ID   XNI_SODGM               Reviewed;         250 AA.
AC   Q2NRJ8;
DT   21-AUG-2007, integrated into UniProtKB/Swiss-Prot.
DT   07-FEB-2006, sequence version 1.
DT   03-AUG-2022, entry version 89.
DE   RecName: Full=Flap endonuclease Xni {ECO:0000255|HAMAP-Rule:MF_01192};
DE            Short=FEN {ECO:0000255|HAMAP-Rule:MF_01192};
DE            EC=3.1.-.- {ECO:0000255|HAMAP-Rule:MF_01192};
GN   Name=xni {ECO:0000255|HAMAP-Rule:MF_01192};
GN   Synonyms=ygdG {ECO:0000255|HAMAP-Rule:MF_01192}; OrderedLocusNames=SG1952;
OS   Sodalis glossinidius (strain morsitans).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Bruguierivoracaceae; Sodalis.
OX   NCBI_TaxID=343509;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=morsitans;
RX   PubMed=16365377; DOI=10.1101/gr.4106106;
RA   Toh H., Weiss B.L., Perkin S.A.H., Yamashita A., Oshima K., Hattori M.,
RA   Aksoy S.;
RT   "Massive genome erosion and functional adaptations provide insights into
RT   the symbiotic lifestyle of Sodalis glossinidius in the tsetse host.";
RL   Genome Res. 16:149-156(2006).
CC   -!- FUNCTION: Has flap endonuclease activity. During DNA replication, flap
CC       endonucleases cleave the 5'-overhanging flap structure that is
CC       generated by displacement synthesis when DNA polymerase encounters the
CC       5'-end of a downstream Okazaki fragment. {ECO:0000255|HAMAP-
CC       Rule:MF_01192}.
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01192};
CC       Note=Binds 2 Mg(2+) per subunit. Only one magnesium ion has a direct
CC       interaction with the protein, the other interactions are indirect.
CC       {ECO:0000255|HAMAP-Rule:MF_01192};
CC   -!- COFACTOR:
CC       Name=K(+); Xref=ChEBI:CHEBI:29103;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01192};
CC       Note=Binds 1 K(+) per subunit. The potassium ion strongly increases the
CC       affinity for DNA. {ECO:0000255|HAMAP-Rule:MF_01192};
CC   -!- SIMILARITY: Belongs to the Xni family. {ECO:0000255|HAMAP-
CC       Rule:MF_01192}.
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DR   EMBL; AP008232; BAE75227.1; -; Genomic_DNA.
DR   RefSeq; WP_011411683.1; NZ_LN854557.1.
DR   AlphaFoldDB; Q2NRJ8; -.
DR   SMR; Q2NRJ8; -.
DR   STRING; 343509.SG1952; -.
DR   EnsemblBacteria; BAE75227; BAE75227; SG1952.
DR   KEGG; sgl:SG1952; -.
DR   eggNOG; COG0258; Bacteria.
DR   HOGENOM; CLU_004675_1_2_6; -.
DR   OMA; IEMARIC; -.
DR   OrthoDB; 1220182at2; -.
DR   BioCyc; SGLO343509:SGP1_RS17895-MON; -.
DR   Proteomes; UP000001932; Chromosome.
DR   GO; GO:0017108; F:5'-flap endonuclease activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0030955; F:potassium ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0033567; P:DNA replication, Okazaki fragment processing; IEA:UniProtKB-UniRule.
DR   CDD; cd09898; H3TH_53EXO; 1.
DR   HAMAP; MF_01192; Xni; 1.
DR   InterPro; IPR020046; 5-3_exonucl_a-hlix_arch_N.
DR   InterPro; IPR002421; 5-3_exonuclease.
DR   InterPro; IPR036279; 5-3_exonuclease_C_sf.
DR   InterPro; IPR020045; DNA_polI_H3TH.
DR   InterPro; IPR038969; FEN.
DR   InterPro; IPR008918; HhH2.
DR   InterPro; IPR029060; PIN-like_dom_sf.
DR   InterPro; IPR022895; Xni.
DR   PANTHER; PTHR42646; PTHR42646; 1.
DR   Pfam; PF01367; 5_3_exonuc; 1.
DR   Pfam; PF02739; 5_3_exonuc_N; 1.
DR   SMART; SM00475; 53EXOc; 1.
DR   SMART; SM00279; HhH2; 1.
DR   SUPFAM; SSF47807; SSF47807; 1.
DR   SUPFAM; SSF88723; SSF88723; 1.
PE   3: Inferred from homology;
KW   DNA-binding; Endonuclease; Hydrolase; Magnesium; Metal-binding; Nuclease;
KW   Potassium.
FT   CHAIN           1..250
FT                   /note="Flap endonuclease Xni"
FT                   /id="PRO_0000297887"
FT   DOMAIN          160..249
FT                   /note="5'-3' exonuclease"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   REGION          184..189
FT                   /note="Interaction with DNA"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         104
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         171
FT                   /ligand="K(+)"
FT                   /ligand_id="ChEBI:CHEBI:29103"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         172
FT                   /ligand="K(+)"
FT                   /ligand_id="ChEBI:CHEBI:29103"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         180
FT                   /ligand="K(+)"
FT                   /ligand_id="ChEBI:CHEBI:29103"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         182
FT                   /ligand="K(+)"
FT                   /ligand_id="ChEBI:CHEBI:29103"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         185
FT                   /ligand="K(+)"
FT                   /ligand_id="ChEBI:CHEBI:29103"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
SQ   SEQUENCE   250 AA;  27881 MW;  14BCF425B4031697 CRC64;
     MSVHLLIVDA LNLIRRIHAV QGASCLAACG HALSQLILHC TPSHAVAVFD DDERHESWRH
     QQLPQYKSGR APIPEDLQAL MPAIRAEFNR QSVTCWHASG FEADDIAATL AIKVAAGGHR
     VTLVSTDKGY CQLLSPSIQI RDYFQKRWLD MPFVMRHFGV QPQQLTDFWG LAGVSSSKIP
     GVAGIGPKSA AQLISEAGTL EALYQRLAQL PEKWRHRLEH DRDLAFLCRR IVTLDTAVTL
     QGNLQQLRLR