ID   FABI_SYNY3              Reviewed;         258 AA.
AC   P73016;
DT   30-MAY-2000, integrated into UniProtKB/Swiss-Prot.
DT   30-MAY-2000, sequence version 2.
DT   10-JUN-2026, entry version 149.
DE   RecName: Full=Enoyl-[acyl-carrier-protein] reductase [NADH] FabI;
DE            Short=ENR;
DE            EC=1.3.1.9;
DE   AltName: Full=NADH-dependent enoyl-ACP reductase;
GN   Name=fabI; Synonyms=envM; OrderedLocusNames=slr1051;
OS   Synechocystis sp. (strain ATCC 27184 / PCC 6803 / Kazusa).
OC   Bacteria; Bacillati; Cyanobacteriota; Cyanophyceae; Synechococcales;
OC   Merismopediaceae; Synechocystis.
OX   NCBI_TaxID=1111708;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 27184 / PCC 6803 / Kazusa;
RX   PubMed=8905231; DOI=10.1093/dnares/3.3.109;
RA   Kaneko T., Sato S., Kotani H., Tanaka A., Asamizu E., Nakamura Y.,
RA   Miyajima N., Hirosawa M., Sugiura M., Sasamoto S., Kimura T., Hosouchi T.,
RA   Matsuno A., Muraki A., Nakazaki N., Naruo K., Okumura S., Shimpo S.,
RA   Takeuchi C., Wada T., Watanabe A., Yamada M., Yasuda M., Tabata S.;
RT   "Sequence analysis of the genome of the unicellular cyanobacterium
RT   Synechocystis sp. strain PCC6803. II. Sequence determination of the entire
RT   genome and assignment of potential protein-coding regions.";
RL   DNA Res. 3:109-136(1996).
CC   -!- FUNCTION: Catalyzes the reduction of a carbon-carbon double bond in an
CC       enoyl moiety that is covalently linked to an acyl carrier protein
CC       (ACP). Involved in the elongation cycle of fatty acid which are used in
CC       the lipid metabolism (By similarity). {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a 2,3-saturated acyl-[ACP] + NAD(+) = a (2E)-enoyl-[ACP] +
CC         NADH + H(+); Xref=Rhea:RHEA:10240, Rhea:RHEA-COMP:9925, Rhea:RHEA-
CC         COMP:9926, ChEBI:CHEBI:15378, ChEBI:CHEBI:57540, ChEBI:CHEBI:57945,
CC         ChEBI:CHEBI:78784, ChEBI:CHEBI:78785; EC=1.3.1.9;
CC   -!- PATHWAY: Lipid metabolism; fatty acid biosynthesis.
CC   -!- SUBUNIT: Homotetramer. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the short-chain dehydrogenases/reductases (SDR)
CC       family. FabI subfamily. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=BAA17036.1; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};
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DR   EMBL; BA000022; BAA17036.1; ALT_INIT; Genomic_DNA.
DR   PIR; S74996; S74996.
DR   AlphaFoldDB; P73016; -.
DR   SMR; P73016; -.
DR   FunCoup; P73016; 365.
DR   STRING; 1148.gene:10497897; -.
DR   PaxDb; 1148-gene:10497897; -.
DR   EnsemblBacteria; BAA17036; BAA17036; BAA17036.
DR   KEGG; syn:slr1051; -.
DR   eggNOG; COG0623; Bacteria.
DR   InParanoid; P73016; -.
DR   PhylomeDB; P73016; -.
DR   UniPathway; UPA00094; -.
DR   Proteomes; UP000001425; Chromosome.
DR   GO; GO:0004318; F:enoyl-[acyl-carrier-protein] reductase (NADH) activity; ISS:UniProtKB.
DR   GO; GO:0042802; F:identical protein binding; ISS:UniProtKB.
DR   GO; GO:0050661; F:NADP binding; IEA:UniProtKB-ARBA.
DR   GO; GO:0030497; P:fatty acid elongation; ISS:UniProtKB.
DR   CDD; cd05372; ENR_SDR; 1.
DR   FunFam; 1.10.8.400:FF:000001; Enoyl-[acyl-carrier-protein] reductase [NADH]; 1.
DR   FunFam; 3.40.50.720:FF:000169; Enoyl-[acyl-carrier-protein] reductase [NADH]; 1.
DR   Gene3D; 1.10.8.400; Enoyl acyl carrier protein reductase; 1.
DR   Gene3D; 3.40.50.720; NAD(P)-binding Rossmann-like Domain; 1.
DR   InterPro; IPR014358; Enoyl-ACP_Rdtase_NADH.
DR   InterPro; IPR036291; NAD(P)-bd_dom_sf.
DR   InterPro; IPR002347; SDR_fam.
DR   NCBIfam; NF005615; PRK07370.1; 1.
DR   PANTHER; PTHR43159; ENOYL-[ACYL-CARRIER-PROTEIN] REDUCTASE; 1.
DR   PANTHER; PTHR43159:SF2; ENOYL-[ACYL-CARRIER-PROTEIN] REDUCTASE [NADH], CHLOROPLASTIC; 1.
DR   Pfam; PF13561; adh_short_C2; 1.
DR   PIRSF; PIRSF000094; Enoyl-ACP_rdct; 1.
DR   PRINTS; PR00081; GDHRDH.
DR   SUPFAM; SSF51735; NAD(P)-binding Rossmann-fold domains; 1.
PE   3: Inferred from homology;
KW   Fatty acid biosynthesis; Fatty acid metabolism; Lipid biosynthesis;
KW   Lipid metabolism; NAD; Oxidoreductase; Reference proteome.
FT   CHAIN           1..258
FT                   /note="Enoyl-[acyl-carrier-protein] reductase [NADH] FabI"
FT                   /id="PRO_0000054912"
FT   ACT_SITE        148
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        158
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000250"
FT   BINDING         13
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         19..20
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         67..68
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         95
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         98
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         165
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         194..198
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   258 AA;  27626 MW;  E912F0DF124FAE49 CRC64;
     MLDLSGKHAF VTGIANNRSI AWGIAQQLHQ AGAEIGVSYL PDEKGRFEKK VRELTEPLHP
     TLVLPGDVQD DAQVDALFHS VKEKWGKLDI LIHCLAFADK SGLTGNYTDI PKEAFSQAME
     ISTYSLGRLA RGAKPLMTNG GSIITLTYFG GVKVIPNYNL MGVAKAGLEM TVRYLAAELG
     PQNIRVNGIS AGPIRTLASS AVGGILDMIH HVEEVAPLKR TVTQTEVGNT AAFLASDLSS
     GITGQIIYVD SGYEIMGM
//