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1u4b

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[[Image:1u4b.gif|left|200px]]
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{{Seed}}
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[[Image:1u4b.png|left|200px]]
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{{STRUCTURE_1u4b| PDB=1u4b | SCENE= }}
{{STRUCTURE_1u4b| PDB=1u4b | SCENE= }}
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'''Extension of an adenine-8oxoguanine mismatch'''
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===Extension of an adenine-8oxoguanine mismatch===
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==Overview==
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Aerobic respiration generates reactive oxygen species that can damage guanine residues and lead to the production of 8-oxoguanine (8oxoG), the major mutagenic oxidative lesion in the genome. Oxidative damage is implicated in ageing and cancer, and its prevalence presents a constant challenge to DNA polymerases that ensure accurate transmission of genomic information. When these polymerases encounter 8oxoG, they frequently catalyse misincorporation of adenine in preference to accurate incorporation of cytosine. This results in the propagation of G to T transversions, which are commonly observed somatic mutations associated with human cancers. Here, we present sequential snapshots of a high-fidelity DNA polymerase during both accurate and mutagenic replication of 8oxoG. Comparison of these crystal structures reveals that 8oxoG induces an inversion of the mismatch recognition mechanisms that normally proofread DNA, such that the 8oxoG.adenine mismatch mimics a cognate base pair whereas the 8oxoG.cytosine base pair behaves as a mismatch. These studies reveal a fundamental mechanism of error-prone replication and show how 8oxoG, and DNA lesions in general, can form mismatches that evade polymerase error-detection mechanisms, potentially leading to the stable incorporation of lethal mutations.
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The line below this paragraph, {{ABSTRACT_PUBMED_15322558}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 15322558 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15322558}}
==About this Structure==
==About this Structure==
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[[Category: Protein-dna complex]]
[[Category: Protein-dna complex]]
[[Category: Translation replication]]
[[Category: Translation replication]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:44:47 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 12:42:51 2008''

Revision as of 09:42, 28 July 2008

Image:1u4b.png

Template:STRUCTURE 1u4b

Extension of an adenine-8oxoguanine mismatch

Template:ABSTRACT PUBMED 15322558

About this Structure

Full crystallographic information is available from OCA.

Reference

Error-prone replication of oxidatively damaged DNA by a high-fidelity DNA polymerase., Hsu GW, Ober M, Carell T, Beese LS, Nature. 2004 Sep 9;431(7005):217-21. Epub 2004 Aug 22. PMID:15322558

Page seeded by OCA on Mon Jul 28 12:42:51 2008

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