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FEN1_SALSA
ID   FEN1_SALSA              Reviewed;         380 AA.
AC   B9EMY6; B9EQK7;
DT   11-JAN-2011, integrated into UniProtKB/Swiss-Prot.
DT   24-MAR-2009, sequence version 1.
DT   03-AUG-2022, entry version 53.
DE   RecName: Full=Flap endonuclease 1 {ECO:0000255|HAMAP-Rule:MF_03140};
DE            Short=FEN-1 {ECO:0000255|HAMAP-Rule:MF_03140};
DE            EC=3.1.-.- {ECO:0000255|HAMAP-Rule:MF_03140};
DE   AltName: Full=Flap structure-specific endonuclease 1 {ECO:0000255|HAMAP-Rule:MF_03140};
GN   Name=fen1;
OS   Salmo salar (Atlantic salmon).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Actinopterygii; Neopterygii; Teleostei; Protacanthopterygii; Salmoniformes;
OC   Salmonidae; Salmoninae; Salmo.
OX   NCBI_TaxID=8030;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORMS A AND B).
RC   TISSUE=Head kidney, and Thyroid;
RX   PubMed=20433749; DOI=10.1186/1471-2164-11-279;
RA   Leong J.S., Jantzen S.G., von Schalburg K.R., Cooper G.A., Messmer A.M.,
RA   Liao N.Y., Munro S., Moore R., Holt R.A., Jones S.J., Davidson W.S.,
RA   Koop B.F.;
RT   "Salmo salar and Esox lucius full-length cDNA sequences reveal changes in
RT   evolutionary pressures on a post-tetraploidization genome.";
RL   BMC Genomics 11:279-279(2010).
CC   -!- FUNCTION: Structure-specific nuclease with 5'-flap endonuclease and 5'-
CC       3' exonuclease activities involved in DNA replication and repair.
CC       During DNA replication, cleaves the 5'-overhanging flap structure that
CC       is generated by displacement synthesis when DNA polymerase encounters
CC       the 5'-end of a downstream Okazaki fragment. It enters the flap from
CC       the 5'-end and then tracks to cleave the flap base, leaving a nick for
CC       ligation. Also involved in the long patch base excision repair (LP-BER)
CC       pathway, by cleaving within the apurinic/apyrimidinic (AP) site-
CC       terminated flap. Acts as a genome stabilization factor that prevents
CC       flaps from equilibrating into structures that lead to duplications and
CC       deletions. Also possesses 5'-3' exonuclease activity on nicked or
CC       gapped double-stranded DNA, and exhibits RNase H activity. Also
CC       involved in replication and repair of rDNA and in repairing
CC       mitochondrial DNA. {ECO:0000255|HAMAP-Rule:MF_03140}.
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_03140};
CC       Note=Binds 2 magnesium ions per subunit. They probably participate in
CC       the reaction catalyzed by the enzyme. May bind an additional third
CC       magnesium ion after substrate binding. {ECO:0000255|HAMAP-
CC       Rule:MF_03140};
CC   -!- SUBUNIT: Interacts with PCNA. Three molecules of fen1 bind to one PCNA
CC       trimer with each molecule binding to one PCNA monomer. PCNA stimulates
CC       the nuclease activity without altering cleavage specificity.
CC       {ECO:0000255|HAMAP-Rule:MF_03140}.
CC   -!- SUBCELLULAR LOCATION: Nucleus, nucleolus {ECO:0000255|HAMAP-
CC       Rule:MF_03140}. Nucleus, nucleoplasm {ECO:0000255|HAMAP-Rule:MF_03140}.
CC       Mitochondrion {ECO:0000255|HAMAP-Rule:MF_03140}. Note=Resides mostly in
CC       the nucleoli and relocalizes to the nucleoplasm upon DNA damage.
CC       {ECO:0000255|HAMAP-Rule:MF_03140}.
CC   -!- ALTERNATIVE PRODUCTS:
CC       Event=Alternative splicing; Named isoforms=2;
CC       Name=B;
CC         IsoId=B9EMY6-1; Sequence=Displayed;
CC       Name=A;
CC         IsoId=B9EMY6-2; Sequence=VSP_040395, VSP_040396;
CC   -!- PTM: Phosphorylated. Phosphorylation upon DNA damage induces
CC       relocalization to the nuclear plasma. {ECO:0000255|HAMAP-
CC       Rule:MF_03140}.
CC   -!- SIMILARITY: Belongs to the XPG/RAD2 endonuclease family. FEN1
CC       subfamily. {ECO:0000255|HAMAP-Rule:MF_03140}.
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DR   EMBL; BT057011; ACM08883.1; -; mRNA.
DR   EMBL; BT057756; ACM09628.1; -; mRNA.
DR   EMBL; BT057932; ACM09804.1; -; mRNA.
DR   RefSeq; XP_014015192.1; XM_014159717.1. [B9EMY6-1]
DR   RefSeq; XP_014015193.1; XM_014159718.1. [B9EMY6-1]
DR   RefSeq; XP_014015194.1; XM_014159719.1. [B9EMY6-1]
DR   AlphaFoldDB; B9EMY6; -.
DR   SMR; B9EMY6; -.
DR   STRING; 8030.ENSSSAP00000112685; -.
DR   GeneID; 100196000; -.
DR   KEGG; sasa:100196000; -.
DR   CTD; 2237; -.
DR   Proteomes; UP000087266; Chromosome ssa19.
DR   GO; GO:0005739; C:mitochondrion; IEA:UniProtKB-SubCell.
DR   GO; GO:0005730; C:nucleolus; IEA:UniProtKB-SubCell.
DR   GO; GO:0005654; C:nucleoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0008409; F:5'-3' exonuclease activity; IEA:UniProtKB-UniRule.
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:0006284; P:base-excision repair; IEA:UniProtKB-UniRule.
DR   GO; GO:0043137; P:DNA replication, removal of RNA primer; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_00614; Fen; 1.
DR   InterPro; IPR036279; 5-3_exonuclease_C_sf.
DR   InterPro; IPR023426; Flap_endonuc.
DR   InterPro; IPR008918; HhH2.
DR   InterPro; IPR029060; PIN-like_dom_sf.
DR   InterPro; IPR006086; XPG-I_dom.
DR   InterPro; IPR006084; XPG/Rad2.
DR   InterPro; IPR019974; XPG_CS.
DR   InterPro; IPR006085; XPG_DNA_repair_N.
DR   PANTHER; PTHR11081; PTHR11081; 1.
DR   Pfam; PF00867; XPG_I; 1.
DR   Pfam; PF00752; XPG_N; 1.
DR   PRINTS; PR00853; XPGRADSUPER.
DR   SMART; SM00279; HhH2; 1.
DR   SMART; SM00484; XPGI; 1.
DR   SMART; SM00485; XPGN; 1.
DR   SUPFAM; SSF47807; SSF47807; 1.
DR   SUPFAM; SSF88723; SSF88723; 1.
DR   PROSITE; PS00841; XPG_1; 1.
DR   PROSITE; PS00842; XPG_2; 1.
PE   2: Evidence at transcript level;
KW   Alternative splicing; DNA damage; DNA repair; DNA replication;
KW   Endonuclease; Exonuclease; Hydrolase; Magnesium; Metal-binding;
KW   Mitochondrion; Nuclease; Nucleus; Phosphoprotein; Reference proteome.
FT   CHAIN           1..380
FT                   /note="Flap endonuclease 1"
FT                   /id="PRO_0000403491"
FT   REGION          1..104
FT                   /note="N-domain"
FT   REGION          122..253
FT                   /note="I-domain"
FT   REGION          336..344
FT                   /note="Interaction with PCNA"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   REGION          348..380
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   BINDING         34
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         47
FT                   /ligand="DNA"
FT                   /ligand_id="ChEBI:CHEBI:16991"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         70
FT                   /ligand="DNA"
FT                   /ligand_id="ChEBI:CHEBI:16991"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         86
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         158
FT                   /ligand="DNA"
FT                   /ligand_id="ChEBI:CHEBI:16991"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         158
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         160
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         179
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         181
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         231
FT                   /ligand="DNA"
FT                   /ligand_id="ChEBI:CHEBI:16991"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         233
FT                   /ligand="DNA"
FT                   /ligand_id="ChEBI:CHEBI:16991"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   BINDING         233
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT   VAR_SEQ         170..192
FT                   /note="GKVFATATEDMDGLTFGTGVLLR -> PHCQRSQKASYPGVPVHSPSAGH
FT                   (in isoform A)"
FT                   /evidence="ECO:0000303|PubMed:20433749"
FT                   /id="VSP_040395"
FT   VAR_SEQ         193..380
FT                   /note="Missing (in isoform A)"
FT                   /evidence="ECO:0000303|PubMed:20433749"
FT                   /id="VSP_040396"
SQ   SEQUENCE   380 AA;  42475 MW;  02EA34F292899769 CRC64;
     MGIHGLAKLI ADQAPSAIKE QDIKNYFGRK IAIDASMCMY QFLVAVRQDG NVLQNENGET
     TSHLMGMFYR TIRMLEHGIK PVYVFDGKPP QLKSGELEKR GERRAEAEKL LAQAQEAGEQ
     ENIDKFSKRL VKVTQQHNDE CKKLLTLMGV PYIEAPCEAE ASCAALVKAG KVFATATEDM
     DGLTFGTGVL LRHLTASEAK KLPIQEFQFT RLLQDINLTH EQFIDLCILL GCDYCGTIKG
     IGPKRAIDLI RQHGSIEEIL ENIDSSKHPA PEDWLYKEAR GLFLQPDVVD CSTVDLKWSE
     PDEDALIQFM CAEKQFSEDR IKNGCKKILK SRQGSTQGRL DTFFTITGSL SSKRKEPETK
     GSNKKKQKTG ATPGKFKKGK
 
 
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