ID   METAA_CERS1             Reviewed;         305 AA.
AC   A3PK84;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   03-APR-2007, sequence version 1.
DT   03-AUG-2022, entry version 76.
DE   RecName: Full=Homoserine O-acetyltransferase {ECO:0000255|HAMAP-Rule:MF_00295};
DE            Short=HAT {ECO:0000255|HAMAP-Rule:MF_00295};
DE            EC=2.3.1.31 {ECO:0000255|HAMAP-Rule:MF_00295};
DE   AltName: Full=Homoserine transacetylase {ECO:0000255|HAMAP-Rule:MF_00295};
DE            Short=HTA {ECO:0000255|HAMAP-Rule:MF_00295};
GN   Name=metAA {ECO:0000255|HAMAP-Rule:MF_00295};
GN   OrderedLocusNames=Rsph17029_1640;
OS   Cereibacter sphaeroides (strain ATCC 17029 / ATH 2.4.9) (Rhodobacter
OS   sphaeroides).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rhodobacterales;
OC   Rhodobacteraceae; Cereibacter.
OX   NCBI_TaxID=349101;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 17029 / ATH 2.4.9;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C.,
RA   Glavina del Rio T., Hammon N., Israni S., Dalin E., Tice H., Pitluck S.,
RA   Kiss H., Brettin T., Bruce D., Han C., Tapia R., Gilna P., Schmutz J.,
RA   Larimer F., Land M., Hauser L., Kyrpides N., Mikhailova N., Richardson P.,
RA   Mackenzie C., Choudhary M., Donohue T.J., Kaplan S.;
RT   "Complete sequence of chromosome 1 of Rhodobacter sphaeroides ATCC 17029.";
RL   Submitted (FEB-2007) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Transfers an acetyl group from acetyl-CoA to L-homoserine,
CC       forming acetyl-L-homoserine. {ECO:0000255|HAMAP-Rule:MF_00295}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=acetyl-CoA + L-homoserine = CoA + O-acetyl-L-homoserine;
CC         Xref=Rhea:RHEA:13701, ChEBI:CHEBI:57287, ChEBI:CHEBI:57288,
CC         ChEBI:CHEBI:57476, ChEBI:CHEBI:57716; EC=2.3.1.31;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00295};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-methionine biosynthesis via de novo
CC       pathway; O-acetyl-L-homoserine from L-homoserine: step 1/1.
CC       {ECO:0000255|HAMAP-Rule:MF_00295}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00295}.
CC   -!- SIMILARITY: Belongs to the MetA family. {ECO:0000255|HAMAP-
CC       Rule:MF_00295}.
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DR   EMBL; CP000577; ABN76750.1; -; Genomic_DNA.
DR   RefSeq; WP_011337925.1; NC_009049.1.
DR   AlphaFoldDB; A3PK84; -.
DR   SMR; A3PK84; -.
DR   EnsemblBacteria; ABN76750; ABN76750; Rsph17029_1640.
DR   GeneID; 57470320; -.
DR   KEGG; rsh:Rsph17029_1640; -.
DR   HOGENOM; CLU_057851_0_1_5; -.
DR   OMA; WLWFCYQ; -.
DR   UniPathway; UPA00051; UER00074.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0004414; F:homoserine O-acetyltransferase activity; IEA:UniProtKB-EC.
DR   GO; GO:0008899; F:homoserine O-succinyltransferase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0019281; P:L-methionine biosynthetic process from homoserine via O-succinyl-L-homoserine and cystathionine; IEA:InterPro.
DR   CDD; cd03131; GATase1_HTS; 1.
DR   Gene3D; 3.40.50.880; -; 1.
DR   HAMAP; MF_00295; MetA_acyltransf; 1.
DR   InterPro; IPR029062; Class_I_gatase-like.
DR   InterPro; IPR005697; HST_MetA.
DR   InterPro; IPR033752; MetA_family.
DR   PANTHER; PTHR20919; PTHR20919; 1.
DR   Pfam; PF04204; HTS; 1.
DR   PIRSF; PIRSF000450; H_ser_succinyltr; 1.
DR   SUPFAM; SSF52317; SSF52317; 1.
DR   TIGRFAMs; TIGR01001; metA; 1.
PE   3: Inferred from homology;
KW   Acyltransferase; Amino-acid biosynthesis; Cytoplasm;
KW   Methionine biosynthesis; Transferase.
FT   CHAIN           1..305
FT                   /note="Homoserine O-acetyltransferase"
FT                   /id="PRO_1000021826"
FT   ACT_SITE        142
FT                   /note="Acyl-thioester intermediate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00295"
FT   ACT_SITE        235
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00295"
FT   ACT_SITE        237
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00295"
FT   BINDING         163
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00295"
FT   BINDING         192
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00295"
FT   BINDING         249
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00295"
FT   SITE            111
FT                   /note="Important for acyl-CoA specificity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00295"
FT   SITE            192
FT                   /note="Important for substrate specificity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00295"
SQ   SEQUENCE   305 AA;  35171 MW;  C84F0996E07FBFF1 CRC64;
     MPITLPATLP AFDVLTHEGV MVMTPERAAR QDIRPLRIGL LNLMPKKIQT ENQFARLIGA
     TPLQIDFQLI RMTEHQTKNT AAEHMEAFYR PFQEVKHEKF DGLIITGAPI EHLDFADVTY
     WDELCEVMDW TQTNVQSTFG VCWGGMAMIY HFHRVQKHRL QAKAFGCFRH RNVAPTSPYL
     RGFSDDFVIP VSRWTEMRQA EIDAAPGLRT LLASDEAGPC LVEDPGHRAL YIFNHFEYDS
     DTLKQEYDRD VANGKPINVP ANYYPDDDPS KPPLNRWRSH AHLLYGNWIN EIYQSTPYDP
     QQIGR