1xwl | pdb_00001xwl

BACILLUS STEAROTHERMOPHILUS (NEWLY IDENTIFIED STRAIN AS YET UNNAMED) DNA POLYMERASE FRAGMENT

spinqualitylabelsall models 1xwl, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1xwl is a 1 chain structure with sequence from Atcc 12980. This structure supersedes the now removed PDB entry 1bdp. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Gene: BACILLUS STEAROTHERMOPHILUS (ATCC 12980) Activity: DNA-directed DNA polymerase, with EC number 2.7.7.7 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 BACKGROUND: The study of DNA polymerases in the Pol l family is central to the understanding of DNA replication and repair. DNA polymerases are used in many molecular biology techniques, including PCR, which require a thermostable polymerase. In order to learn about Pol I function and the basis of thermostability, we undertook structural studies of a new thermostable DNA polymerase. RESULTS: A DNA polymerase large, Klenow-like, fragment from a recently identified thermostable strain of Bacillus stearothermophilus (BF) was cloned, sequenced, overexpressed and characterized. Its crystal structure was determined to 2.1 A resolution by the method of multiple isomorphous replacement. CONCLUSIONS: This structure represents the highest resolution view of a Pol I enzyme obtained to date. Comparison of the three Pol I structures reveals no compelling evidence for many of the specific interactions that have been proposed to induce thermostability, but suggests that thermostability arises from innumerable small changes distributed throughout the protein structure. The polymerase domain is highly conserved in all three proteins. The N-terminal domains are highly divergent in sequence, but retain a common fold. When present, the 3'-5' proofreading exonuclease activity is associated with this domain. Its absence is associated with changes in catalytic residues that coordinate the divalent ions required for activity and in loops connecting homologous secondary structural elements. In BF, these changes result in a blockage of the DNA-binding cleft. Crystal structure of a thermostable Bacillus DNA polymerase I large fragment at 2.1 A resolution.,Kiefer JR, Mao C, Hansen CJ, Basehore SL, Hogrefe HH, Braman JC, Beese LS Structure. 1997 Jan 15;5(1):95-108. PMID:9016716 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA polymerase

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