ID   XNI_ALIF1               Reviewed;         259 AA.
AC   Q5E7A7;
DT   21-AUG-2007, integrated into UniProtKB/Swiss-Prot.
DT   15-MAR-2005, 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=VF_0594;
OS   Aliivibrio fischeri (strain ATCC 700601 / ES114) (Vibrio fischeri).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Vibrionales; Vibrionaceae;
OC   Aliivibrio.
OX   NCBI_TaxID=312309;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700601 / ES114;
RX   PubMed=15703294; DOI=10.1073/pnas.0409900102;
RA   Ruby E.G., Urbanowski M., Campbell J., Dunn A., Faini M., Gunsalus R.,
RA   Lostroh P., Lupp C., McCann J., Millikan D., Schaefer A., Stabb E.,
RA   Stevens A., Visick K., Whistler C., Greenberg E.P.;
RT   "Complete genome sequence of Vibrio fischeri: a symbiotic bacterium with
RT   pathogenic congeners.";
RL   Proc. Natl. Acad. Sci. U.S.A. 102:3004-3009(2005).
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; CP000020; AAW85089.1; -; Genomic_DNA.
DR   RefSeq; WP_011261344.1; NC_006840.2.
DR   RefSeq; YP_203977.1; NC_006840.2.
DR   AlphaFoldDB; Q5E7A7; -.
DR   SMR; Q5E7A7; -.
DR   STRING; 312309.VF_0594; -.
DR   EnsemblBacteria; AAW85089; AAW85089; VF_0594.
DR   KEGG; vfi:VF_0594; -.
DR   PATRIC; fig|312309.11.peg.586; -.
DR   eggNOG; COG0258; Bacteria.
DR   HOGENOM; CLU_004675_1_2_6; -.
DR   OMA; WRVDLIP; -.
DR   OrthoDB; 1220182at2; -.
DR   Proteomes; UP000000537; Chromosome I.
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; Reference proteome.
FT   CHAIN           1..259
FT                   /note="Flap endonuclease Xni"
FT                   /id="PRO_0000297888"
FT   DOMAIN          165..255
FT                   /note="5'-3' exonuclease"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   REGION          189..194
FT                   /note="Interaction with DNA"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         109
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         176
FT                   /ligand="K(+)"
FT                   /ligand_id="ChEBI:CHEBI:29103"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         177
FT                   /ligand="K(+)"
FT                   /ligand_id="ChEBI:CHEBI:29103"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         187
FT                   /ligand="K(+)"
FT                   /ligand_id="ChEBI:CHEBI:29103"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
FT   BINDING         190
FT                   /ligand="K(+)"
FT                   /ligand_id="ChEBI:CHEBI:29103"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01192"
SQ   SEQUENCE   259 AA;  29502 MW;  DD6D61F43872D725 CRC64;
     MAIHLVIIDA LNLIRRVHSA QPNQDDIQAV ITTTTRTINK ILKETEPTHI IAVFDHHLQD
     RGWRAEILPQ YKEDRKPMPE ALQKGMDDIQ EAWWKLGIDS LLSDGDEADD LVATLANKVA
     MHNEQVTIIS TDKGYCQLLS PTLRIRDYFQ HRWLDAPFVE KEFGLKPEQL ADYWGLAGIS
     SSKITGIPGV GPKAALEILT QFPTIEAANE SEDLPKKYRK KFDEHYETAI LCRQVAGLRT
     DIELGFNLQD IRYEKGTRD