ID FEN1_ENTBH Reviewed; 358 AA.
AC B7XHS8;
DT 11-JAN-2011, integrated into UniProtKB/Swiss-Prot.
DT 03-MAR-2009, sequence version 1.
DT 27-MAR-2024, entry version 58.
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 {ECO:0000255|HAMAP-Rule:MF_03140}; ORFNames=EBI_21734;
OS Enterocytozoon bieneusi (strain H348) (Microsporidian parasite).
OC Eukaryota; Fungi; Fungi incertae sedis; Microsporidia; Enterocytozoonidae;
OC Enterocytozoon.
OX NCBI_TaxID=481877;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=H348;
RX PubMed=18060071; DOI=10.1371/journal.pone.0001277;
RA Corradi N., Akiyoshi D.E., Morrison H.G., Feng X., Weiss L.M., Tzipori S.,
RA Keeling P.J.;
RT "Patterns of genome evolution among the microsporidian parasites
RT Encephalitozoon cuniculi, Antonospora locustae and Enterocytozoon
RT bieneusi.";
RL PLoS ONE 2:E1277-E1277(2007).
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=H348;
RX PubMed=19132089; DOI=10.1371/journal.ppat.1000261;
RA Akiyoshi D.E., Morrison H.G., Lei S., Feng X., Zhang Q., Corradi N.,
RA Mayanja H., Tumwine J.K., Keeling P.J., Weiss L.M., Tzipori S.;
RT "Genomic survey of the non-cultivatable opportunistic human pathogen,
RT Enterocytozoon bieneusi.";
RL PLoS Pathog. 5:E1000261-E1000261(2009).
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 -!- 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; ABGB01000015; EED44575.1; -; Genomic_DNA.
DR RefSeq; XP_002649556.1; XM_002649510.1.
DR AlphaFoldDB; B7XHS8; -.
DR SMR; B7XHS8; -.
DR STRING; 481877.B7XHS8; -.
DR VEuPathDB; MicrosporidiaDB:EBI_21734; -.
DR HOGENOM; CLU_032444_2_0_1; -.
DR InParanoid; B7XHS8; -.
DR OMA; IQEVHID; -.
DR OrthoDB; 5479162at2759; -.
DR Proteomes; UP000001742; Unassembled WGS sequence.
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 CDD; cd09907; H3TH_FEN1-Euk; 1.
DR CDD; cd09867; PIN_FEN1; 1.
DR Gene3D; 1.10.150.20; 5' to 3' exonuclease, C-terminal subdomain; 1.
DR Gene3D; 3.40.50.1010; 5'-nuclease; 1.
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; IPR006085; XPG_DNA_repair_N.
DR PANTHER; PTHR11081:SF9; FLAP ENDONUCLEASE 1; 1.
DR PANTHER; PTHR11081; FLAP ENDONUCLEASE FAMILY MEMBER; 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; 5' to 3' exonuclease, C-terminal subdomain; 1.
DR SUPFAM; SSF88723; PIN domain-like; 1.
PE 3: Inferred from homology;
KW DNA damage; DNA repair; DNA replication; Endonuclease; Exonuclease;
KW Hydrolase; Magnesium; Metal-binding; Mitochondrion; Nuclease; Nucleus;
KW Phosphoprotein; Reference proteome.
FT CHAIN 1..358
FT /note="Flap endonuclease 1"
FT /id="PRO_0000403578"
FT REGION 1..103
FT /note="N-domain"
FT REGION 121..252
FT /note="I-domain"
FT REGION 346..354
FT /note="Interaction with PCNA"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
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 69
FT /ligand="DNA"
FT /ligand_id="ChEBI:CHEBI:16991"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT BINDING 85
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT BINDING 157
FT /ligand="DNA"
FT /ligand_id="ChEBI:CHEBI:16991"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT BINDING 157
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT BINDING 159
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT BINDING 178
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT BINDING 180
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT BINDING 230
FT /ligand="DNA"
FT /ligand_id="ChEBI:CHEBI:16991"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT BINDING 232
FT /ligand="DNA"
FT /ligand_id="ChEBI:CHEBI:16991"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
FT BINDING 232
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_03140"
SQ SEQUENCE 358 AA; 41150 MW; 313F6E64CD6B5D64 CRC64;
MGIKRLSKLI KTYCSEGVQN RELKYYSGYK IAIDASMCIY QFLVAVRAEG QSLSWGDSTT
SHISGIFYRS IRWIENGIIP VFVFDGIPPE EKIHEFEKRT KRRQDINAKL QDAIEQQDQV
LVSKYDRMNV KMEKSHIEEC QKTLRLLNIP YVIAPSEAEA YCAWLCKSKF VDAVATEDMD
SLCFGSPLLL RNFNTALSQK LPVEEYNLHK ILEGLQFTME QFVDLCILLG CDYSATIRGV
GMKRAFEYIK KYKSIDNLIG IVDFPDDFKY KEARTIFFTL GTDTSNNFTN ENPINTNIAT
WDLIAVDSAS INIEAVIDFL CNEKGFDKGR IETGIKKLQK QKKVNKQTRI DSFFKKKL
//
