IlvC

• Description: ketol-acid reductoisomerase (2,3-dihydroxy-3-methylbutanoate, 2-acetolactate)
  
  

Gene name	ilvC
Synonyms
Essential	no
Product	ketol-acid reductoisomerase (2,3-dihydroxy-3-methylbutanoate, 2-acetolactate)
Function	biosynthesis of branched-chain amino acids
Metabolic function and regulation of this protein in SubtiPathways: Ile, Leu, Val, Coenzyme A
MW, pI	37 kDa, 5.37
Gene length, protein length	1026 bp, 342 aa
Immediate neighbours	leuA, ilvH
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList

The gene

Basic information

• Locus tag: BSU28290

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: (R)-2,3-dihydroxy-3-methylbutanoate + NADP⁺ = (S)-2-hydroxy-2-methyl-3-oxobutanoate + NADPH (according to Swiss-Prot)

• Protein family: ketol-acid reductoisomerase 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: 1NP3 (from Escherichia coli, 53% identity, 71% similarity) PubMed

• UniProt: P37253

• KEGG entry: [3]

• E.C. number: 1.1.1.86

Expression and regulation

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

• Sigma factor: SigA PubMed

• Regulation:
  • 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, T-box) PubMed

• Regulatory mechanism:
  • CodY: transcription repression PubMed
  • CcpA: transcription activation PubMed
  • T-box: tRNA-controlled RNA switch that mediates termination/antitermination
  • TnrA: transcription repression PubMed

• Additional information:

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion: pGP521 (in pAC5), available in Stülke lab

• GFP fusion:

• two-hybrid system:

• Antibody: