Annotations: 6U7T


Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyDNA-glycosylase 8040877 3000905 SCOP2B (2022-06-29)
ASCOP2B SuperfamilyNudix 8040880 3000098 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AHhH-GPDe6u7tA2 A: alpha arraysX: HhH/H2THH: SAM/DNA-glycosylaseT: DNA-glycosylaseF: HhH-GPDECOD (1.6)
ANUDIX_4e6u7tA1 A: a+b two layersX: beta-GraspH: Nudix (From Topology)T: NudixF: NUDIX_4ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF00633Helix-hairpin-helix motif (HHH)Helix-hairpin-helix motif- Motif
PF10576Iron-sulfur binding domain of endonuclease III (EndIII_4Fe-2S)Iron-sulfur binding domain of endonuclease IIIEscherichia coli endonuclease III (EC 4.2.99.18) [1] is a DNA repair enzyme that acts both as a DNA N-glycosylase, removing oxidised pyrimidines from DNA, and as an apurinic/apyrimidinic (AP) endonuclease, introducing a single-strand nick at the site ...Domain
PF14815NUDIX domain (NUDIX_4)NUDIX domainDomain
PF00730HhH-GPD superfamily base excision DNA repair protein (HhH-GPD)HhH-GPD superfamily base excision DNA repair proteinThis family contains a diverse range of structurally related DNA repair proteins. The superfamily is called the HhH-GPD family after its hallmark Helix-hairpin-helix and Gly/Pro rich loop followed by a conserved aspartate [2]. This includes endonucle ...Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
Adenine DNA glycosylase -
DNA (5'-D(*AP*AP*GP*AP*CP*(8OG)P*TP*GP*GP*AP*C)-3')---
DNA (5'-D(P*GP*TP*CP*CP*AP*(NR1)P*GP*TP*CP*T)-3')---

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
adenine DNA glycosylase  M-CSA #807

Oxidative DNA damage is caused by reactive oxygen species that are generated during aerobic respiration and immune response. The oxidative lesions in DNA caused are repaired by the base excision repair pathway. Hydroxyl radicals rapidly react with guanine C8 producing a steady state level of mutagenic 8-oxoguanines in cells. It also creates 8-oxo-GTP that, like 8-oxoguanines in DNA template, is often mispaired with adenine by replicative polymerases, creating A-T to C-G and G-C to T-A transversion mutations.

DNA glycosylase MutY recognises the mutational intermediate 8-oxoguanine-adenine mispair and excises adenine from the mispair. This creates an abasic site that is then processed by the multi-enzyme base excision repair pathway. The sequence of MutY is conserved from bacteria to humans suggesting its fundamental importance in DNA repair. Mutations of MutY increases transversion frequencies and hence cancer susceptibility in human. MutY belongs to the base excision repair glycosylases superfamily which includes both pure DNA glycosylases and DNA glycosylase/lyases. The most conserved structural element in this family is the Helix-hairpin-Helix (HhH) motif. A revised MutY reaction mechanism was published in 2016, which involves a covalent intermediate and two oxocarbenium ion-like transition states. There is sufficient structural, mutagenesis and biochemical date to support the proposed mechanism described.

Defined by 3 residues: GLU:A-43TYR:A-126ASP:A-144
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