ID   A9KQ66_LACP7            Unreviewed;       166 AA.
AC   A9KQ66;
DT   05-FEB-2008, integrated into UniProtKB/TrEMBL.
DT   05-FEB-2008, sequence version 1.
DT   27-MAR-2024, entry version 83.
DE   RecName: Full=Acetolactate synthase small subunit {ECO:0000256|RuleBase:RU368092};
DE            Short=AHAS {ECO:0000256|RuleBase:RU368092};
DE            Short=ALS {ECO:0000256|RuleBase:RU368092};
DE            EC=2.2.1.6 {ECO:0000256|RuleBase:RU368092};
DE   AltName: Full=Acetohydroxy-acid synthase small subunit {ECO:0000256|RuleBase:RU368092};
GN   OrderedLocusNames=Cphy_3021 {ECO:0000313|EMBL:ABX43378.1};
OS   Lachnoclostridium phytofermentans (strain ATCC 700394 / DSM 18823 / ISDg)
OS   (Clostridium phytofermentans).
OC   Bacteria; Bacillota; Clostridia; Eubacteriales; Lachnospiraceae.
OX   NCBI_TaxID=357809 {ECO:0000313|EMBL:ABX43378.1, ECO:0000313|Proteomes:UP000000370};
RN   [1] {ECO:0000313|Proteomes:UP000000370}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700394 / DSM 18823 / ISDg
RC   {ECO:0000313|Proteomes:UP000000370};
RA   Leschine S.B., Warnick T.A., Blanchard J.L., Schnell D.J., Petit E.L.,
RA   LaTouf W.G., Copeland A., Lucas S., Lapidus A., Barry K.,
RA   Glavina del Rio T., Dalin E., Tice H., Pitluck S., Kiss H., Brettin T.,
RA   Bruce D., Detter J.C., Han C., Kuske C., Schmutz J., Larimer F., Land M.,
RA   Hauser L., Kyrpides N., Kim E.A., Richardson P.;
RT   "Complete genome sequence of Clostridium phytofermentans ISDg.";
RL   Submitted (NOV-2007) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Catalyzes the conversion of 2 pyruvate molecules into
CC       acetolactate in the first common step of the biosynthetic pathway of
CC       the branched-amino acids such as leucine, isoleucine, and valine.
CC       {ECO:0000256|RuleBase:RU368092}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=H(+) + 2 pyruvate = (2S)-2-acetolactate + CO2;
CC         Xref=Rhea:RHEA:25249, ChEBI:CHEBI:15361, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:16526, ChEBI:CHEBI:58476; EC=2.2.1.6;
CC         Evidence={ECO:0000256|ARBA:ARBA00000673,
CC         ECO:0000256|RuleBase:RU368092};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-isoleucine biosynthesis; L-
CC       isoleucine from 2-oxobutanoate: step 1/4.
CC       {ECO:0000256|ARBA:ARBA00004974, ECO:0000256|RuleBase:RU368092}.
CC   -!- PATHWAY: Amino-acid biosynthesis; L-valine biosynthesis; L-valine from
CC       pyruvate: step 1/4. {ECO:0000256|ARBA:ARBA00005025,
CC       ECO:0000256|RuleBase:RU368092}.
CC   -!- SUBUNIT: Dimer of large and small chains.
CC       {ECO:0000256|ARBA:ARBA00011744, ECO:0000256|RuleBase:RU368092}.
CC   -!- SIMILARITY: Belongs to the acetolactate synthase small subunit family.
CC       {ECO:0000256|ARBA:ARBA00006341, ECO:0000256|RuleBase:RU368092}.
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DR   EMBL; CP000885; ABX43378.1; -; Genomic_DNA.
DR   RefSeq; WP_012201029.1; NC_010001.1.
DR   AlphaFoldDB; A9KQ66; -.
DR   STRING; 357809.Cphy_3021; -.
DR   KEGG; cpy:Cphy_3021; -.
DR   eggNOG; COG0440; Bacteria.
DR   HOGENOM; CLU_055003_1_3_9; -.
DR   OrthoDB; 9787365at2; -.
DR   UniPathway; UPA00047; UER00055.
DR   UniPathway; UPA00049; UER00059.
DR   Proteomes; UP000000370; Chromosome.
DR   GO; GO:0003984; F:acetolactate synthase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:1990610; F:acetolactate synthase regulator activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0009097; P:isoleucine biosynthetic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0009099; P:valine biosynthetic process; IEA:UniProtKB-UniRule.
DR   CDD; cd04878; ACT_AHAS; 1.
DR   Gene3D; 3.30.70.260; -; 1.
DR   Gene3D; 3.30.70.1150; ACT-like. Chain A, domain 2; 1.
DR   InterPro; IPR004789; Acetalactate_synth_ssu.
DR   InterPro; IPR027271; Acetolactate_synth/TF_NikR_C.
DR   InterPro; IPR019455; Acetolactate_synth_ssu_C.
DR   InterPro; IPR045865; ACT-like_dom_sf.
DR   InterPro; IPR002912; ACT_dom.
DR   InterPro; IPR039557; AHAS_ACT.
DR   NCBIfam; TIGR00119; acolac_sm; 1.
DR   PANTHER; PTHR30239; ACETOLACTATE SYNTHASE SMALL SUBUNIT; 1.
DR   PANTHER; PTHR30239:SF0; ACETOLACTATE SYNTHASE SMALL SUBUNIT 1, CHLOROPLASTIC; 1.
DR   Pfam; PF01842; ACT; 1.
DR   Pfam; PF10369; ALS_ss_C; 1.
DR   SUPFAM; SSF55021; ACT-like; 2.
DR   PROSITE; PS51671; ACT; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis {ECO:0000256|ARBA:ARBA00022605,
KW   ECO:0000256|RuleBase:RU368092};
KW   Branched-chain amino acid biosynthesis {ECO:0000256|ARBA:ARBA00023304,
KW   ECO:0000256|RuleBase:RU368092}; Coiled coil {ECO:0000256|SAM:Coils};
KW   Reference proteome {ECO:0000313|Proteomes:UP000000370};
KW   Transferase {ECO:0000256|RuleBase:RU368092}.
FT   DOMAIN          5..82
FT                   /note="ACT"
FT                   /evidence="ECO:0000259|PROSITE:PS51671"
FT   COILED          51..78
FT                   /evidence="ECO:0000256|SAM:Coils"
SQ   SEQUENCE   166 AA;  18402 MW;  9F1380394979ADE9 CRC64;
     MRKMVLSILV ENTAGVLSRV SGLFSRRGYN IDSLTVGETE NPAFSRMTVV VNGEEQILEQ
     IRNQLQKLED IVEIKELHSE ESVCRELILV KVQAGESERK DVIAVADIFR AKIVDVAKES
     LMIELTGNQA KIDAFINLLD GFKILEIVRT GITGLPRGSG DIADYV
//