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{{STRUCTURE_3zd7| PDB=3zd7 | SCENE= }}
==Snapshot 3 of RIG-I scanning on RNA duplex==
===Snapshot 3 of RIG-I scanning on RNA duplex===
<StructureSection load='3zd7' size='340' side='right' caption='[[3zd7]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
{{ABSTRACT_PUBMED_23897087}}
== Structural highlights ==
<table><tr><td colspan='2'>[[3zd7]] is a 3 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=3ZD7 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3ZD7 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3zd6|3zd6]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/RNA_helicase RNA helicase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.4.13 3.6.4.13] </span></td></tr>
<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=3zd7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3zd7 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3zd7 RCSB], [http://www.ebi.ac.uk/pdbsum/3zd7 PDBsum]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Retinoic acid-inducible gene-I (RIG-I) is an intracellular RNA sensor that activates the innate immune machinery in response to infection by RNA viruses. Here, we report the crystal structure of distinct conformations of a RIG-I:dsRNA complex, which shows that HEL2i-mediated scanning allows RIG-I to sense the length of RNA targets. To understand the implications of HEL2i scanning for catalytic activity and signalling by RIG-I, we examined its ATPase activity when stimulated by duplex RNAs of varying lengths and 5' composition. We identified a minimal RNA duplex that binds one RIG-I molecule, stimulates robust ATPase activity, and elicits a RIG-I-mediated interferon response in cells. Our results reveal that the minimal functional unit of the RIG-I:RNA complex is a monomer that binds at the terminus of a duplex RNA substrate. This behaviour is markedly different from the RIG-I paralog melanoma differentiation-associated gene 5 (MDA5), which forms cooperative filaments.


==Function==
Defining the functional determinants for RNA surveillance by RIG-I.,Kohlway A, Luo D, Rawling DC, Ding SC, Pyle AM EMBO Rep. 2013 Jul 30. doi: 10.1038/embor.2013.108. PMID:23897087<ref>PMID:23897087</ref>
[[http://www.uniprot.org/uniprot/DDX58_HUMAN DDX58_HUMAN]] Innate immune receptor which acts as a cytoplasmic sensor of viral nucleic acids and plays a major role in sensing viral infection and in the activation of a cascade of antiviral responses including the induction of type I interferons and proinflammatory cytokines. Its ligands include: 5'-triphosphorylated ssRNA and dsRNA and short dsRNA (<1 kb in length). In addition to the 5'-triphosphate moiety, blunt-end base pairing at the 5'-end of the RNA is very essential. Overhangs at the non-triphosphorylated end of the dsRNA RNA have no major impact on its activity. A 3'overhang at the 5'triphosphate end decreases and any 5'overhang at the 5' triphosphate end abolishes its activity. Upon ligand binding it associates with mitochondria antiviral signaling protein (MAVS/IPS1) which activates the IKK-related kinases: TBK1 and IKBKE which phosphorylate interferon regulatory factors: IRF3 and IRF7 which in turn activate transcription of antiviral immunological genes, including interferons (IFNs); IFN-alpha and IFN-beta. Detects both positive and negative strand RNA viruses including members of the families Paramyxoviridae: Human respiratory syncytial virus and measles virus (MeV), Rhabdoviridae: vesicular stomatitis virus (VSV), Orthomyxoviridae: influenza A and B virus, Flaviviridae: Japanese encephalitis virus (JEV), hepatitis C virus (HCV), dengue virus (DENV) and west Nile virus (WNV). It also detects rotavirus and reovirus. Also involved in antiviral signaling in response to viruses containing a dsDNA genome such as Epstein-Barr virus (EBV). Detects dsRNA produced from non-self dsDNA by RNA polymerase III, such as Epstein-Barr virus-encoded RNAs (EBERs). May play important roles in granulocyte production and differentiation, bacterial phagocytosis and in the regulation of cell migration.<ref>PMID:15208624</ref> <ref>PMID:16125763</ref> <ref>PMID:15708988</ref> <ref>PMID:16153868</ref> <ref>PMID:16127453</ref> <ref>PMID:17190814</ref> <ref>PMID:18636086</ref> <ref>PMID:19631370</ref> <ref>PMID:19576794</ref> <ref>PMID:19122199</ref> <ref>PMID:19211564</ref> <ref>PMID:19609254</ref> <ref>PMID:21742966</ref>


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
[[3zd7]] is a 3 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=3ZD7 OCA].
</div>
 
== References ==
==Reference==
<references/>
<ref group="xtra">PMID:023897087</ref><references group="xtra"/><references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: RNA helicase]]
[[Category: RNA helicase]]
[[Category: Luo, D.]]
[[Category: Luo, D]]
[[Category: Pyle, A M.]]
[[Category: Pyle, A M]]
[[Category: Helicase]]
[[Category: Helicase]]
[[Category: Hydrolase-rna complex]]
[[Category: Hydrolase-rna complex]]
[[Category: Innate immunity]]
[[Category: Innate immunity]]

Revision as of 09:35, 21 December 2014

Snapshot 3 of RIG-I scanning on RNA duplex

3zd7, resolution 2.50Å

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