4bdp

CRYSTAL STRUCTURE OF BACILLUS DNA POLYMERASE I FRAGMENT COMPLEXED TO 11 BASE PAIRS OF DUPLEX DNA AFTER ADDITION OF TWO DATP RESIDUES

spinqualitylabelsall models 4bdp, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4bdp is a 3 chain structure with sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: MG, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 DNA polymerases copy DNA templates with remarkably high fidelity, checking for correct base-pair formation both at nucleotide insertion and at subsequent DNA extension steps. Despite extensive biochemical, genetic and structural studies, the mechanism by which nucleotides are correctly incorporated is not known. Here we present high-resolution crystal structures of a thermostable bacterial (Bacillus stearothermophilus) DNA polymerase I large fragments with DNA primer templates bound productively at the polymerase active site. The active site retains catalytic activity, allowing direct observation of the products of several rounds of nucleotide incorporation. The polymerase also retains its ability to discriminate between correct and incorrectly paired nucleotides in the crystal. Comparison of the structures of successively translocated complexes allows the structural features for the sequence-independent molecular recognition of correctly formed base pairs to be deduced unambiguously. These include extensive interactions with the first four to five base pairs in the minor groove, location of the terminal base pair in a pocket of excellent steric complementarity favouring correct base-pair formation, and a conformational switch from B-form to underwound A-form DNA at the polymerase active site. Visualizing DNA replication in a catalytically active Bacillus DNA polymerase crystal.,Kiefer JR, Mao C, Braman JC, Beese LS Nature. 1998 Jan 15;391(6664):304-7. PMID:9440698 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA polymerase 3D structures

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