ID   B1LZA0_METRJ            Unreviewed;       335 AA.
AC   B1LZA0;
DT   29-APR-2008, integrated into UniProtKB/TrEMBL.
DT   29-APR-2008, sequence version 1.
DT   27-MAR-2024, entry version 95.
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   OrderedLocusNames=Mrad2831_3968 {ECO:0000313|EMBL:ACB25942.1};
OS   Methylobacterium radiotolerans (strain ATCC 27329 / DSM 1819 / JCM 2831 /
OS   NBRC 15690 / NCIMB 10815 / 0-1).
OC   Bacteria; Pseudomonadota; Alphaproteobacteria; Hyphomicrobiales;
OC   Methylobacteriaceae; Methylobacterium.
OX   NCBI_TaxID=426355 {ECO:0000313|EMBL:ACB25942.1, ECO:0000313|Proteomes:UP000006589};
RN   [1] {ECO:0000313|EMBL:ACB25942.1, ECO:0000313|Proteomes:UP000006589}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 27329 / DSM 1819 / JCM 2831 / NBRC 15690 / NCIMB 10815 /
RC   0-1 {ECO:0000313|Proteomes:UP000006589};
RG   US DOE Joint Genome Institute;
RA   Copeland A., Lucas S., Lapidus A., Glavina del Rio T., Dalin E., Tice H.,
RA   Bruce D., Goodwin L., Pitluck S., Kiss H., Brettin T., Detter J.C., Han C.,
RA   Kuske C.R., Schmutz J., Larimer F., Land M., Hauser L., Kyrpides N.,
RA   Mikhailova N., Marx C.J., Richardson P.;
RT   "Complete sequence of chromosome of Methylobacterium radiotolerans JCM
RT   2831.";
RL   Submitted (MAR-2008) 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; CP001001; ACB25942.1; -; Genomic_DNA.
DR   RefSeq; WP_012320899.1; NC_010505.1.
DR   AlphaFoldDB; B1LZA0; -.
DR   STRING; 426355.Mrad2831_3968; -.
DR   KEGG; mrd:Mrad2831_3968; -.
DR   PATRIC; fig|426355.14.peg.4064; -.
DR   eggNOG; COG0332; Bacteria.
DR   HOGENOM; CLU_039592_3_1_5; -.
DR   OrthoDB; 9815506at2; -.
DR   UniPathway; UPA00094; -.
DR   Proteomes; UP000006589; 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   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; PTHR34069; 3-OXOACYL-[ACYL-CARRIER-PROTEIN] SYNTHASE 3; 1.
DR   PANTHER; PTHR34069:SF2; BETA-KETOACYL-[ACYL-CARRIER-PROTEIN] SYNTHASE III; 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   ECO:0000313|EMBL:ACB25942.1};
KW   Cytoplasm {ECO:0000256|ARBA:ARBA00022490, 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   Transferase {ECO:0000256|ARBA:ARBA00022679, ECO:0000256|HAMAP-
KW   Rule:MF_01815}.
FT   DOMAIN          122..202
FT                   /note="Beta-ketoacyl-[acyl-carrier-protein] synthase III N-
FT                   terminal"
FT                   /evidence="ECO:0000259|Pfam:PF08545"
FT   DOMAIN          247..335
FT                   /note="Beta-ketoacyl-[acyl-carrier-protein] synthase III C-
FT                   terminal"
FT                   /evidence="ECO:0000259|Pfam:PF08541"
FT   REGION          263..267
FT                   /note="ACP-binding"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01815"
FT   ACT_SITE        128
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01815"
FT   ACT_SITE        262
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01815"
FT   ACT_SITE        292
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01815"
SQ   SEQUENCE   335 AA;  35471 MW;  F2251D22DA37780E CRC64;
     MATLRTDPGQ HRRVPPLRSV VVGTGSSLPA RVVTNADLAE RVDTSDEWIV QRTGIRQRHL
     AGPDETTSVL GTRAARAALD DAGLTADDID LVICATSTPD HTFPATATQI QAALGIHQGA
     AFDLQAVCAG FVFAVSTADK FLTTGAARRA LVIGAETFSR IVDWEDRTTC VLFGDGAGAV
     VLEAQEGAGD RGVLSASLRS DGRHREKLYV DGGPGSTGTT GHLRMEGRDV FRFAVGQVTD
     VIVEAFAQAG ITAEELDWFV PHQANRRIIE ASADKLGVAR DKIVLTVDRH GNTSAASIPL
     ALDVARRDGR IRAGDLVMIE AIGGGFSWGA ALIRW
//