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  • Mutation  (11)
  • American Association for the Advancement of Science (AAAS)  (11)
  • American Physical Society (APS)
  • American Geophysical Union (AGU)
  • 2005-2009  (11)
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Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (11)
  • American Physical Society (APS)
  • American Geophysical Union (AGU)
  • Nature Publishing Group (NPG)  (1)
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  • 1
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    Priming in systemic plant immunity (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-04-04
    Description: Plants possess inducible systemic defense responses when locally infected by pathogens. Bacterial infection results in the increased accumulation of the mobile metabolite azelaic acid, a nine-carbon dicarboxylic acid, in the vascular sap of Arabidopsis that confers local and systemic resistance against the pathogen Pseudomonas syringae. Azelaic acid primes plants to accumulate salicylic acid (SA), a known defense signal, upon infection. Mutation of the AZELAIC ACID INDUCED 1 (AZI1) gene, which is induced by azelaic acid, results in the specific loss of systemic immunity triggered by pathogen or azelaic acid and of the priming of SA induction in plants. Furthermore, the predicted secreted protein AZI1 is also important for generating vascular sap that confers disease resistance. Thus, azelaic acid and AZI1 are components of plant systemic immunity involved in priming defenses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jung, Ho Won -- Tschaplinski, Timothy J -- Wang, Lin -- Glazebrook, Jane -- Greenberg, Jean T -- New York, N.Y. -- Science. 2009 Apr 3;324(5923):89-91. doi: 10.1126/science.1170025.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Genetics and Cell Biology, University of Chicago, 1103 East 57th Street EBC410, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19342588" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/genetics/*immunology/metabolism/*microbiology ; Arabidopsis Proteins/*genetics/physiology ; Dicarboxylic Acids/*metabolism/pharmacology ; Gene Expression Regulation, Plant ; *Genes, Plant ; Immunity, Innate ; Mutation ; Oligonucleotide Array Sequence Analysis ; Plant Diseases/*immunology ; Plant Leaves/immunology/metabolism ; Pseudomonas syringae/growth & development/*immunology/pathogenicity ; Salicylic Acid/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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    Structure and function of an essential component of the outer membrane protein assembly machine (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-08-19
    Description: Integral beta-barrel proteins are found in the outer membranes of mitochondria, chloroplasts, and Gram-negative bacteria. The machine that assembles these proteins contains an integral membrane protein, called YaeT in Escherichia coli, which has one or more polypeptide transport-associated (POTRA) domains. The crystal structure of a periplasmic fragment of YaeT reveals the POTRA domain fold and suggests a model for how POTRA domains can bind different peptide sequences, as required for a machine that handles numerous beta-barrel protein precursors. Analysis of POTRA domain deletions shows which are essential and provides a view of the spatial organization of this assembly machine.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, Seokhee -- Malinverni, Juliana C -- Sliz, Piotr -- Silhavy, Thomas J -- Harrison, Stephen C -- Kahne, Daniel -- GM34821/GM/NIGMS NIH HHS/ -- GM66174/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2007 Aug 17;317(5840):961-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17702946" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacterial Outer Membrane Proteins/*chemistry/genetics/*metabolism ; Cell Membrane/metabolism ; Crystallography, X-Ray ; Dimerization ; Escherichia coli/*chemistry/*metabolism ; Escherichia coli Proteins/*chemistry/genetics/*metabolism ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Lipoproteins/chemistry/metabolism ; Models, Biological ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Protein Binding ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Transport
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  • 3
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    Alternative zippering as an on-off switch for SNARE-mediated fusion (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-01-24
    Description: Membrane fusion between vesicles and target membranes involves the zippering of a four-helix bundle generated by constituent helices derived from target- and vesicle-soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs). In neurons, the protein complexin clamps otherwise spontaneous fusion by SNARE proteins, allowing neurotransmitters and other mediators to be secreted when and where they are needed as this clamp is released. The membrane-proximal accessory helix of complexin is necessary for clamping, but its mechanism of action is unknown. Here, we present experiments using a reconstituted fusion system that suggest a simple model in which the complexin accessory helix forms an alternative four-helix bundle with the target-SNARE near the membrane, preventing the vesicle-SNARE from completing its zippering.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3736854/" 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/PMC3736854/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Giraudo, Claudio G -- Garcia-Diaz, Alejandro -- Eng, William S -- Chen, Yuhang -- Hendrickson, Wayne A -- Melia, Thomas J -- Rothman, James E -- R01 GM071458/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2009 Jan 23;323(5913):512-6. doi: 10.1126/science.1166500.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology and Cellular Biophysics, Columbia University, College of Physicians and Surgeons, 1150 Saint Nicholas Avenue, Russ Berrie Building, Room 520, New York, NY 10032, USA. claudio.giraudo@yale.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19164750" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Vesicular Transport ; Amino Acid Motifs ; Amino Acid Sequence ; HeLa Cells ; Humans ; Hydrophobic and Hydrophilic Interactions ; *Membrane Fusion ; Models, Molecular ; Molecular Sequence Data ; Mutant Proteins/chemistry/metabolism ; Mutation ; Nerve Tissue Proteins/*chemistry/genetics/*metabolism ; Protein Binding ; Protein Structure, Secondary ; Recombinant Fusion Proteins/chemistry/metabolism ; SNARE Proteins/*chemistry/*metabolism ; Vesicle-Associated Membrane Protein 2/*chemistry/*metabolism
    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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  • 4
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    Canonical Wnt signaling regulates organ-specific assembly and differentiation of CNS vasculature (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-11-22
    Description: Every organ depends on blood vessels for oxygen and nutrients, but the vasculature associated with individual organs can be structurally and molecularly diverse. The central nervous system (CNS) vasculature consists of a tightly sealed endothelium that forms the blood-brain barrier, whereas blood vessels of other organs are more porous. Wnt7a and Wnt7b encode two Wnt ligands produced by the neuroepithelium of the developing CNS coincident with vascular invasion. Using genetic mouse models, we found that these ligands directly target the vascular endothelium and that the CNS uses the canonical Wnt signaling pathway to promote formation and CNS-specific differentiation of the organ's vasculature.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stenman, Jan M -- Rajagopal, Jay -- Carroll, Thomas J -- Ishibashi, Makoto -- McMahon, Jill -- McMahon, Andrew P -- DK054364/DK/NIDDK NIH HHS/ -- HL076393/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2008 Nov 21;322(5905):1247-50. doi: 10.1126/science.1164594.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19023080" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood-Brain Barrier/*embryology ; Central Nervous System/*blood supply/*embryology ; Embryonic Induction ; Mice ; Mutation ; *Neovascularization, Physiologic ; Neuroepithelial Cells/physiology ; Proto-Oncogene Proteins/genetics/*physiology ; *Signal Transduction ; Wnt Proteins/genetics/*physiology ; beta Catenin/physiology
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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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    Evolution of hormone-receptor complexity by molecular exploitation (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-04-08
    Description: According to Darwinian theory, complexity evolves by a stepwise process of elaboration and optimization under natural selection. Biological systems composed of tightly integrated parts seem to challenge this view, because it is not obvious how any element's function can be selected for unless the partners with which it interacts are already present. Here we demonstrate how an integrated molecular system-the specific functional interaction between the steroid hormone aldosterone and its partner the mineralocorticoid receptor-evolved by a stepwise Darwinian process. Using ancestral gene resurrection, we show that, long before the hormone evolved, the receptor's affinity for aldosterone was present as a structural by-product of its partnership with chemically similar, more ancient ligands. Introducing two amino acid changes into the ancestral sequence recapitulates the evolution of present-day receptor specificity. Our results indicate that tight interactions can evolve by molecular exploitation-recruitment of an older molecule, previously constrained for a different role, into a new functional complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bridgham, Jamie T -- Carroll, Sean M -- Thornton, Joseph W -- F32-GM074398/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Apr 7;312(5770):97-101.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Ecology and Evolutionary Biology, University of Oregon, Eugene, OR 97403, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16601189" target="_blank"〉PubMed〈/a〉
    Keywords: Aldosterone/chemistry/*metabolism ; Amino Acid Substitution ; Animals ; Bayes Theorem ; Binding Sites ; Desoxycorticosterone/metabolism ; *Evolution, Molecular ; Gene Duplication ; Hagfishes ; Hydrocortisone/metabolism ; Lampreys ; Ligands ; Mutation ; Perciformes ; Phylogeny ; Rats ; Receptors, Glucocorticoid/chemistry/genetics/metabolism ; Receptors, Mineralocorticoid/chemistry/*genetics/*metabolism ; Receptors, Steroid/chemistry/*genetics/*metabolism ; Skates (Fish)
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  • 6
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    CHD1 motor protein is required for deposition of histone variant H3.3 into chromatin in vivo (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-08-25
    Description: The organization of chromatin affects all aspects of nuclear DNA metabolism in eukaryotes. H3.3 is an evolutionarily conserved histone variant and a key substrate for replication-independent chromatin assembly. Elimination of chromatin remodeling factor CHD1 in Drosophila embryos abolishes incorporation of H3.3 into the male pronucleus, renders the paternal genome unable to participate in zygotic mitoses, and leads to the development of haploid embryos. Furthermore, CHD1, but not ISWI, interacts with HIRA in cytoplasmic extracts. Our findings establish CHD1 as a major factor in replacement histone metabolism in the nucleus and reveal a critical role for CHD1 in the earliest developmental instances of genome-scale, replication-independent nucleosome assembly. Furthermore, our results point to the general requirement of adenosine triphosphate (ATP)-utilizing motor proteins for histone deposition in vivo.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3014568/" 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/PMC3014568/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Konev, Alexander Y -- Tribus, Martin -- Park, Sung Yeon -- Podhraski, Valerie -- Lim, Chin Yan -- Emelyanov, Alexander V -- Vershilova, Elena -- Pirrotta, Vincenzo -- Kadonaga, James T -- Lusser, Alexandra -- Fyodorov, Dmitry V -- GM58272/GM/NIGMS NIH HHS/ -- GM74233/GM/NIGMS NIH HHS/ -- R01 GM074233/GM/NIGMS NIH HHS/ -- Y 275/Austrian Science Fund FWF/Austria -- New York, N.Y. -- Science. 2007 Aug 24;317(5841):1087-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17717186" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/metabolism ; Adenosine Triphosphate/metabolism ; Animals ; Cell Cycle Proteins/metabolism ; Chromatin/*metabolism ; *Chromatin Assembly and Disassembly ; DNA-Binding Proteins/genetics/*metabolism ; Drosophila/embryology/genetics/metabolism/*physiology ; Drosophila Proteins/genetics/*metabolism ; Embryo, Nonmammalian/physiology ; Embryonic Development ; Female ; Haploidy ; Histone Chaperones ; Histones/*metabolism ; Male ; Mutation ; Nucleosomes/metabolism ; Protamines/metabolism ; Spermatozoa/physiology ; Transcription Factors/genetics/*metabolism ; Transgenes
    Print ISSN: 0036-8075
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  • 7
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    A molecular clutch disables flagella in the Bacillus subtilis biofilm (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-06-21
    Description: Biofilms are multicellular aggregates of sessile bacteria encased by an extracellular matrix and are important medically as a source of drug-resistant microbes. In Bacillus subtilis, we found that an operon required for biofilm matrix biosynthesis also encoded an inhibitor of motility, EpsE. EpsE arrested flagellar rotation in a manner similar to that of a clutch, by disengaging motor force-generating elements in cells embedded in the biofilm matrix. The clutch is a simple, rapid, and potentially reversible form of motility control.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Blair, Kris M -- Turner, Linda -- Winkelman, Jared T -- Berg, Howard C -- Kearns, Daniel B -- AI065540/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2008 Jun 20;320(5883):1636-8. doi: 10.1126/science.1157877.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Indiana University, Bloomington, IN 47405, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18566286" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacillus subtilis/genetics/*physiology ; Bacterial Proteins/chemistry/genetics/metabolism/*physiology ; Biofilms/*growth & development ; Flagella/*physiology ; Genes, Bacterial ; Molecular Motor Proteins/genetics/*physiology ; Molecular Sequence Data ; Movement ; Mutation ; Operon ; Protein Structure, Tertiary ; Recombinant Fusion Proteins/metabolism
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  • 8
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    Retrograde signaling by Syt 4 induces presynaptic release and synapse-specific growth (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-11-08
    Description: The molecular pathways involved in retrograde signal transduction at synapses and the function of retrograde communication are poorly understood. Here, we demonstrate that postsynaptic calcium 2+ ion (Ca2+) influx through glutamate receptors and subsequent postsynaptic vesicle fusion trigger a robust induction of presynaptic miniature release after high-frequency stimulation at Drosophila neuromuscular junctions. An isoform of the synaptotagmin family, synaptotagmin 4 (Syt 4), serves as a postsynaptic Ca2+ sensor to release retrograde signals that stimulate enhanced presynaptic function through activation of the cyclic adenosine monophosphate (cAMP)-cAMP-dependent protein kinase pathway. Postsynaptic Ca2+ influx also stimulates local synaptic differentiation and growth through Syt 4-mediated retrograde signals in a synapse-specific manner.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yoshihara, Motojiro -- Adolfsen, Bill -- Galle, Kathleen T -- Littleton, J Troy -- R01 NS040296/NS/NINDS NIH HHS/ -- R01 NS040296-06/NS/NINDS NIH HHS/ -- R01 NS043244/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2005 Nov 4;310(5749):858-63.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Picower Institute for Learning and Memory, Department of Biology, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. motojiro@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16272123" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Calcium/metabolism ; Cell Differentiation/genetics/physiology ; Cyclic AMP/metabolism ; Cyclic AMP-Dependent Protein Kinases/metabolism ; Drosophila/embryology/growth & development/*physiology ; Egtazic Acid/analogs & derivatives/pharmacology ; Embryo, Nonmammalian/cytology/physiology ; Excitatory Postsynaptic Potentials ; Feedback, Physiological ; Models, Neurological ; Mutation ; Neuromuscular Junction/*physiology ; Neuronal Plasticity ; Presynaptic Terminals/physiology ; Receptors, Glutamate/metabolism ; *Signal Transduction ; Synapses/*physiology/ultrastructure ; Synaptic Membranes/physiology ; Synaptic Transmission ; Synaptic Vesicles/physiology
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  • 9
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    Transient homologous chromosome pairing marks the onset of X inactivation (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-21
    Description: Mammalian X inactivation turns off one female X chromosome to enact dosage compensation between XX and XY individuals. X inactivation is known to be regulated in cis by Xite, Tsix, and Xist, but in principle the two Xs must also be regulated in trans to ensure mutually exclusive silencing. Here, we demonstrate that interchromosomal pairing mediates this communication. Pairing occurs transiently at the onset of X inactivation and is specific to the X-inactivation center. Deleting Xite and Tsix perturbs pairing and counting/choice, whereas their autosomal insertion induces de novo X-autosome pairing. Ectopic X-autosome interactions inhibit endogenous X-X pairing and block the initiation of X-chromosome inactivation. Thus, Tsix and Xite function both in cis and in trans. We propose that Tsix and Xite regulate counting and mutually exclusive choice through X-X pairing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, Na -- Tsai, Chia-Lun -- Lee, Jeannie T -- New York, N.Y. -- Science. 2006 Feb 24;311(5764):1149-52. Epub 2006 Jan 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular Biology, Massachusetts General Hospital, Department of Genetics, Harvard Medical School Boston, MA 02114, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16424298" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Differentiation ; Cell Line ; *Chromosome Pairing ; Female ; In Situ Hybridization, Fluorescence ; Male ; Mice ; Mice, Transgenic ; Models, Genetic ; Mutation ; RNA, Long Noncoding ; RNA, Untranslated/genetics/metabolism ; Regulatory Elements, Transcriptional ; Stem Cells ; Transgenes ; X Chromosome/genetics/*physiology ; *X Chromosome Inactivation
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  • 10
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    A hexanucleotide element directs microRNA nuclear import (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    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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