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Entry: A0A1C5JQ54_9ACTN
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ID   A0A1C5JQ54_9ACTN        Unreviewed;       314 AA.
AC   A0A1C5JQ54;
DT   02-NOV-2016, integrated into UniProtKB/TrEMBL.
DT   02-NOV-2016, sequence version 1.
DT   24-JAN-2024, entry version 25.
DE   RecName: Full=Beta-ketoacyl-[acyl-carrier-protein] synthase III {ECO:0000256|HAMAP-Rule:MF_01815};
DE            Short=Beta-ketoacyl-ACP synthase III {ECO:0000256|HAMAP-Rule:MF_01815};
DE            Short=KAS III {ECO:0000256|HAMAP-Rule:MF_01815};
DE            EC=2.3.1.180 {ECO:0000256|HAMAP-Rule:MF_01815};
DE   AltName: Full=3-oxoacyl-[acyl-carrier-protein] synthase 3 {ECO:0000256|HAMAP-Rule:MF_01815};
DE   AltName: Full=3-oxoacyl-[acyl-carrier-protein] synthase III {ECO:0000256|HAMAP-Rule:MF_01815};
GN   Name=fabH {ECO:0000256|HAMAP-Rule:MF_01815};
GN   ORFNames=GA0074704_4792 {ECO:0000313|EMBL:SCG72637.1};
OS   Micromonospora siamensis.
OC   Bacteria; Actinomycetota; Actinomycetes; Micromonosporales;
OC   Micromonosporaceae; Micromonospora.
OX   NCBI_TaxID=299152 {ECO:0000313|EMBL:SCG72637.1, ECO:0000313|Proteomes:UP000198210};
RN   [1] {ECO:0000313|EMBL:SCG72637.1, ECO:0000313|Proteomes:UP000198210}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=DSM 45097 {ECO:0000313|EMBL:SCG72637.1,
RC   ECO:0000313|Proteomes:UP000198210};
RA   Kjaerup R.B., Dalgaard T.S., Juul-Madsen H.R.;
RL   Submitted (JUN-2016) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Catalyzes the condensation reaction of fatty acid synthesis
CC       by the addition to an acyl acceptor of two carbons from malonyl-ACP.
CC       Catalyzes the first condensation reaction which initiates fatty acid
CC       synthesis and may therefore play a role in governing the total rate of
CC       fatty acid production. Possesses both acetoacetyl-ACP synthase and
CC       acetyl transacylase activities. Its substrate specificity determines
CC       the biosynthesis of branched-chain and/or straight-chain of fatty
CC       acids. {ECO:0000256|HAMAP-Rule:MF_01815}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=acetyl-CoA + H(+) + malonyl-[ACP] = 3-oxobutanoyl-[ACP] + CO2
CC         + CoA; Xref=Rhea:RHEA:12080, Rhea:RHEA-COMP:9623, Rhea:RHEA-
CC         COMP:9625, ChEBI:CHEBI:15378, ChEBI:CHEBI:16526, ChEBI:CHEBI:57287,
CC         ChEBI:CHEBI:57288, ChEBI:CHEBI:78449, ChEBI:CHEBI:78450;
CC         EC=2.3.1.180; Evidence={ECO:0000256|HAMAP-Rule:MF_01815};
CC   -!- PATHWAY: Lipid metabolism; fatty acid biosynthesis. {ECO:0000256|HAMAP-
CC       Rule:MF_01815}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000256|HAMAP-Rule:MF_01815}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000256|HAMAP-Rule:MF_01815}.
CC   -!- DOMAIN: The last Arg residue of the ACP-binding site is essential for
CC       the weak association between ACP/AcpP and FabH. {ECO:0000256|HAMAP-
CC       Rule:MF_01815}.
CC   -!- SIMILARITY: Belongs to the thiolase-like superfamily. FabH family.
CC       {ECO:0000256|ARBA:ARBA00008642, ECO:0000256|HAMAP-Rule:MF_01815}.
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DR   EMBL; LT607751; SCG72637.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0A1C5JQ54; -.
DR   UniPathway; UPA00094; -.
DR   Proteomes; UP000198210; Chromosome i.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0004315; F:3-oxoacyl-[acyl-carrier-protein] synthase activity; IEA:InterPro.
DR   GO; GO:0033818; F:beta-ketoacyl-acyl-carrier-protein synthase III activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006633; P:fatty acid biosynthetic process; IEA:UniProtKB-UniRule.
DR   CDD; cd00830; KAS_III; 1.
DR   Gene3D; 3.40.47.10; -; 1.
DR   HAMAP; MF_01815; FabH; 1.
DR   InterPro; IPR013747; ACP_syn_III_C.
DR   InterPro; IPR013751; ACP_syn_III_N.
DR   InterPro; IPR004655; FabH.
DR   InterPro; IPR016039; Thiolase-like.
DR   NCBIfam; TIGR00747; fabH; 1.
DR   PANTHER; PTHR43091; 3-OXOACYL-[ACYL-CARRIER-PROTEIN] SYNTHASE; 1.
DR   PANTHER; PTHR43091:SF1; 3-OXOACYL-[ACYL-CARRIER-PROTEIN] SYNTHASE III, CHLOROPLASTIC; 1.
DR   Pfam; PF08545; ACP_syn_III; 1.
DR   Pfam; PF08541; ACP_syn_III_C; 1.
DR   SUPFAM; SSF53901; Thiolase-like; 1.
PE   3: Inferred from homology;
KW   Acyltransferase {ECO:0000256|HAMAP-Rule:MF_01815};
KW   Cytoplasm {ECO:0000256|HAMAP-Rule:MF_01815};
KW   Fatty acid biosynthesis {ECO:0000256|ARBA:ARBA00023160, ECO:0000256|HAMAP-
KW   Rule:MF_01815};
KW   Fatty acid metabolism {ECO:0000256|ARBA:ARBA00022832, ECO:0000256|HAMAP-
KW   Rule:MF_01815};
KW   Lipid biosynthesis {ECO:0000256|ARBA:ARBA00022516, ECO:0000256|HAMAP-
KW   Rule:MF_01815};
KW   Lipid metabolism {ECO:0000256|ARBA:ARBA00023098, ECO:0000256|HAMAP-
KW   Rule:MF_01815}; Multifunctional enzyme {ECO:0000256|HAMAP-Rule:MF_01815};
KW   Reference proteome {ECO:0000313|Proteomes:UP000198210};
KW   Transferase {ECO:0000256|ARBA:ARBA00022679, ECO:0000256|HAMAP-
KW   Rule:MF_01815}.
FT   DOMAIN          106..183
FT                   /note="Beta-ketoacyl-[acyl-carrier-protein] synthase III N-
FT                   terminal"
FT                   /evidence="ECO:0000259|Pfam:PF08545"
FT   DOMAIN          224..312
FT                   /note="Beta-ketoacyl-[acyl-carrier-protein] synthase III C-
FT                   terminal"
FT                   /evidence="ECO:0000259|Pfam:PF08541"
FT   REGION          241..245
FT                   /note="ACP-binding"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01815"
FT   ACT_SITE        112
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01815"
FT   ACT_SITE        240
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01815"
FT   ACT_SITE        270
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01815"
SQ   SEQUENCE   314 AA;  32330 MW;  C504967EE470C3D2 CRC64;
     MTGSRIVALG HYQPSRVVTN DDLAQLVDTN DEWIRDRVGI VTRRIAGDET VADMAAAAAG
     KALANSGLTA ADIDLVVVAT CTSVDRSPNV ACRVAAKLGI TAPAAYDVNT ACSGFAYALG
     TVDHAIRAGA ARNAIVVGAE KLSDFTDWTD RSTCIIFGDG AGAAVVTATA DGEPAGVGPV
     VWGSVPEKSD AVRIEGWRPY IAQEGQAVFR WATTALAPLA LQACEKAGVA PSELAAFVPH
     QANARIIDGI VKRLNIPNAV IAKDIVESGN TSAASVPLAL SKLVERREVP AGAPVLLFGF
     GGGLTYAGQV VRCP
//
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