5ytc

Large fragment of DNA Polymerase I from Thermus aquaticus in a closed ternary complex with the unnatural base M-fC pair with dATP in the active site

spinqualitylabelsall models 5ytc, resolution 2.28Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ytc is a 3 chain structure with sequence from Thermus aquaticus 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 2.28Å Ligands: 92F, DOC, DTP, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DPO1_THEAQ Publication Abstract from PubMed The emergence of unnatural DNA bases provides opportunities to demystify the mechanisms by which DNA polymerases faithfully decode chemical information on the template. It was previously shown that two unnatural cytosine bases (termed "M-fC" and "I-fC"), which are chemical labeling adducts of the epigenetic base 5-formylcytosine, can induce C-to-T transition during DNA amplification. However, how DNA polymerases recognize such unnatural cytosine bases remains enigmatic. Herein, crystal structures of unnatural cytosine bases pairing to dA/dG in the KlenTaq polymerase-host-guest complex system and pairing to dATP in the KlenTaq polymerase active site were determined. Both M-fC and I-fC base pair with dA/dATP, but not with dG, in a Watson-Crick geometry. This study reveals that the formation of the Watson-Crick geometry, which may be enabled by the A-rule, is important for the recognition of unnatural cytosines. Unnatural Cytosine Bases Recognized as Thymines by DNA Polymerases by the Formation of the Watson-Crick Geometry.,Zeng H, Mondal M, Song R, Zhang J, Xia B, Liu M, Zhu C, He B, Gao YQ, Yi C Angew Chem Int Ed Engl. 2019 Jan 2;58(1):130-133. doi: 10.1002/anie.201807845., Epub 2018 Dec 5. PMID:30407705 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA polymerase 3D structures

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