ID   FABH_TROWT              Reviewed;         322 AA.
AC   P64116; Q83HL5; Q83N01;
DT   11-OCT-2004, integrated into UniProtKB/Swiss-Prot.
DT   11-OCT-2004, sequence version 1.
DT   25-MAY-2022, entry version 101.
DE   RecName: Full=3-oxoacyl-[acyl-carrier-protein] synthase 3;
DE            EC=2.3.1.180;
DE   AltName: Full=3-oxoacyl-[acyl-carrier-protein] synthase III;
DE   AltName: Full=Beta-ketoacyl-ACP synthase III;
DE            Short=KAS III;
GN   Name=fabH; OrderedLocusNames=TWT_253;
OS   Tropheryma whipplei (strain Twist) (Whipple's bacillus).
OC   Bacteria; Actinobacteria; Micrococcales; Tropherymataceae; Tropheryma.
OX   NCBI_TaxID=203267;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Twist;
RX   PubMed=12902375; DOI=10.1101/gr.1474603;
RA   Raoult D., Ogata H., Audic S., Robert C., Suhre K., Drancourt M.,
RA   Claverie J.-M.;
RT   "Tropheryma whipplei twist: a human pathogenic Actinobacteria with a
RT   reduced genome.";
RL   Genome Res. 13:1800-1809(2003).
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 acids
CC       (By similarity). {ECO:0000250}.
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;
CC   -!- PATHWAY: Lipid metabolism; fatty acid biosynthesis.
CC   -!- SUBUNIT: Homodimer. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250}.
CC   -!- DOMAIN: The last Arg residue of the ACP-binding site is essential for
CC       the weak association between ACP/AcpP and FabH. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the thiolase-like superfamily. FabH family.
CC       {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAO44350.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; AE014184; AAO44350.1; ALT_INIT; Genomic_DNA.
DR   AlphaFoldDB; P64116; -.
DR   SMR; P64116; -.
DR   STRING; 203267.TWT_253; -.
DR   EnsemblBacteria; AAO44350; AAO44350; TWT_253.
DR   KEGG; twh:TWT_253; -.
DR   eggNOG; COG0332; Bacteria.
DR   HOGENOM; CLU_039592_4_0_11; -.
DR   OMA; WGSEGDK; -.
DR   UniPathway; UPA00094; -.
DR   Proteomes; UP000002200; Chromosome.
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-EC.
DR   GO; GO:0006633; P:fatty acid biosynthetic process; IEA:UniProtKB-UniPathway.
DR   Gene3D; 3.40.47.10; -; 2.
DR   InterPro; IPR013751; ACP_syn_III.
DR   InterPro; IPR013747; ACP_syn_III_C.
DR   InterPro; IPR016039; Thiolase-like.
DR   Pfam; PF08545; ACP_syn_III; 1.
DR   Pfam; PF08541; ACP_syn_III_C; 1.
DR   SUPFAM; SSF53901; SSF53901; 1.
PE   3: Inferred from homology;
KW   Acyltransferase; Cytoplasm; Fatty acid biosynthesis; Fatty acid metabolism;
KW   Lipid biosynthesis; Lipid metabolism; Multifunctional enzyme;
KW   Reference proteome; Transferase.
FT   CHAIN           1..322
FT                   /note="3-oxoacyl-[acyl-carrier-protein] synthase 3"
FT                   /id="PRO_0000110500"
FT   REGION          248..252
FT                   /note="ACP-binding"
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        113
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        247
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        278
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   322 AA;  34211 MW;  3A2A1E592BDF1804 CRC64;
     MRYSKIVSLG AYRGERDVYN DELIGPINSS DEWIRRRTGI ISRKRALSGT TVVDMAYAAS
     KEALNDAQMR PEDIDLILVA TITHFGHTPS VAAHVGFRIG VQDAILLDIN AACAGFSYAI
     FQADLMIKSG VASRALVIGV DKLSEFIDPL DRTISFLLAD GAGAAILVGS TSMGIGKTVC
     GGNPGQLESV GLTGSTTDVK SGSAWPTLRQ EGSSIFRWAV WQMAKVAKQI LDINQVQPGD
     LNAFIPHQAN IRIIDELAKQ IGLEENVLIA QDICKTGNTS SASIPLAMHS LIKGNPSLSG
     ELALQIGFGA GLVYAGQTVV MP