ID   ILVH_MYCS2              Reviewed;         170 AA.
AC   A0QUX7; I7FJ23;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   09-JAN-2007, sequence version 1.
DT   27-MAR-2024, entry version 99.
DE   RecName: Full=Acetolactate synthase small subunit;
DE            EC=2.2.1.6;
DE   AltName: Full=Acetohydroxy-acid synthase small subunit;
DE            Short=AHAS;
DE            Short=ALS;
GN   Name=ilvH; Synonyms=ilvN; OrderedLocusNames=MSMEG_2373, MSMEI_2313;
OS   Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155) (Mycobacterium
OS   smegmatis).
OC   Bacteria; Actinomycetota; Actinomycetes; Mycobacteriales; Mycobacteriaceae;
OC   Mycolicibacterium.
OX   NCBI_TaxID=246196;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700084 / mc(2)155;
RA   Fleischmann R.D., Dodson R.J., Haft D.H., Merkel J.S., Nelson W.C.,
RA   Fraser C.M.;
RL   Submitted (OCT-2006) to the EMBL/GenBank/DDBJ databases.
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700084 / mc(2)155;
RX   PubMed=17295914; DOI=10.1186/gb-2007-8-2-r20;
RA   Deshayes C., Perrodou E., Gallien S., Euphrasie D., Schaeffer C.,
RA   Van-Dorsselaer A., Poch O., Lecompte O., Reyrat J.-M.;
RT   "Interrupted coding sequences in Mycobacterium smegmatis: authentic
RT   mutations or sequencing errors?";
RL   Genome Biol. 8:R20.1-R20.9(2007).
RN   [3]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700084 / mc(2)155;
RX   PubMed=18955433; DOI=10.1101/gr.081901.108;
RA   Gallien S., Perrodou E., Carapito C., Deshayes C., Reyrat J.-M.,
RA   Van Dorsselaer A., Poch O., Schaeffer C., Lecompte O.;
RT   "Ortho-proteogenomics: multiple proteomes investigation through orthology
RT   and a new MS-based protocol.";
RL   Genome Res. 19:128-135(2009).
RN   [4]
RP   PUPYLATION AT LYS-46, AND IDENTIFICATION BY MASS SPECTROMETRY.
RX   PubMed=20094657; DOI=10.1039/b916104j;
RA   Watrous J., Burns K., Liu W.T., Patel A., Hook V., Bafna V.,
RA   Barry C.E. III, Bark S., Dorrestein P.C.;
RT   "Expansion of the mycobacterial 'PUPylome'.";
RL   Mol. Biosyst. 6:376-385(2010).
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   -!- PATHWAY: Amino-acid biosynthesis; L-isoleucine biosynthesis; L-
CC       isoleucine from 2-oxobutanoate: step 1/4.
CC   -!- PATHWAY: Amino-acid biosynthesis; L-valine biosynthesis; L-valine from
CC       pyruvate: step 1/4.
CC   -!- SUBUNIT: Dimer of large and small chains. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the acetolactate synthase small subunit family.
CC       {ECO:0000305}.
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DR   EMBL; CP000480; ABK72789.1; -; Genomic_DNA.
DR   EMBL; CP001663; AFP38783.1; -; Genomic_DNA.
DR   RefSeq; WP_003893741.1; NZ_SIJM01000012.1.
DR   RefSeq; YP_886715.1; NC_008596.1.
DR   AlphaFoldDB; A0QUX7; -.
DR   SMR; A0QUX7; -.
DR   STRING; 246196.MSMEG_2373; -.
DR   PaxDb; 246196-MSMEI_2313; -.
DR   GeneID; 66733787; -.
DR   KEGG; msg:MSMEI_2313; -.
DR   KEGG; msm:MSMEG_2373; -.
DR   PATRIC; fig|246196.19.peg.2339; -.
DR   eggNOG; COG0440; Bacteria.
DR   OrthoDB; 9787365at2; -.
DR   UniPathway; UPA00047; UER00055.
DR   UniPathway; UPA00049; UER00059.
DR   Proteomes; UP000000757; Chromosome.
DR   Proteomes; UP000006158; Chromosome.
DR   GO; GO:0003984; F:acetolactate synthase activity; IEA:UniProtKB-EC.
DR   GO; GO:1990610; F:acetolactate synthase regulator activity; IEA:InterPro.
DR   GO; GO:0009097; P:isoleucine biosynthetic process; IEA:UniProtKB-UniPathway.
DR   GO; GO:0009099; P:valine biosynthetic process; IEA:UniProtKB-UniPathway.
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   1: Evidence at protein level;
KW   Amino-acid biosynthesis; Branched-chain amino acid biosynthesis;
KW   Isopeptide bond; Reference proteome; Transferase; Ubl conjugation.
FT   CHAIN           1..170
FT                   /note="Acetolactate synthase small subunit"
FT                   /id="PRO_0000396815"
FT   DOMAIN          9..83
FT                   /note="ACT"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01007"
FT   CROSSLNK        46
FT                   /note="Isoglutamyl lysine isopeptide (Lys-Gln) (interchain
FT                   with Q-Cter in protein Pup)"
FT                   /evidence="ECO:0000269|PubMed:20094657"
SQ   SEQUENCE   170 AA;  18395 MW;  DDA5829FE67BC49D CRC64;
     MSNGTPTHTL SVLVEDKPGV LARVSSLFSR RGFNIQSLAV GATEQKDMSR MTIVVSVEDS
     PLEQITKQLN KLINVIKIVE QEEDNSVSRE LALIKVRADA TTRGQIIEAV NLFRAKVVDV
     STESLTIEAT GTPEKLEALL RVLEPYGIRE IAQSGVVSVS RGPRGIGAAK
//