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  • American Association for the Advancement of Science  (95)
  • American Association for the Advancement of Science (AAAS)
  • 1
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    Derepression of BDNF transcription involves calcium-dependent phosphorylation of MeCP2 (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-11-01
    Description: Mutations in MeCP2, which encodes a protein that has been proposed to function as a global transcriptional repressor, are the cause of Rett syndrome (RT T), an X-linked progressive neurological disorder. Although the selective inactivation of MeCP2 in neurons is sufficient to confer a Rett-like phenotype in mice, the specific functions of MeCP2 in postmitotic neurons are not known. We find that MeCP2 binds selectively to BDNF promoter III and functions to repress expression of the BDNF gene. Membrane depolarization triggers the calcium-dependent phosphorylation and release of MeCP2 from BDNF promoter III, thereby facilitating transcription. These studies indicate that MeCP2 plays a key role in the control of neuronal activity-dependent gene regulation and suggest that the deregulation of this process may underlie the pathology of RT T.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Wen G -- Chang, Qiang -- Lin, Yingxi -- Meissner, Alexander -- West, Anne E -- Griffith, Eric C -- Jaenisch, Rudolf -- Greenberg, Michael E -- HD 18655/HD/NICHD NIH HHS/ -- NS28829/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2003 Oct 31;302(5646):885-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Neuroscience, Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14593183" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain-Derived Neurotrophic Factor/*genetics ; Calcium/*metabolism ; Cell Membrane/physiology ; Cells, Cultured ; *Chromosomal Proteins, Non-Histone ; Cloning, Molecular ; CpG Islands ; DNA Methylation ; DNA-Binding Proteins/*metabolism ; Electrophoretic Mobility Shift Assay ; *Gene Expression Regulation ; Gene Silencing ; Histones/metabolism ; Methyl-CpG-Binding Protein 2 ; Methylation ; Mice ; Mice, Knockout ; Neurons/metabolism/physiology ; Phosphorylation ; Potassium Chloride/pharmacology ; Precipitin Tests ; Promoter Regions, Genetic ; Rats ; *Repressor Proteins ; Rett Syndrome/genetics ; *Transcription, Genetic
    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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    The dusty atmosphere of the brown dwarf Gliese 229B (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-12-16
    Description: The brown dwarf Gliese 229B has an observable atmosphere too warm to contain ice clouds like those on Jupiter and too cool to contain silicate clouds like those on low-mass stars. These unique conditions permit visibility to higher pressures than possible in cool stars or planets. Gliese 229B's 0.85- to 1.0-micrometer spectrum indicates particulates deep in the atmosphere (10 to 50 bars) having optical properties of neither ice nor silicates. Their reddish color suggests an organic composition characteristic of aerosols in planetary stratospheres. The particles' mass fraction (10(-7)) agrees with a photochemical origin caused by incident radiation from the primary star and suggests the occurrence of processes native to planetary stratospheres.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Griffith, C A -- Yelle, R V -- Marley, M S -- New York, N.Y. -- Science. 1998 Dec 11;282(5396):2063-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ 86011-6010, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9851924" target="_blank"〉PubMed〈/a〉
    Keywords: Astronomical Phenomena ; *Astronomy ; Atmosphere ; *Extraterrestrial Environment ; Organic Chemicals/*analysis ; Temperature ; Ultraviolet Rays
    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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    Detection of daily clouds on Titan (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-10-20
    Description: We have discovered frequent variations in the near-infrared spectrum of Titan, Saturn's largest moon, which are indicative of the daily presence of sparse clouds covering less than 1% of the area of the satellite. The thermodynamics of Titan's atmosphere and the clouds' altitudes suggest that convection governs their evolutions. Their short lives point to the presence of rain. We propose that Titan's atmosphere resembles Earth's, with clouds, rain, and an active weather cycle, driven by latent heat release from the primary condensible species.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Griffith, C A -- Hall, J L -- Geballe, T R -- New York, N.Y. -- Science. 2000 Oct 20;290(5491):509-13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ 86011-6010, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11039930" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; *Extraterrestrial Environment ; Methane ; Rain ; *Saturn ; Spectrum Analysis ; Sunlight ; Temperature ; Thermodynamics ; Water
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    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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    Cooperation of GGAs and AP-1 in packaging MPRs at the trans-Golgi network (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-09-07
    Description: The Golgi-localized, gamma-ear-containing, adenosine diphosphate ribosylation factor-binding proteins (GGAs) are multidomain proteins that bind mannose 6-phosphate receptors (MPRs) in the Golgi and have an essential role in lysosomal enzyme sorting. Here the GGAs and the coat protein adaptor protein-1 (AP-1) were shown to colocalize in clathrin-coated buds of the trans-Golgi networks of mouse L cells and human HeLa cells. Binding studies revealed a direct interaction between the hinge domains of the GGAs and the gamma-ear domain of AP-1. Further, AP-1 contained bound casein kinase-2 that phosphorylated GGA1 and GGA3, thereby causing autoinhibition. This could induce the directed transfer of the MPRs from GGAs to AP-1. MPRs that are defective in binding to GGAs are poorly incorporated into AP-1-containing clathrin-coated vesicles. Thus, the GGAs and AP-1 interact to package MPRs into AP-1-containing coated vesicles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Doray, Balraj -- Ghosh, Pradipta -- Griffith, Janice -- Geuze, Hans J -- Kornfeld, Stuart -- R01 CA-08759/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2002 Sep 6;297(5587):1700-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Internal Medicine, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12215646" target="_blank"〉PubMed〈/a〉
    Keywords: ADP-Ribosylation Factors/*metabolism ; Adaptor Proteins, Vesicular Transport ; Animals ; Biological Transport ; Carrier Proteins/*metabolism ; Cattle ; Cell Line ; Clathrin-Coated Vesicles/metabolism ; HeLa Cells ; Humans ; L Cells (Cell Line) ; Membrane Proteins/*metabolism ; Mice ; Mutation ; Phosphorylation ; Protein Binding ; Receptor, IGF Type 2/genetics/*metabolism ; Recombinant Proteins/metabolism ; trans-Golgi Network/*metabolism
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  • 5
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    Functional human corneal equivalents constructed from cell lines (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-11
    Description: Human corneal equivalents comprising the three main layers of the cornea (epithelium, stroma, and endothelium) were constructed. Each cellular layer was fabricated from immortalized human corneal cells that were screened for use on the basis of morphological, biochemical, and electrophysiological similarity to their natural counterparts. The resulting corneal equivalents mimicked human corneas in key physical and physiological functions, including morphology, biochemical marker expression, transparency, ion and fluid transport, and gene expression. Morphological and functional equivalents to human corneas that can be produced in vitro have immediate applications in toxicity and drug efficacy testing, and form the basis for future development of implantable tissues.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Griffith, M -- Osborne, R -- Munger, R -- Xiong, X -- Doillon, C J -- Laycock, N L -- Hakim, M -- Song, Y -- Watsky, M A -- New York, N.Y. -- Science. 1999 Dec 10;286(5447):2169-72.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Ottawa Eye Institute and Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa Hospital-General Campus, Ottawa, Ontario K1H 8L6, Canada. mgriffith@ogh.on.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10591651" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Testing Alternatives ; *Biomedical Engineering ; Cell Line ; Cells, Cultured ; Chondroitin Sulfates ; Collagen ; *Cornea/cytology/growth & development/physiology ; Corneal Opacity/chemically induced ; Corneal Stroma/cytology/growth & development/physiology ; Corneal Transplantation ; Cross-Linking Reagents ; *Culture Techniques ; Electrophysiology ; Endothelium, Corneal/cytology/growth & development ; Epithelium, Corneal/cytology/growth & development ; Gene Expression ; Glutaral ; Humans ; Ion Channels ; Ouabain/pharmacology ; Patch-Clamp Techniques ; Sodium Dodecyl Sulfate/pharmacology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Tissue engineering--current challenges and expanding opportunities (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-02-09
    Description: Tissue engineering can be used to restore, maintain, or enhance tissues and organs. The potential impact of this field, however, is far broader-in the future, engineered tissues could reduce the need for organ replacement, and could greatly accelerate the development of new drugs that may cure patients, eliminating the need for organ transplants altogether.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Griffith, Linda G -- Naughton, Gail -- New York, N.Y. -- Science. 2002 Feb 8;295(5557):1009-14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical Engineering, Division of Bioengineering and Environmental Health, and Biotechnology Process Engineering Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. griff@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11834815" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biocompatible Materials ; Bioreactors ; Blood Vessels/physiology ; Cell Culture Techniques ; Cell Differentiation ; Culture Techniques ; Embryo, Mammalian/cytology ; Humans ; Models, Biological ; Neovascularization, Physiologic ; Skin Transplantation ; Stem Cells/physiology ; *Tissue Engineering/instrumentation/methods
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Regulatory phosphorylation of AMPA-type glutamate receptors by CaM-KII during long-term potentiation (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-06-27
    Description: Long-term potentiation (LTP), a cellular model of learning and memory, requires calcium-dependent protein kinases. Induction of LTP increased the phosphorus-32 labeling of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA)-type glutamate receptors (AMPA-Rs), which mediate rapid excitatory synaptic transmission. This AMPA-R phosphorylation appeared to be catalyzed by Ca2+- and calmodulin-dependent protein kinase II (CaM-KII): (i) it correlated with the activation and autophosphorylation of CaM-KII, (ii) it was blocked by the CaM-KII inhibitor KN-62, and (iii) its phosphorus-32 peptide map was the same as that of GluR1 coexpressed with activated CaM-KII in HEK-293 cells. This covalent modulation of AMPA-Rs in LTP provides a postsynaptic molecular mechanism for synaptic plasticity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barria, A -- Muller, D -- Derkach, V -- Griffith, L C -- Soderling, T R -- NS27037/NS/NINDS NIH HHS/ -- R01 GM054408/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1997 Jun 27;276(5321):2042-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Vollum Institute, Oregon Health Sciences University, Portland, OR 97201, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9197267" target="_blank"〉PubMed〈/a〉
    Keywords: 1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine/analogs & derivatives/pharmacology ; 2-Amino-5-phosphonovalerate/pharmacology ; Animals ; Calcium/metabolism ; Calcium-Calmodulin-Dependent Protein Kinase Type 2 ; Calcium-Calmodulin-Dependent Protein Kinases/antagonists & inhibitors/*metabolism ; Cell Line ; Enzyme Inhibitors/pharmacology ; Excitatory Amino Acid Antagonists/pharmacology ; Hippocampus/*metabolism ; Humans ; In Vitro Techniques ; *Long-Term Potentiation/drug effects ; Male ; Peptide Mapping ; Phosphorylation ; Rats ; Rats, Sprague-Dawley ; Receptors, AMPA/*metabolism ; Synaptic Transmission/drug effects
    Print ISSN: 0036-8075
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  • 8
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    Translocation as a species conservation tool: status and strategy (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-08-04
    Description: Surveys of recent (1973 to 1986) intentional releases of native birds and mammals to the wild in Australia, Canada, Hawaii, New Zealand, and the United States were conducted to document current activities, identify factors associated with success, and suggest guidelines for enhancing future work. Nearly 700 translocations were conducted each year. Native game species constituted 90 percent of translocations and were more successful (86 percent) than were translocations of threatened, endangered, or sensitive species (46 percent). Knowledge of habitat quality, location of release area within the species range, number of animals released, program length, and reproductive traits allowed correct classification of 81 percent of observed translocations as successful or not.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Griffith, B -- Scott, J M -- Carpenter, J W -- Reed, C -- New York, N.Y. -- Science. 1989 Aug 4;245(4917):477-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17750257" target="_blank"〉PubMed〈/a〉
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    A general method for site-specific incorporation of unnatural amino acids into proteins (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-04-14
    Description: A new method has been developed that makes it possible to site-specifically incorporate unnatural amino acids into proteins. Synthetic amino acids were incorporated into the enzyme beta-lactamase by the use of a chemically acylated suppressor transfer RNA that inserted the amino acid in response to a stop codon substituted for the codon encoding residue of interest. Peptide mapping localized the inserted amino acid to a single peptide, and enough enzyme could be generated for purification to homogeneity. The catalytic properties of several mutants at the conserved Phe66 were characterized. The ability to selectively replace amino acids in a protein with a wide variety of structural and electronic variants should provide a more detailed understanding of protein structure and function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Noren, C J -- Anthony-Cahill, S J -- Griffith, M C -- Schultz, P G -- New York, N.Y. -- Science. 1989 Apr 14;244(4901):182-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2649980" target="_blank"〉PubMed〈/a〉
    Keywords: *Amino Acids ; Electrophoresis, Polyacrylamide Gel ; Escherichia coli/enzymology ; Mutation ; Protein Biosynthesis ; *Proteins ; RNA, Transfer/isolation & purification ; beta-Lactamases
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  • 10
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    Exploiting the reversibility of natural product glycosyltransferase-catalyzed reactions (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-09-02
    Description: Glycosyltransferases (GTs), an essential class of ubiquitous enzymes, are generally perceived as unidirectional catalysts. In contrast, we report that four glycosyltransferases from two distinct natural product biosynthetic pathways-calicheamicin and vancomycin-readily catalyze reversible reactions, allowing sugars and aglycons to be exchanged with ease. As proof of the broader applicability of these new reactions, more than 70 differentially glycosylated calicheamicin and vancomycin variants are reported. This study suggests the reversibility of GT-catalyzed reactions may be general and useful for generating exotic nucleotide sugars, establishing in vitro GT activity in complex systems, and enhancing natural product diversity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Changsheng -- Griffith, Byron R -- Fu, Qiang -- Albermann, Christoph -- Fu, Xun -- Lee, In-Kyoung -- Li, Lingjun -- Thorson, Jon S -- AI52218/AI/NIAID NIH HHS/ -- CA84374/CA/NCI NIH HHS/ -- GM70637/GM/NIGMS NIH HHS/ -- U19 CA113297/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2006 Sep 1;313(5791):1291-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory for Biosynthetic Chemistry, Pharmaceutical Sciences Division, School of Pharmacy, National Cooperative Drug Discovery Group Program, University of Wisconsin (UW)-Madison, 777 Highland Avenue, Madison, WI 53705-2222, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16946071" target="_blank"〉PubMed〈/a〉
    Keywords: Aminoglycosides/biosynthesis/chemistry/*metabolism ; Carbohydrate Sequence ; Catalysis ; Enediynes ; Glucosyltransferases/*metabolism ; Glycosylation ; Glycosyltransferases/genetics/*metabolism ; Micromonospora/enzymology/genetics ; Molecular Sequence Data ; Molecular Structure ; Nucleoside Diphosphate Sugars/metabolism ; Pentoses/metabolism ; Thymine Nucleotides/metabolism ; Vancomycin/*analogs & derivatives/biosynthesis/chemistry/metabolism
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