ID C0QDD2_DESAH Unreviewed; 166 AA.
AC C0QDD2;
DT 05-MAY-2009, integrated into UniProtKB/TrEMBL.
DT 05-MAY-2009, sequence version 1.
DT 27-MAR-2024, entry version 74.
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=ilvH {ECO:0000313|EMBL:ACN15196.1};
GN OrderedLocusNames=HRM2_20980 {ECO:0000313|EMBL:ACN15196.1};
OS Desulforapulum autotrophicum (strain ATCC 43914 / DSM 3382 / VKM B-1955 /
OS HRM2) (Desulfobacterium autotrophicum).
OC Bacteria; Thermodesulfobacteriota; Desulfobacteria; Desulfobacterales;
OC Desulfobacteraceae; Desulforapulum.
OX NCBI_TaxID=177437 {ECO:0000313|EMBL:ACN15196.1, ECO:0000313|Proteomes:UP000000442};
RN [1] {ECO:0000313|EMBL:ACN15196.1, ECO:0000313|Proteomes:UP000000442}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 43914 / DSM 3382 / HRM2
RC {ECO:0000313|Proteomes:UP000000442};
RX PubMed=19187283; DOI=10.1111/j.1462-2920.2008.01825.x;
RA Strittmatter A.W., Liesegang H., Rabus R., Decker I., Amann J., Andres S.,
RA Henne A., Fricke W.F., Martinez-Arias R., Bartels D., Goesmann A.,
RA Krause L., Puehler A., Klenk H.P., Richter M., Schuler M., Gloeckner F.O.,
RA Meyerdierks A., Gottschalk G., Amann R.;
RT "Genome sequence of Desulfobacterium autotrophicum HRM2, a marine sulfate
RT reducer oxidizing organic carbon completely to carbon dioxide.";
RL Environ. Microbiol. 11:1038-1055(2009).
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; CP001087; ACN15196.1; -; Genomic_DNA.
DR RefSeq; WP_015903967.1; NC_012108.1.
DR AlphaFoldDB; C0QDD2; -.
DR STRING; 177437.HRM2_20980; -.
DR KEGG; dat:HRM2_20980; -.
DR eggNOG; COG0440; Bacteria.
DR HOGENOM; CLU_055003_1_3_7; -.
DR OrthoDB; 9787365at2; -.
DR UniPathway; UPA00047; UER00055.
DR UniPathway; UPA00049; UER00059.
DR Proteomes; UP000000442; 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};
KW Reference proteome {ECO:0000313|Proteomes:UP000000442};
KW Transferase {ECO:0000256|RuleBase:RU368092, ECO:0000313|EMBL:ACN15196.1}.
FT DOMAIN 7..81
FT /note="ACT"
FT /evidence="ECO:0000259|PROSITE:PS51671"
SQ SEQUENCE 166 AA; 18681 MW; 76F3BB338C4349D8 CRC64;
MTIKKHILSI LVDNEPGVLS RIAGLFSGRG YNIDTLSVAQ TMESTASRVT METSGDEHIV
EQIIKQLHKL INVITVVDLT EKRHVKRELA LIKVHAKSEH RAEILRIVDI FRCRVVDVAQ
DYYTIEISGN EEKLMAIMDL LTPMGIIETA RTGSIALSRE KTTKRT
//
