IlvH

• Description: acetolactate synthase (small subunit)
  
  

Gene name	ilvH
Synonyms	ilvN
Essential	no
Product	acetolactate synthase (small subunit)
Function	biosynthesis of branched-chain amino acids
Gene expression levels in SubtiExpress: ilvH
Metabolic function and regulation of this protein in SubtiPathways: Ile, Leu, Val, Coenzyme A
MW, pI	19 kDa, 10.295
Gene length, protein length	522 bp, 174 aa
Immediate neighbours	ilvC, ilvB
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList
Expression at a glance   PubMed

Categories containing this gene/protein

biosynthesis/ acquisition of amino acids

This gene is a member of the following regulons

CcpA regulon, CodY regulon, T-box, TnrA regulon

The gene

Basic information

• Locus tag: BSU28300

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: 2 pyruvate = 2-acetolactate + CO₂ (according to Swiss-Prot)

• Protein family: acetolactate synthase small subunit family (according to Swiss-Prot)

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity:

• Interactions:

• Localization:

Database entries

• Structure: 2F1F (regulatory subunit from Escherichia coli, 37% identity, 62% similarity) PubMed

• UniProt: P37252

• KEGG entry: [3]

• E.C. number: 2.2.1.6

Expression and regulation

• Operon: ilvB-ilvH-ilvC-leuA-leuB-leuC-leuD PubMed

• Expression browser: ilvH PubMed

• Sigma factor: SigA PubMed

• Regulation: for a complete overview on the regulation of the ilv operon, see Brinsmade et al.
  • repressed by casamino acids PubMed
  • expression is stimulated in the presence of glucose PubMed
  • repressed in the absence of good nitrogen sources (glutamine or ammonium) (TnrA) PubMed
  • repressed during growth in the presence of branched chain amino acids (CodY) PubMed

• Regulatory mechanism:
  • glucose regulation: CcpA PubMed
  • repression by BCAA: tRNA-controlled RNA switch (T-box) that mediates termination/antitermination
  • TnrA: transcription repression PubMed
  • CodY: transcription repression PubMed

• Additional information:

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody: