3F10 image
Entry Detail
PDB ID:
3F10
Title:
Crystal structure of Clostridium Acetobutylicum 8-oxoguanine DNA glycosylase in complex with 8-oxoguanosine
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2008-10-27
Release Date:
2009-04-07
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 41 3 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:8-oxoguanine-DNA-glycosylase
Mutations:K222Q
Chain IDs:A
Chain Length:292
Number of Molecules:1
Biological Source:Clostridium acetobutylicum
Primary Citation
Structural characterization of Clostridium acetobutylicum 8-oxoguanine DNA glycosylase in its apo form and in complex with 8-oxodeoxyguanosine.
J.Mol.Biol. 387 669 679 (2009)
PMID: 19361427 DOI: 10.1016/j.jmb.2009.01.067

Abstact

DNA is subject to a multitude of oxidative damages generated by oxidizing agents from metabolism and exogenous sources and by ionizing radiation. Guanine is particularly vulnerable to oxidation, and the most common oxidative product 8-oxoguanine (8-oxoG) is the most prevalent lesion observed in DNA molecules. 8-OxoG can form a normal Watson-Crick pair with cytosine (8-oxoG:C), but it can also form a stable Hoogsteen pair with adenine (8-oxoG:A), leading to a G:C-->T:A transversion after replication. Fortunately, 8-oxoG is recognized and excised by either of two DNA glycosylases of the base excision repair pathway: formamidopyrimidine-DNA glycosylase and 8-oxoguanine DNA glycosylase (Ogg). While Clostridium acetobutylicum Ogg (CacOgg) DNA glycosylase can specifically recognize and remove 8-oxoG, it displays little preference for the base opposite the lesion, which is unusual for a member of the Ogg1 family. This work describes the crystal structures of CacOgg in its apo form and in complex with 8-oxo-2'-deoxyguanosine. A structural comparison between the apo form and the liganded form of the enzyme reveals a structural reorganization of the C-terminal domain upon binding of 8-oxoG, similar to that reported for human OGG1. A structural comparison of CacOgg with human OGG1, in complex with 8-oxoG containing DNA, provides a structural rationale for the lack of opposite base specificity displayed by CacOgg.

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