1tk0

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{{STRUCTURE_1tk0| PDB=1tk0 | SCENE= }}
{{STRUCTURE_1tk0| PDB=1tk0 | SCENE= }}
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'''T7 DNA polymerase ternary complex with 8 oxo guanosine and ddCTP at the insertion site'''
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===T7 DNA polymerase ternary complex with 8 oxo guanosine and ddCTP at the insertion site===
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==Overview==
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Accurate DNA replication involves polymerases with high nucleotide selectivity and proofreading activity. We show here why both fidelity mechanisms fail when normally accurate T7 DNA polymerase bypasses the common oxidative lesion 8-oxo-7, 8-dihydro-2'-deoxyguanosine (8oG). The crystal structure of the polymerase with 8oG templating dC insertion shows that the O8 oxygen is tolerated by strong kinking of the DNA template. A model of a corresponding structure with dATP predicts steric and electrostatic clashes that would reduce but not eliminate insertion of dA. The structure of a postinsertional complex shows 8oG(syn).dA (anti) in a Hoogsteen-like base pair at the 3' terminus, and polymerase interactions with the minor groove surface of the mismatch that mimic those with undamaged, matched base pairs. This explains why translesion synthesis is permitted without proofreading of an 8oG.dA mismatch, thus providing insight into the high mutagenic potential of 8oG.
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{{ABSTRACT_PUBMED_15297882}}
==About this Structure==
==About this Structure==
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[[Category: 8 oxo guanosine]]
[[Category: 8 oxo guanosine]]
[[Category: Dna polymerase]]
[[Category: Dna polymerase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:02:43 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 17:20:44 2008''

Revision as of 14:20, 27 July 2008

Image:1tk0.png

Template:STRUCTURE 1tk0

T7 DNA polymerase ternary complex with 8 oxo guanosine and ddCTP at the insertion site

Template:ABSTRACT PUBMED 15297882

About this Structure

1TK0 is a Protein complex structure of sequences from Enterobacteria phage t7 and Escherichia coli. Full crystallographic information is available from OCA.

Reference

Structural basis for the dual coding potential of 8-oxoguanosine by a high-fidelity DNA polymerase., Brieba LG, Eichman BF, Kokoska RJ, Doublie S, Kunkel TA, Ellenberger T, EMBO J. 2004 Sep 1;23(17):3452-61. Epub 2004 Aug 5. PMID:15297882

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