LeuD

• Description: 3-isopropylmalate dehydratase (small subunit)
  
  

Gene name	leuD
Synonyms
Essential	no
Product	3-isopropylmalate dehydratase (small subunit)
Function	biosynthesis of leucine
Metabolic function and regulation of this protein in SubtiPathways: Ile, Leu, Val
MW, pI	22 kDa, 4.582
Gene length, protein length	597 bp, 199 aa
Immediate neighbours	ysoA, leuC
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList

Categories containing this gene/protein

biosynthesis/ acquisition of amino acids

This gene is a member of the following regulons

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

The gene

Basic information

• Locus tag: BSU28250

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: (2R,3S)-3-isopropylmalate = (2S)-2-isopropylmaleate + H₂O (according to Swiss-Prot)

• Protein family: LeuD type 1 subfamily (according to Swiss-Prot)

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s): contains an iron-sulfur cluster

• Effectors of protein activity:

• Interactions:

• Localization:

Database entries

• Structure: 2PKP (from Methanocaldococcus jannaschii dsm 2661, 38% identity, 53% similarity)

• UniProt: P94568

• KEGG entry: [3]

• E.C. number: 4.2.1.33

Additional information

• subject to Clp-dependent proteolysis upon glucose starvation PubMed

Expression and regulation

• Operon: ilvB-ilvH-ilvC-leuA-leuB-leuC-leuD 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
  • less expressed under conditions of extreme iron limitation (FsrA) PubMed

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

• Additional information: subject to Clp-dependent proteolysis upon glucose starvation PubMed

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody: