FABH_HAEIG
ID FABH_HAEIG Reviewed; 316 AA.
AC A5UFW1;
DT 15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT 10-JUL-2007, sequence version 1.
DT 25-MAY-2022, entry version 76.
DE RecName: Full=3-oxoacyl-[acyl-carrier-protein] synthase 3 {ECO:0000255|HAMAP-Rule:MF_01815};
DE EC=2.3.1.180 {ECO:0000255|HAMAP-Rule:MF_01815};
DE AltName: Full=3-oxoacyl-[acyl-carrier-protein] synthase III {ECO:0000255|HAMAP-Rule:MF_01815};
DE AltName: Full=Beta-ketoacyl-ACP synthase III {ECO:0000255|HAMAP-Rule:MF_01815};
DE Short=KAS III {ECO:0000255|HAMAP-Rule:MF_01815};
GN Name=fabH {ECO:0000255|HAMAP-Rule:MF_01815};
GN OrderedLocusNames=CGSHiGG_03380;
OS Haemophilus influenzae (strain PittGG).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Pasteurellales;
OC Pasteurellaceae; Haemophilus.
OX NCBI_TaxID=374931;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=PittGG;
RX PubMed=17550610; DOI=10.1186/gb-2007-8-6-r103;
RA Hogg J.S., Hu F.Z., Janto B., Boissy R., Hayes J., Keefe R., Post J.C.,
RA Ehrlich G.D.;
RT "Characterization and modeling of the Haemophilus influenzae core and
RT supragenomes based on the complete genomic sequences of Rd and 12 clinical
RT nontypeable strains.";
RL Genome Biol. 8:R103.1-R103.18(2007).
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:0000255|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:0000255|HAMAP-Rule:MF_01815};
CC -!- PATHWAY: Lipid metabolism; fatty acid biosynthesis. {ECO:0000255|HAMAP-
CC Rule:MF_01815}.
CC -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_01815}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|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:0000255|HAMAP-
CC Rule:MF_01815}.
CC -!- SIMILARITY: Belongs to the thiolase-like superfamily. FabH family.
CC {ECO:0000255|HAMAP-Rule:MF_01815}.
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DR EMBL; CP000672; ABQ99666.1; -; Genomic_DNA.
DR RefSeq; WP_005691510.1; NC_009567.1.
DR AlphaFoldDB; A5UFW1; -.
DR SMR; A5UFW1; -.
DR EnsemblBacteria; ABQ99666; ABQ99666; CGSHiGG_03380.
DR KEGG; hiq:CGSHiGG_03380; -.
DR HOGENOM; CLU_039592_3_1_6; -.
DR OMA; WGSEGDK; -.
DR UniPathway; UPA00094; -.
DR Proteomes; UP000001990; 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-UniRule.
DR GO; GO:0006633; P:fatty acid biosynthetic process; IEA:UniProtKB-UniRule.
DR Gene3D; 3.40.47.10; -; 2.
DR HAMAP; MF_01815; FabH; 1.
DR InterPro; IPR013751; ACP_syn_III.
DR InterPro; IPR013747; ACP_syn_III_C.
DR InterPro; IPR004655; FabH_synth.
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.
DR TIGRFAMs; TIGR00747; fabH; 1.
PE 3: Inferred from homology;
KW Acyltransferase; Cytoplasm; Fatty acid biosynthesis; Fatty acid metabolism;
KW Lipid biosynthesis; Lipid metabolism; Multifunctional enzyme; Transferase.
FT CHAIN 1..316
FT /note="3-oxoacyl-[acyl-carrier-protein] synthase 3"
FT /id="PRO_1000056364"
FT REGION 244..248
FT /note="ACP-binding"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01815"
FT ACT_SITE 112
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01815"
FT ACT_SITE 243
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01815"
FT ACT_SITE 273
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01815"
SQ SEQUENCE 316 AA; 34280 MW; 2D00ADD61DCB6A66 CRC64;
MNSRILSTGS YLPSHIRTNA DLEKMVDTSD EWIVTRSGIR ERRIAAEDET VATMGFEAAK
NAIEAAQINP QDIELIIVAT TSHSHAYPSA ACQVQGLLNI DDAISFDLAA ACTGFVYALS
VADQFIRAGK VKKALVIGSD LNSRKLDETD RSTVVLFGDG AGAVILEASE QEGIISTHLH
ASADKNNALV LAQPERGIEK SGYIEMQGNE TFKLAVRELS NVVEETLLAN NLDKKDLDWL
VPHQANLRII TATAKKLEMD MSQVVVTLDK YANNSAATVP VALDEAIRDG RIQRGQLLLL
EAFGGGWTWG SALVRF
