ID   Q3AEQ8_CARHZ            Unreviewed;       170 AA.
AC   Q3AEQ8;
DT   22-NOV-2005, integrated into UniProtKB/TrEMBL.
DT   22-NOV-2005, sequence version 1.
DT   27-MAR-2024, entry version 94.
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   Name=ilvN1 {ECO:0000313|EMBL:ABB14305.1};
GN   OrderedLocusNames=CHY_0518 {ECO:0000313|EMBL:ABB14305.1};
OS   Carboxydothermus hydrogenoformans (strain ATCC BAA-161 / DSM 6008 /
OS   Z-2901).
OC   Bacteria; Bacillota; Clostridia; Thermoanaerobacterales;
OC   Thermoanaerobacteraceae; Carboxydothermus.
OX   NCBI_TaxID=246194 {ECO:0000313|EMBL:ABB14305.1, ECO:0000313|Proteomes:UP000002706};
RN   [1] {ECO:0000313|EMBL:ABB14305.1, ECO:0000313|Proteomes:UP000002706}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-161 / DSM 6008 / Z-2901
RC   {ECO:0000313|Proteomes:UP000002706};
RX   PubMed=16311624; DOI=10.1371/journal.pgen.0010065;
RA   Wu M., Ren Q., Durkin A.S., Daugherty S.C., Brinkac L.M., Dodson R.J.,
RA   Madupu R., Sullivan S.A., Kolonay J.F., Haft D.H., Nelson W.C.,
RA   Tallon L.J., Jones K.M., Ulrich L.E., Gonzalez J.M., Zhulin I.B.,
RA   Robb F.T., Eisen J.A.;
RT   "Life in hot carbon monoxide: the complete genome sequence of
RT   Carboxydothermus hydrogenoformans Z-2901.";
RL   PLoS Genet. 1:563-574(2005).
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; CP000141; ABB14305.1; -; Genomic_DNA.
DR   RefSeq; WP_011343452.1; NC_007503.1.
DR   AlphaFoldDB; Q3AEQ8; -.
DR   STRING; 246194.CHY_0518; -.
DR   KEGG; chy:CHY_0518; -.
DR   eggNOG; COG0440; Bacteria.
DR   HOGENOM; CLU_055003_1_3_9; -.
DR   InParanoid; Q3AEQ8; -.
DR   OrthoDB; 9787365at2; -.
DR   UniPathway; UPA00047; UER00055.
DR   UniPathway; UPA00049; UER00059.
DR   Proteomes; UP000002706; 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; PF13710; ACT_5; 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};
KW   Reference proteome {ECO:0000313|Proteomes:UP000002706};
KW   Transferase {ECO:0000256|RuleBase:RU368092, ECO:0000313|EMBL:ABB14305.1}.
FT   DOMAIN          4..78
FT                   /note="ACT"
FT                   /evidence="ECO:0000259|PROSITE:PS51671"
SQ   SEQUENCE   170 AA;  18986 MW;  AE841EACBECA1FBE CRC64;
     MRHTLAVLVE NNPGVLARVA GLFSRRGYNI DSLAVGRTEN PDISRMTIVV EGDDRVLEQV
     VKQLRKLVDV IKVQDITSEQ YVSRELLLLK VHADSNTRGE IMQIVEIFRA RIVDIGPKTL
     TIEATGDEDK IEAIENALRP FGIKELVRTG KIALLRGSRT SNINGVKEEE
//