ID END3_BUCBP Reviewed; 215 AA. AC Q89AW4; DT 16-JUN-2003, integrated into UniProtKB/Swiss-Prot. DT 16-JUN-2003, sequence version 1. DT 02-SEP-2026, entry version 133. DE RecName: Full=Endonuclease III {ECO:0000255|HAMAP-Rule:MF_00942}; DE EC=4.2.99.18 {ECO:0000255|HAMAP-Rule:MF_00942}; DE AltName: Full=DNA-(apurinic or apyrimidinic site) lyase {ECO:0000255|HAMAP-Rule:MF_00942}; GN Name=nth {ECO:0000255|HAMAP-Rule:MF_00942}; OrderedLocusNames=bbp_114; OS Buchnera aphidicola subsp. Baizongia pistaciae (strain Bp). OC Bacteria; Pseudomonadati; Pseudomonadota; Gammaproteobacteria; OC Enterobacterales; Erwiniaceae; Buchnera. OX NCBI_TaxID=224915; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=Bp; RX PubMed=12522265; DOI=10.1073/pnas.0235981100; RA van Ham R.C.H.J., Kamerbeek J., Palacios C., Rausell C., Abascal F., RA Bastolla U., Fernandez J.M., Jimenez L., Postigo M., Silva F.J., RA Tamames J., Viguera E., Latorre A., Valencia A., Moran F., Moya A.; RT "Reductive genome evolution in Buchnera aphidicola."; RL Proc. Natl. Acad. Sci. U.S.A. 100:581-586(2003). CC -!- FUNCTION: DNA repair enzyme that has both DNA N-glycosylase activity CC and AP-lyase activity. The DNA N-glycosylase activity releases various CC damaged pyrimidines from DNA by cleaving the N-glycosidic bond, leaving CC an AP (apurinic/apyrimidinic) site. The AP-lyase activity cleaves the CC phosphodiester bond 3' to the AP site by a beta-elimination, leaving a CC 3'-terminal unsaturated sugar and a product with a terminal 5'- CC phosphate. {ECO:0000255|HAMAP-Rule:MF_00942}. CC -!- CATALYTIC ACTIVITY: CC Reaction=2'-deoxyribonucleotide-(2'-deoxyribose 5'-phosphate)-2'- CC deoxyribonucleotide-DNA = a 3'-end 2'-deoxyribonucleotide-(2,3- CC dehydro-2,3-deoxyribose 5'-phosphate)-DNA + a 5'-end 5'-phospho-2'- CC deoxyribonucleoside-DNA + H(+); Xref=Rhea:RHEA:66592, Rhea:RHEA- CC COMP:13180, Rhea:RHEA-COMP:16897, Rhea:RHEA-COMP:17067, CC ChEBI:CHEBI:15378, ChEBI:CHEBI:136412, ChEBI:CHEBI:157695, CC ChEBI:CHEBI:167181; EC=4.2.99.18; Evidence={ECO:0000255|HAMAP- CC Rule:MF_00942}; CC -!- COFACTOR: CC Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883; CC Evidence={ECO:0000255|HAMAP-Rule:MF_00942}; CC Note=Binds 1 [4Fe-4S] cluster. {ECO:0000255|HAMAP-Rule:MF_00942}; CC -!- SIMILARITY: Belongs to the Nth/MutY family. {ECO:0000255|HAMAP- CC Rule:MF_00942}. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; AE016826; AAO26848.1; -; Genomic_DNA. DR AlphaFoldDB; Q89AW4; -. DR SMR; Q89AW4; -. DR STRING; 224915.bbp_114; -. DR KEGG; bab:bbp_114; -. DR eggNOG; COG0177; Bacteria. DR HOGENOM; CLU_012862_3_0_6; -. DR OrthoDB; 9800977at2; -. DR Proteomes; UP000000601; Chromosome. DR GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-UniRule. DR GO; GO:0140078; F:class I DNA-(apurinic or apyrimidinic site) endonuclease activity; IEA:UniProtKB-EC. DR GO; GO:0003677; F:DNA binding; IEA:UniProtKB-UniRule. DR GO; GO:0019104; F:DNA N-glycosylase activity; IEA:UniProtKB-UniRule. DR GO; GO:0006285; P:base-excision repair, AP site formation; IEA:TreeGrafter. DR CDD; cd00056; ENDO3c; 1. DR FunFam; 1.10.1670.10:FF:000001; Endonuclease III; 1. DR FunFam; 1.10.340.30:FF:000001; Endonuclease III; 1. DR Gene3D; 1.10.1670.10; Helix-hairpin-Helix base-excision DNA repair enzymes (C-terminal); 1. DR Gene3D; 1.10.340.30; Hypothetical protein, domain 2; 1. DR HAMAP; MF_00942; Nth; 1. DR InterPro; IPR011257; DNA_glycosylase. DR InterPro; IPR004036; Endonuclease-III-like_CS2. DR InterPro; IPR003651; Endonuclease3_FeS-loop_motif. DR InterPro; IPR003265; HhH-GPD_domain. DR InterPro; IPR023170; HhH_base_excis_C. DR InterPro; IPR000445; HhH_motif. DR InterPro; IPR003583; Hlx-hairpin-Hlx_DNA-bd_motif. DR InterPro; IPR005759; Nth. DR NCBIfam; TIGR01083; nth; 1. DR PANTHER; PTHR10359; A/G-SPECIFIC ADENINE GLYCOSYLASE/ENDONUCLEASE III; 1. DR PANTHER; PTHR10359:SF18; ENDONUCLEASE III; 1. DR Pfam; PF00633; HHH; 1. DR Pfam; PF00730; HhH-GPD; 1. DR PIRSF; PIRSF001435; Nth; 1. DR SMART; SM00478; ENDO3c; 1. DR SMART; SM00525; FES; 1. DR SMART; SM00278; HhH1; 1. DR SUPFAM; SSF48150; DNA-glycosylase; 1. DR PROSITE; PS01155; ENDONUCLEASE_III_2; 1. PE 3: Inferred from homology; KW 4Fe-4S; DNA damage; DNA repair; DNA-binding; Glycosidase; Hydrolase; Iron; KW Iron-sulfur; Lyase; Metal-binding; Reference proteome. FT CHAIN 1..215 FT /note="Endonuclease III" FT /id="PRO_0000102216" FT DOMAIN 113..132 FT /note="HhH" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" FT BINDING 192 FT /ligand="[4Fe-4S] cluster" FT /ligand_id="ChEBI:CHEBI:49883" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" FT BINDING 199 FT /ligand="[4Fe-4S] cluster" FT /ligand_id="ChEBI:CHEBI:49883" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" FT BINDING 202 FT /ligand="[4Fe-4S] cluster" FT /ligand_id="ChEBI:CHEBI:49883" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" FT BINDING 208 FT /ligand="[4Fe-4S] cluster" FT /ligand_id="ChEBI:CHEBI:49883" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" SQ SEQUENCE 215 AA; 24645 MW; BBC7338010D43451 CRC64; MEIKKLNHKN RYKILKMFSN IYINFKTGLV FTSNFELLIS VMLSAQTTDR MVNKTTQRLF GIANTPSGFI SIGLHAIREN IRKLGLYNKK SSNILRTCEI LLKRYGGKVP NNREDLESLP GVGRKTANVI LNVIFKKKTI AVDTHVFRLC NRIGFAKGTT VLTVEKKLLN IVPEKFKLNF HAWFIMHGRY ICTSRVPKCS KCIISSLCEF KDKNI //