View source for 3vkw


==Crystal Structure of the Superfamily 1 Helicase from Tomato Mosaic Virus==
<StructureSection load='3vkw' size='340' side='right'caption='[[3vkw]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3vkw]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Tobacco_mosaic_virus_strain_tomato/L Tobacco mosaic virus strain tomato/L]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3VKW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3VKW FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3vkw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3vkw OCA], [https://pdbe.org/3vkw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3vkw RCSB], [https://www.ebi.ac.uk/pdbsum/3vkw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3vkw ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RDRP_TOML RDRP_TOML] Replicase large subunit: is an RNA-dependent RNA polymerase active in viral RNA replication.  Replicase small subunit: is a methyltransferase active in RNA capping and an RNA helicase. Methyltransferase displays a cytoplasmic capping enzyme activity. This function is necessary since all viral RNAs are synthesized in the cytoplasm, and host capping enzymes are restricted to the nucleus. Helicase region probably exhibits NTPase and RNA unwinding activities (Potential). It also acts as a suppressor of RNA-mediated gene silencing, also known as post-transcriptional gene silencing (PTGS), a mechanism of plant viral defense that limits the accumulation of viral RNAs. May mediate silencing suppression through either inhibition of HEN1-mediated siRNA or siRNA demethylation (By similarity).
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Tobacco mosaic virus strain tomato/L]]
[[Category: Inoue T]]
[[Category: Ishibashi K]]
[[Category: Ishikawa M]]
[[Category: Katoh E]]
[[Category: Matsumura H]]
[[Category: Niiyama M]]
[[Category: Nishikiori M]]
[[Category: Sugiyama S]]
[[Category: Xiang H]]