1rrq
From Proteopedia
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| , resolution 2.22Å | |||||||
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| Ligands: | , , , , , , | ||||||
| Gene: | muty (Geobacillus stearothermophilus) | ||||||
| Related: | 1RRS, 1RRT
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
MutY adenine glycosylase in complex with DNA containing an A:oxoG pair
Overview
The genomes of aerobic organisms suffer chronic oxidation of guanine to the genotoxic product 8-oxoguanine (oxoG). Replicative DNA polymerases misread oxoG residues and insert adenine instead of cytosine opposite the oxidized base. Both bases in the resulting A*oxoG mispair are mutagenic lesions, and both must undergo base-specific replacement to restore the original C*G pair. Doing so represents a formidable challenge to the DNA repair machinery, because adenine makes up roughly 25% of the bases in most genomes. The evolutionarily conserved enzyme adenine DNA glycosylase (called MutY in bacteria and hMYH in humans) initiates repair of A*oxoG to C*G by removing the inappropriately paired adenine base from the DNA backbone. A central issue concerning MutY function is the mechanism by which A*oxoG mispairs are targeted among the vast excess of A*T pairs. Here we report the use of disulphide crosslinking to obtain high-resolution crystal structures of MutY-DNA lesion-recognition complexes. These structures reveal the basis for recognizing both lesions in the A*oxoG pair and for catalysing removal of the adenine base.
About this Structure
1RRQ is a Single protein structure of sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA.
Reference
Structural basis for removal of adenine mispaired with 8-oxoguanine by MutY adenine DNA glycosylase., Fromme JC, Banerjee A, Huang SJ, Verdine GL, Nature. 2004 Feb 12;427(6975):652-6. PMID:14961129
Page seeded by OCA on Sun Mar 30 23:32:03 2008
