ID END3_RICCN Reviewed; 210 AA. AC Q92GH4; DT 15-FEB-2005, integrated into UniProtKB/Swiss-Prot. DT 01-DEC-2001, sequence version 1. DT 02-SEP-2026, entry version 129. 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=RC1149; OS Rickettsia conorii (strain ATCC VR-613 / Malish 7). OC Bacteria; Pseudomonadati; Pseudomonadota; Alphaproteobacteria; OC Rickettsiales; Rickettsiaceae; Rickettsieae; Rickettsia; OC spotted fever group. OX NCBI_TaxID=272944; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=ATCC VR-613 / Malish 7; RX PubMed=11557893; DOI=10.1126/science.1061471; RA Ogata H., Audic S., Renesto-Audiffren P., Fournier P.-E., Barbe V., RA Samson D., Roux V., Cossart P., Weissenbach J., Claverie J.-M., Raoult D.; RT "Mechanisms of evolution in Rickettsia conorii and R. prowazekii."; RL Science 293:2093-2098(2001). 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; AE006914; AAL03687.1; -; Genomic_DNA. DR PIR; E97843; E97843. DR RefSeq; WP_010977720.1; NC_003103.1. DR AlphaFoldDB; Q92GH4; -. DR SMR; Q92GH4; -. DR GeneID; 928298; -. DR KEGG; rco:RC1149; -. DR PATRIC; fig|272944.4.peg.1323; -. DR HOGENOM; CLU_012862_3_0_5; -. DR Proteomes; UP000000816; 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; 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; PF10576; EndIII_4Fe-2S; 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 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..210 FT /note="Endonuclease III" FT /id="PRO_0000102220" FT DOMAIN 108..127 FT /note="HhH" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" FT BINDING 187 FT /ligand="[4Fe-4S] cluster" FT /ligand_id="ChEBI:CHEBI:49883" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" FT BINDING 194 FT /ligand="[4Fe-4S] cluster" FT /ligand_id="ChEBI:CHEBI:49883" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" FT BINDING 197 FT /ligand="[4Fe-4S] cluster" FT /ligand_id="ChEBI:CHEBI:49883" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" FT BINDING 203 FT /ligand="[4Fe-4S] cluster" FT /ligand_id="ChEBI:CHEBI:49883" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00942" SQ SEQUENCE 210 AA; 23702 MW; 1038D894F009EAB1 CRC64; MQAQIVNKIF EIFSKNNPNP KTELIYKNDF TLLVAVILSA QATDISVNLA TKSLFATYDT PEKILELGEE GLKKYIKSIG LFNSKAKNII ALCKILISNY QASVPNDFKA LIKLPGVGRK TANVVLNCLF GMPTMAVDTH VFRVANRIGL AKGDTPEIVE NELLQIIDTK WLTHAHHWLI LHGRYICKAR KPDCDICPIK EYCDYYFNLK //