5vu8

TNA polymerase, closed ternary complex

spinqualitylabelsall models 5vu8, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5vu8 is a 3 chain structure with sequence from Thermococcus kodakarensis and Synthetic construct. 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: 9O4, 9O7, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function D0VWU9_THEKO Publication Abstract from PubMed Darwinian evolution experiments carried out on xeno-nucleic acid (XNA) polymers require engineered polymerases that can faithfully and efficiently copy genetic information back and forth between DNA and XNA. However, current XNA polymerases function with inferior activity relative to their natural counterparts. Here, we report five X-ray crystal structures that illustrate the pathway by which alpha-(L)-threofuranosyl nucleic acid (TNA) triphosphates are selected and extended in a template-dependent manner using a laboratory-evolved polymerase known as Kod-RI. Structural comparison of the apo, binary, open and closed ternary, and translocated product detail an ensemble of interactions and conformational changes required to promote TNA synthesis. Close inspection of the active site in the closed ternary structure reveals a sub-optimal binding geometry that explains the slow rate of catalysis. This key piece of information, which is missing for all naturally occurring archaeal DNA polymerases, provides a framework for engineering new TNA polymerase variants. Structural basis for TNA synthesis by an engineered TNA polymerase.,Chim N, Shi C, Sau SP, Nikoomanzar A, Chaput JC Nat Commun. 2017 Nov 27;8(1):1810. doi: 10.1038/s41467-017-02014-0. PMID:29180809 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA polymerase 3D structures

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