1nkc | pdb_00001nkc

A BACILLUS DNA POLYMERASE I PRODUCT COMPLEX BOUND TO A GUANINE-THYMINE MISMATCH AFTER FIVE ROUNDS OF PRIMER EXTENSION, FOLLOWING INCORPORATION OF DCTP, DGTP, DTTP, AND DATP.

spinqualitylabelsall models 1nkc, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1nkc is a 3 chain structure with sequence from Atcc 12980. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG, SO4, SUC Related: 1njw, 1njx, 1njy, 1njz, 1nk0, 1nk4, 1nk5, 1nk6, 1nk7, 1nk8, 1nk9, 1nkb, 1nke Activity: DNA-directed DNA polymerase, with EC number 2.7.7.7 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [DPO1_GEOSE] In addition to polymerase activity, this DNA polymerase exhibits 5' to 3' exonuclease activity. 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 Accurate DNA replication is essential for genomic stability. One mechanism by which high-fidelity DNA polymerases maintain replication accuracy involves stalling of the polymerase in response to covalent incorporation of mismatched base pairs, thereby favoring subsequent mismatch excision. Some polymerases retain a "short-term memory" of replication errors, responding to mismatches up to four base pairs in from the primer terminus. Here we a present a structural characterization of all 12 possible mismatches captured at the growing primer terminus in the active site of a polymerase. Our observations suggest four mechanisms that lead to mismatch-induced stalling of the polymerase. Furthermore, we have observed the effects of extending a mismatch up to six base pairs from the primer terminus and find that long-range distortions in the DNA transmit the presence of the mismatch back to the enzyme active site, suggesting the structural basis for the short-term memory of replication errors. Structures of mismatch replication errors observed in a DNA polymerase.,Johnson SJ, Beese LS Cell. 2004 Mar 19;116(6):803-16. PMID:15035983 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA polymerase

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