ID R4YRP3_OLEAN Unreviewed; 167 AA.
AC R4YRP3;
DT 24-JUL-2013, integrated into UniProtKB/TrEMBL.
DT 24-JUL-2013, sequence version 1.
DT 27-MAR-2024, entry version 34.
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:CCK74779.1};
GN ORFNames=OLEAN_C06030 {ECO:0000313|EMBL:CCK74779.1};
OS Oleispira antarctica RB-8.
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Oceanospirillales;
OC Oceanospirillaceae; Oleispira.
OX NCBI_TaxID=698738 {ECO:0000313|EMBL:CCK74779.1, ECO:0000313|Proteomes:UP000032749};
RN [1] {ECO:0000313|EMBL:CCK74779.1, ECO:0000313|Proteomes:UP000032749}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX PubMed=23877221; DOI=10.1038/ncomms3156;
RA Kube M., Chernikova T.N., Al-Ramahi Y., Beloqui A., Lopez-Cortez N.,
RA Guazzaroni M.E., Heipieper H.J., Klages S., Kotsyurbenko O.R., Langer I.,
RA Nechitaylo T.Y., Lunsdorf H., Fernandez M., Juarez S., Ciordia S.,
RA Singer A., Kagan O., Egorova O., Petit P.A., Stogios P., Kim Y.,
RA Tchigvintsev A., Flick R., Denaro R., Genovese M., Albar J.P., Reva O.N.,
RA Martinez-Gomariz M., Tran H., Ferrer M., Savchenko A., Yakunin A.F.,
RA Yakimov M.M., Golyshina O.V., Reinhardt R., Golyshin P.N.;
RT "Genome sequence and functional genomic analysis of the oil-degrading
RT bacterium Oleispira antarctica.";
RL Nat. Commun. 4:2156-2156(2013).
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; FO203512; CCK74779.1; -; Genomic_DNA.
DR AlphaFoldDB; R4YRP3; -.
DR STRING; 698738.OLEAN_C06030; -.
DR KEGG; oai:OLEAN_C06030; -.
DR PATRIC; fig|698738.3.peg.621; -.
DR HOGENOM; CLU_055003_1_3_6; -.
DR OrthoDB; 9787365at2; -.
DR UniPathway; UPA00047; UER00055.
DR UniPathway; UPA00049; UER00059.
DR Proteomes; UP000032749; 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:UP000032749};
KW Transferase {ECO:0000256|RuleBase:RU368092, ECO:0000313|EMBL:CCK74779.1}.
FT DOMAIN 8..82
FT /note="ACT"
FT /evidence="ECO:0000259|PROSITE:PS51671"
SQ SEQUENCE 167 AA; 18213 MW; 05994A3529C5C1C6 CRC64;
MSLPQRHIIS ILLENEPGAL SRVVGLFAQR GYNIETLTVA PTEDETLSRL TMTTIGNDSK
VEQITKQLNR LIEVVKLVNL TEGPHIEREL MLIKVKAVGA QRAEIKRTAD VFRGQVVDIS
SSVYTVQLTG TTDKLAAFIE AIGPSCVLET VRTGVSGISR GEKVLSL
//
