4xvk | pdb_00004xvk

Binary complex of human polymerase nu and DNA with the finger domain closed

spinqualitylabelsall models 4xvk, resolution 2.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4xvk is a 3 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MES, NA Related: 4xvi, 4xvl, 4xvm Gene: POLN (HUMAN) Activity: DNA-directed DNA polymerase, with EC number 2.7.7.7 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed All DNA replicases achieve high fidelity by a conserved mechanism, but each translesion polymerase carries out mutagenic DNA synthesis in its own way. Here we report crystal structures of human DNA polymerase nu (Pol nu), which is homologous to high-fidelity replicases yet is error prone. Instead of a simple open-to-closed movement of the O helix upon binding of a correct incoming nucleotide, Pol nu has a different open state and requires the finger domain to swing sideways and undergo both opening and closing motions to accommodate the nascent base pair. A single-amino acid substitution in the O helix of the finger domain improves the fidelity of Pol nu nearly ten-fold. A unique cavity and the flexibility of the thumb domain allow Pol nu to generate and accommodate a looped-out primer strand. Primer loop-out may be a mechanism for DNA trinucloetide-repeat expansion. How a homolog of high-fidelity replicases conducts mutagenic DNA synthesis.,Lee YS, Gao Y, Yang W Nat Struct Mol Biol. 2015 Mar 16. doi: 10.1038/nsmb.2985. PMID:25775266 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA polymerase 3D structures

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