1XQP: Crystal Structure Of 8-oxoguanosine Complexed Pa-agog, 8-oxoguanine Dna Glycosylase From Pyrobaculum Aerophilum

Studies of DNA base excision repair (BER) pathways in the hyperthermophilic crenarchaeon Pyrobaculum aerophilum identified an 8-oxoguanine-DNA glycosylase, Pa-AGOG (archaeal GO glycosylase), with distinct functional characteristics. Here, we describe its crystal structure and that of its complex with 8-oxoguanosine at 1.0 and 1.7 A resolution, respectively. Characteristic structural features are identified that confirm Pa-AGOG to be the founding member of a functional class within the helix-hairpin-helix (HhH) superfamily of DNA repair enzymes. Its hairpin structure differs substantially from that of other proteins containing an HhH motif, and we predict that it interacts with the DNA backbone in a distinct manner. Furthermore, the mode of 8-oxoguanine recognition, which involves several hydrogen-bonding and pi-stacking interactions, is unlike that observed in human OGG1, the prototypic 8-oxoguanine HhH-type DNA glycosylase. Despite these differences, the predicted kinked conformation of bound DNA and the catalytic mechanism are likely to resemble those of human OGG1.
PDB ID: 1XQPDownload
MMDB ID: 30737
PDB Deposition Date: 2004/10/13
Updated in MMDB: 2017/11
Experimental Method:
x-ray diffraction
Resolution: 1.69  Å
Source Organism:
Similar Structures:
Biological Unit for 1XQP: monomeric; determined by author
Molecular Components in 1XQP
Label Count Molecule
Protein (1 molecule)
8-oxoguanine DNA Glycosylase
Molecule annotation
Chemicals (2 molecules)
* Click molecule labels to explore molecular sequence information.

Citing MMDB