3u1n

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{{STRUCTURE_3u1n| PDB=3u1n | SCENE= }}
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==Structure of the catalytic core of human SAMHD1==
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===Structure of the catalytic core of human SAMHD1===
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<StructureSection load='3u1n' size='340' side='right' caption='[[3u1n]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
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{{ABSTRACT_PUBMED_22056990}}
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== Structural highlights ==
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<table><tr><td colspan='2'>[[3u1n]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3U1N OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3U1N FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3u1n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3u1n OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3u1n RCSB], [http://www.ebi.ac.uk/pdbsum/3u1n PDBsum]</span></td></tr>
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</table>
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== Disease ==
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[[http://www.uniprot.org/uniprot/SAMH1_HUMAN SAMH1_HUMAN]] Defects in SAMHD1 are the cause of Aicardi-Goutieres syndrome type 5 (AGS5) [MIM:[http://omim.org/entry/612952 612952]]. A form of Aicardi-Goutieres syndrome, a genetically heterogeneous disease characterized by cerebral atrophy, leukoencephalopathy, intracranial calcifications, chronic cerebrospinal fluid (CSF) lymphocytosis, increased CSF alpha-interferon, and negative serologic investigations for common prenatal infection. Clinical features as thrombocytopenia, hepatosplenomegaly and elevated hepatic transaminases along with intermittent fever may erroneously suggest an infective process. Severe neurological dysfunctions manifest in infancy as progressive microcephaly, spasticity, dystonic posturing and profound psychomotor retardation. Death often occurs in early childhood.<ref>PMID:19525956</ref> <ref>PMID:20842748</ref> Defects in SAMHD1 are the cause of chilblain lupus type 2 (CHBL2) [MIM:[http://omim.org/entry/614415 614415]]. A rare cutaneous form of lupus erythematosus. Affected individuals present with painful bluish-red papular or nodular lesions of the skin in acral locations precipitated by cold and wet exposure at temperatures less than 10 degrees centigrade.<ref>PMID:21204240</ref>
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== Function ==
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[[http://www.uniprot.org/uniprot/SAMH1_HUMAN SAMH1_HUMAN]] Putative nuclease involved in innate immune response by acting as a negative regulator of the cell-intrinsic antiviral response. May play a role in mediating proinflammatory responses to TNF-alpha signaling.<ref>PMID:18546154</ref> <ref>PMID:19525956</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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SAMHD1, an analogue of the murine interferon (IFN)-gamma-induced gene Mg11 (ref. 1), has recently been identified as a human immunodeficiency virus-1 (HIV-1) restriction factor that blocks early-stage virus replication in dendritic and other myeloid cells and is the target of the lentiviral protein Vpx, which can relieve HIV-1 restriction. SAMHD1 is also associated with Aicardi-Goutieres syndrome (AGS), an inflammatory encephalopathy characterized by chronic cerebrospinal fluid lymphocytosis and elevated levels of the antiviral cytokine IFN-alpha. The pathology associated with AGS resembles congenital viral infection, such as transplacentally acquired HIV. Here we show that human SAMHD1 is a potent dGTP-stimulated triphosphohydrolase that converts deoxynucleoside triphosphates to the constituent deoxynucleoside and inorganic triphosphate. The crystal structure of the catalytic core of SAMHD1 reveals that the protein is dimeric and indicates a molecular basis for dGTP stimulation of catalytic activity against dNTPs. We propose that SAMHD1, which is highly expressed in dendritic cells, restricts HIV-1 replication by hydrolysing the majority of cellular dNTPs, thus inhibiting reverse transcription and viral complementary DNA (cDNA) synthesis.
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==Disease==
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HIV-1 restriction factor SAMHD1 is a deoxynucleoside triphosphate triphosphohydrolase.,Goldstone DC, Ennis-Adeniran V, Hedden JJ, Groom HC, Rice GI, Christodoulou E, Walker PA, Kelly G, Haire LF, Yap MW, de Carvalho LP, Stoye JP, Crow YJ, Taylor IA, Webb M Nature. 2011 Nov 6. doi: 10.1038/nature10623. PMID:22056990<ref>PMID:22056990</ref>
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[[http://www.uniprot.org/uniprot/SAMH1_HUMAN SAMH1_HUMAN]] Defects in SAMHD1 are the cause of Aicardi-Goutieres syndrome type 5 (AGS5) [MIM:[http://omim.org/entry/612952 612952]]. A form of Aicardi-Goutieres syndrome, a genetically heterogeneous disease characterized by cerebral atrophy, leukoencephalopathy, intracranial calcifications, chronic cerebrospinal fluid (CSF) lymphocytosis, increased CSF alpha-interferon, and negative serologic investigations for common prenatal infection. Clinical features as thrombocytopenia, hepatosplenomegaly and elevated hepatic transaminases along with intermittent fever may erroneously suggest an infective process. Severe neurological dysfunctions manifest in infancy as progressive microcephaly, spasticity, dystonic posturing and profound psychomotor retardation. Death often occurs in early childhood.<ref>PMID:19525956</ref><ref>PMID:20842748</ref> Defects in SAMHD1 are the cause of chilblain lupus type 2 (CHBL2) [MIM:[http://omim.org/entry/614415 614415]]. A rare cutaneous form of lupus erythematosus. Affected individuals present with painful bluish-red papular or nodular lesions of the skin in acral locations precipitated by cold and wet exposure at temperatures less than 10 degrees centigrade.<ref>PMID:21204240</ref>
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==Function==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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[[http://www.uniprot.org/uniprot/SAMH1_HUMAN SAMH1_HUMAN]] Putative nuclease involved in innate immune response by acting as a negative regulator of the cell-intrinsic antiviral response. May play a role in mediating proinflammatory responses to TNF-alpha signaling.<ref>PMID:18546154</ref><ref>PMID:19525956</ref>
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</div>
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== References ==
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==About this Structure==
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<references/>
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[[3u1n]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3U1N OCA].
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__TOC__
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</StructureSection>
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==Reference==
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<ref group="xtra">PMID:022056990</ref><references group="xtra"/><references/>
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[[Category: Homo sapiens]]
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[[Category: Ennis-Adeniran, V]]
[[Category: Ennis-Adeniran, V]]
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[[Category: Goldstone, D C.]]
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[[Category: Goldstone, D C]]
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[[Category: Haire, L F.]]
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[[Category: Haire, L F]]
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[[Category: Taylor, I A.]]
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[[Category: Taylor, I A]]
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[[Category: Walker, P A.]]
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[[Category: Walker, P A]]
[[Category: Webb, M]]
[[Category: Webb, M]]
[[Category: Deoxynucleotide triphosphohydrolase]]
[[Category: Deoxynucleotide triphosphohydrolase]]
[[Category: Hd-domain]]
[[Category: Hd-domain]]
[[Category: Hydrolase]]
[[Category: Hydrolase]]

Revision as of 07:31, 12 November 2014

Structure of the catalytic core of human SAMHD1

3u1n, resolution 3.10Å

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