View source for 3avt


==Structure of viral RNA polymerase complex 1==
<StructureSection load='3avt' size='340' side='right'caption='[[3avt]], [[Resolution|resolution]] 2.61&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3avt]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_O157:H7 Escherichia coli O157:H7], [https://en.wikipedia.org/wiki/Escherichia_virus_Qbeta Escherichia virus Qbeta] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AVT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3AVT 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]] 2.607&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GH3:3-DEOXY-GUANOSINE-5-TRIPHOSPHATE'>GH3</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=3avt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3avt OCA], [https://pdbe.org/3avt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3avt RCSB], [https://www.ebi.ac.uk/pdbsum/3avt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3avt ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/EFTU_ECO57 EFTU_ECO57] [https://www.uniprot.org/uniprot/EFTS_ECO57 EFTS_ECO57] Associates with the EF-Tu.GDP complex and induces the exchange of GDP to GTP. It remains bound to the aminoacyl-tRNA.EF-Tu.GTP complex up to the GTP hydrolysis stage on the ribosome (By similarity).[https://www.uniprot.org/uniprot/RDRP_BPQBE RDRP_BPQBE] This enzyme is part of the viral RNA-dependent RNA polymerase complex.
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== Publication Abstract from PubMed ==
Core Qbeta replicase comprises the Qbeta virus-encoded RNA-dependent RNA polymerase (beta-subunit) and the host Escherichia coli translational elongation factors EF-Tu and EF-Ts. The functions of the host proteins in the viral replicase are not clear. Structural analyses of RNA polymerization by core Qbeta replicase reveal that at the initiation stage, the 3'-adenine of the template RNA provides a stable platform for de novo initiation. EF-Tu in Qbeta replicase forms a template exit channel with the beta-subunit. At the elongation stages, the C-terminal region of the beta-subunit, assisted by EF-Tu, splits the temporarily double-stranded RNA between the template and nascent RNAs before translocation of the single-stranded template RNA into the exit channel. Therefore, EF-Tu in Qbeta replicase modulates RNA elongation processes in a distinct manner from its established function in protein synthesis.

Molecular basis for RNA polymerization by Qbeta replicase.,Takeshita D, Tomita K Nat Struct Mol Biol. 2012 Jan 15;19(2):229-37. doi: 10.1038/nsmb.2204. PMID:22245970<ref>PMID:22245970</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3avt" style="background-color:#fffaf0;"></div>

==See Also==
*[[Elongation factor 3D structures|Elongation factor 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Escherichia coli O157:H7]]
[[Category: Escherichia virus Qbeta]]
[[Category: Large Structures]]
[[Category: Synthetic construct]]
[[Category: Takeshita D]]
[[Category: Tomita K]]