3avt | pdb_00003avt

Structure of viral RNA polymerase complex 1

spinqualitylabelsall models 3avt, resolution 2.61Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3avt is a 2 chain structure with sequence from Escherichia coli o157:h7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, GH3 Related: 3avu, 3avv, 3avw, 3avx, 3avy Resources: FirstGlance, OCA, RCSB, PDBsum 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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