1s0v

Structural basis for substrate selection by T7 RNA polymerase

spinqualitylabelsall models 1s0v, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1s0v is a 16 chain structure with sequence from Escherichia phage T7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.2Å Ligands: APC, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT, TOPSAN Function RPOL_BPT7 DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Responsible for the transcription of the late genes of T7. It is rifampicin-resistant. It recognizes a specific promoter sequence, unwinds the double-stranded RNA to expose the coding strand for templating, initiates transcription preferentially with a purine. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The mechanism by which nucleotide polymerases select the correct substrate is of fundamental importance to the fidelity of DNA replication and transcription. During the nucleotide addition cycle, pol I DNA polymerases undergo the transition from a catalytically inactive "open" to an active "closed" conformation. All known determinants of substrate selection are associated with the "closed" state. To elucidate if this mechanism is conserved in homologous single subunit RNA polymerases (RNAPs), we have determined the structure of T7 RNAP elongation complex with the incoming substrate analog. Surprisingly, the substrate specifically binds to RNAP in the "open" conformation, where it is base paired with the acceptor template base, while Tyr639 provides discrimination of ribose versus deoxyribose substrates. The structure therefore suggests a novel mechanism, in which the substrate selection occurs prior to the isomerization to the catalytically active conformation. Modeling of multisubunit RNAPs suggests that this mechanism might be universal for all RNAPs. Structural basis for substrate selection by t7 RNA polymerase.,Temiakov D, Patlan V, Anikin M, McAllister WT, Yokoyama S, Vassylyev DG Cell. 2004 Feb 6;116(3):381-91. PMID:15016373 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also RNA polymerase 3D structures

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