ID B9NQ11_9RHOB Unreviewed; 186 AA.
AC B9NQ11;
DT 24-MAR-2009, integrated into UniProtKB/TrEMBL.
DT 24-MAR-2009, sequence version 1.
DT 27-MAR-2024, entry version 49.
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=ilvN {ECO:0000313|EMBL:EEE38843.1};
GN ORFNames=RKLH11_2688 {ECO:0000313|EMBL:EEE38843.1};
OS Rhodobacteraceae bacterium KLH11.
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Rhodobacterales;
OC Paracoccaceae.
OX NCBI_TaxID=467661 {ECO:0000313|EMBL:EEE38843.1, ECO:0000313|Proteomes:UP000005135};
RN [1] {ECO:0000313|Proteomes:UP000005135}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=KLH11 {ECO:0000313|Proteomes:UP000005135};
RX PubMed=21742885; DOI=10.1128/jb.05556-11;
RA Zan J., Fricke W.F., Fuqua C., Ravel J., Hill R.T.;
RT "Genome Sequence of Ruegeria sp. Strain KLH11, an N-Acylhomoserine Lactone-
RT Producing Bacterium Isolated from the Marine Sponge Mycale laxissima.";
RL J. Bacteriol. 193:5011-5012(2011).
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; DS999531; EEE38843.1; -; Genomic_DNA.
DR AlphaFoldDB; B9NQ11; -.
DR STRING; 467661.RKLH11_2688; -.
DR eggNOG; COG0440; Bacteria.
DR HOGENOM; CLU_055003_1_2_5; -.
DR OrthoDB; 9787365at2; -.
DR UniPathway; UPA00047; UER00055.
DR UniPathway; UPA00049; UER00059.
DR Proteomes; UP000005135; Unassembled WGS sequence.
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:UP000005135};
KW Transferase {ECO:0000256|RuleBase:RU368092, ECO:0000313|EMBL:EEE38843.1}.
FT DOMAIN 30..105
FT /note="ACT"
FT /evidence="ECO:0000259|PROSITE:PS51671"
SQ SEQUENCE 186 AA; 20219 MW; 69EB2460C2F47202 CRC64;
MSALHIKKGS TRHSAYNLRP TFSDVQERHT IAVLVENEPG VLARVIGLFS GRGYNIESLT
VAEVDHTGHL SRITIVTTGT PQVIEQIKAQ LGRIVSVRDV HDLTVEGSSV ERELAIIKVV
GEGDKRVEAL RLADIFRANV VDSTLNSFIF EITGAPDKID AFADLMRPLG LVEIARTGVA
ALLRGD
//
