2hhw: Difference between revisions

Revision as of 14:24, 27 July 2008

This article has been automatically seeded. Changes to this page should pertain to the PDB entry only and not to the protein or biomolecule in general.

File:2hhw.png

Template:STRUCTURE 2hhw

ddTTP:O6-methyl-guanine pair in the polymerase active site, in the closed conformationddTTP:O6-methyl-guanine pair in the polymerase active site, in the closed conformation

Template:ABSTRACT PUBMED 17179038

About this StructureAbout this Structure

2HHW is a Single protein structure of sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA.

ReferenceReference

The structural basis for the mutagenicity of O(6)-methyl-guanine lesions., Warren JJ, Forsberg LJ, Beese LS, Proc Natl Acad Sci U S A. 2006 Dec 26;103(52):19701-6. Epub 2006 Dec 18. PMID:17179038

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OCA

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 {{STRUCTURE_2hhw|  PDB=2hhw  |  SCENE=  }}
-'''ddTTP:O6-methyl-guanine pair in the polymerase active site, in the closed conformation'''
+===ddTTP:O6-methyl-guanine pair in the polymerase active site, in the closed conformation===
-==Overview==
+<!--
-Methylating agents are widespread environmental carcinogens that generate a broad spectrum of DNA damage. Methylation at the guanine O(6) position confers the greatest mutagenic and carcinogenic potential. DNA polymerases insert cytosine and thymine with similar efficiency opposite O(6)-methyl-guanine (O6MeG). We combined pre-steady-state kinetic analysis and a series of nine x-ray crystal structures to contrast the reaction pathways of accurate and mutagenic replication of O6MeG in a high-fidelity DNA polymerase from Bacillus stearothermophilus. Polymerases achieve substrate specificity by selecting for nucleotides with shape and hydrogen-bonding patterns that complement a canonical DNA template. Our structures reveal that both thymine and cytosine O6MeG base pairs evade proofreading by mimicking the essential molecular features of canonical substrates. The steric mimicry depends on stabilization of a rare cytosine tautomer in C.O6MeG-polymerase complexes. An unusual electrostatic interaction between O-methyl protons and a thymine carbonyl oxygen helps stabilize T.O6MeG pairs bound to DNA polymerase. Because DNA methylators constitute an important class of chemotherapeutic agents, the molecular mechanisms of replication of these DNA lesions are important for our understanding of both the genesis and treatment of cancer.
+The line below this paragraph, {{ABSTRACT_PUBMED_17179038}}, adds the Publication Abstract to the page
+(as it appears on PubMed at http://www.pubmed.gov), where 17179038 is the PubMed ID number.
+-->
+{{ABSTRACT_PUBMED_17179038}}
 ==About this Structure==
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 [[Category: Klenow fragment]]
 [[Category: O6-methyl-guanine]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 06:18:54 2008''
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