Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1bixa_ Alpha and beta proteins (a+b) DNase I-like DNase I-like DNase I-like DNA repair endonuclease Hap1 human (Homo sapiens ) [TaxId: 9606 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyDNase I-like 8024346 4002213 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyDNase I-like 8036725 3000957 SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AExo_endo_phose1bixA1 A: a+b four layersX: Carbon-nitrogen hydrolase-likeH: DNase I-like (From Topology)T: DNase I-likeF: Exo_endo_phosECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.60.10.10 Alpha Beta 4-Layer Sandwich Deoxyribonuclease I Chain ACATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF03372Endonuclease/Exonuclease/phosphatase family (Exo_endo_phos)Endonuclease/Exonuclease/phosphatase familyThis large family of proteins includes magnesium dependent endonucleases and a large number of phosphatases involved in intracellular signalling [1]. This family includes: AP endonuclease proteins EC:4.2.99.18 e.g Swiss:P27695, DNase I proteins EC:3. ...This large family of proteins includes magnesium dependent endonucleases and a large number of phosphatases involved in intracellular signalling [1]. This family includes: AP endonuclease proteins EC:4.2.99.18 e.g Swiss:P27695, DNase I proteins EC:3.1.21.1 e.g. Swiss:P24855, Synaptojanin an inositol-1,4,5-trisphosphate phosphatase EC:3.1.3.56 Swiss:O43426, Sphingomyelinase EC:3.1.4.12 Swiss:P11889 and Nocturnin Swiss:O35710.
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
AP ENDONUCLEASE 1

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

ChainsEnzyme NameDescriptionCatalytic Residues
8-oxoguanine DNA-glycosylase (ExoA family)  M-CSA #510

Human apurinic/apyrimidinic endonuclease I (HAP1) sourced from Homo sapiens is an essential DNA repair enzyme that initiates the removal of apurinic/apyrimidinic sites from DNA, excises 3' replication-blocking moieties and modulates DNA binding activity of several transcriptional regulators. HAP1 recognises abasic sites in ds DNA and makes a single nick in the backbone 5' to the abasic site generating the 3' hydroxyl required by the repair polymerase. Abasic lesions arise at high frequency in DNA due to spontaneous, mutagen induced or glycosylase-mediated hydrolysis of the N-glycosylic bond and represent cytotoxic and mutagenic lesions if uncorrected. HAP1 also exhibits 3'phosphodiesterase, 3'->5' exonuclease and RNase H activity. The Ref-1 (redox effector factor) activity of HAP1 is to regulate the DNA-binding affinity of transcription factors such as Jun/Fos and NF-kB through a redox mechanism.

Defined by 8 residues: ASP:A-39 [auth A-70]GLU:A-65 [auth A-96]TYR:A-140 [auth A-171]ASP:A-179 [auth A-210]ASN:A-181 [auth A-212]ASP:A-252 [auth A-283]ASP:A-277 [auth A-308]HIS:A-278 [auth A-309]
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