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Database: UniProt
Entry: L8M7X8_9CYAN
LinkDB: L8M7X8_9CYAN
Original site: L8M7X8_9CYAN 
ID   L8M7X8_9CYAN            Unreviewed;       174 AA.
AC   L8M7X8;
DT   03-APR-2013, integrated into UniProtKB/TrEMBL.
DT   03-APR-2013, sequence version 1.
DT   24-JAN-2024, entry version 35.
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   ORFNames=Xen7305DRAFT_00041590 {ECO:0000313|EMBL:ELS04426.1};
OS   Xenococcus sp. PCC 7305.
OC   Bacteria; Cyanobacteriota; Cyanophyceae; Pleurocapsales; Xenococcaceae;
OC   Xenococcus.
OX   NCBI_TaxID=102125 {ECO:0000313|EMBL:ELS04426.1, ECO:0000313|Proteomes:UP000011203};
RN   [1] {ECO:0000313|EMBL:ELS04426.1, ECO:0000313|Proteomes:UP000011203}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7305 {ECO:0000313|EMBL:ELS04426.1,
RC   ECO:0000313|Proteomes:UP000011203};
RX   PubMed=23277585; DOI=10.1073/pnas.1217107110;
RA   Shih P.M., Wu D., Latifi A., Axen S.D., Fewer D.P., Talla E., Calteau A.,
RA   Cai F., Tandeau de Marsac N., Rippka R., Herdman M., Sivonen K.,
RA   Coursin T., Laurent T., Goodwin L., Nolan M., Davenport K.W., Han C.S.,
RA   Rubin E.M., Eisen J.A., Woyke T., Gugger M., Kerfeld C.A.;
RT   "Improving the coverage of the cyanobacterial phylum using diversity-driven
RT   genome sequencing.";
RL   Proc. Natl. Acad. Sci. U.S.A. 110:1053-1058(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}.
CC   -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC       whole genome shotgun (WGS) entry which is preliminary data.
CC       {ECO:0000313|EMBL:ELS04426.1}.
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DR   EMBL; ALVZ01000120; ELS04426.1; -; Genomic_DNA.
DR   RefSeq; WP_006508477.1; NZ_ALVZ01000120.1.
DR   AlphaFoldDB; L8M7X8; -.
DR   STRING; 102125.Xen7305DRAFT_00041590; -.
DR   PATRIC; fig|102125.3.peg.1253; -.
DR   eggNOG; COG0440; Bacteria.
DR   OrthoDB; 9787365at2; -.
DR   UniPathway; UPA00047; UER00055.
DR   UniPathway; UPA00049; UER00059.
DR   Proteomes; UP000011203; Unassembled WGS sequence.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProt.
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 2, 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:UP000011203};
KW   Transferase {ECO:0000256|RuleBase:RU368092, ECO:0000313|EMBL:ELS04426.1}.
FT   DOMAIN          4..78
FT                   /note="ACT"
FT                   /evidence="ECO:0000259|PROSITE:PS51671"
SQ   SEQUENCE   174 AA;  19097 MW;  E9A5EAECE62F4A30 CRC64;
     MKHTISVLVE DEAGVLTRIA GLFARRGFNI ESLAVGPAEK VGVSRITMVV PGDDTIIEQL
     IKQLYKLISV LKVQDITQTP SVERELMLVK VNATAANRAE VIQLVQIFRA RIVDIADEAV
     TLEVVGDPGK LVAIIQMLNK FGIKEISRTG KIALVRESGV NTEYLKSLEA KVYQ
//
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