmammalian ; *Gene Expression ; Gene Expression Profiling ; Genes ; Hematopoietic Stem Cells/physiology ; Integrin alpha6/genetics ; Neurons/*cytology ; Oligonucleotide Array Sequence Analysis ; Retina/*cytology ; Stem Cells/*physiology ; *Transcription, Genetic
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Medicago truncatula DMI1 required for bacterial and fungal symbioses in legumes (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-02-14
    Description: Legumes form symbiotic associations with both mycorrhizal fungi and nitrogen-fixing soil bacteria called rhizobia. Several of the plant genes required for transduction of rhizobial signals, the Nod factors, are also necessary for mycorrhizal symbiosis. Here, we describe the cloning and characterization of one such gene from the legume Medicago truncatula. The DMI1 (does not make infections) gene encodes a novel protein with low global similarity to a ligand-gated cation channel domain of archaea. The protein is highly conserved in angiosperms and ancestral to land plants. We suggest that DMI1 represents an ancient plant-specific innovation, potentially enabling mycorrhizal associations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ane, Jean-Michel -- Kiss, Gyorgy B -- Riely, Brendan K -- Penmetsa, R Varma -- Oldroyd, Giles E D -- Ayax, Celine -- Levy, Julien -- Debelle, Frederic -- Baek, Jong-Min -- Kalo, Peter -- Rosenberg, Charles -- Roe, Bruce A -- Long, Sharon R -- Denarie, Jean -- Cook, Douglas R -- New York, N.Y. -- Science. 2004 Feb 27;303(5662):1364-7. Epub 2004 Feb 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Pathology, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14963334" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Amino Acid Sequence ; Arabidopsis/genetics ; Chromosomes, Artificial, Bacterial ; Cloning, Molecular ; Fabaceae/genetics/metabolism/microbiology ; Gene Expression Regulation, Plant ; *Genes, Plant ; Lipopolysaccharides/metabolism ; Medicago/*genetics/metabolism/*microbiology ; Molecular Sequence Data ; Mycorrhizae/*physiology ; Nitrogen Fixation ; Phylogeny ; Plant Proteins/chemistry/genetics/*physiology ; Plant Roots/metabolism ; Protein Structure, Tertiary ; Recombination, Genetic ; Rhizobiaceae/*physiology ; Sequence Homology, Amino Acid ; Signal Transduction ; *Symbiosis ; Transgenes
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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