Enzyme

4.2.1.33 - 3-isopropylmalate dehydratase

Alternative Name(s)
  • (2R,3S)-3-isopropylmalate hydro-lyase.
  • Isopropylmalate isomerase.
  • Alpha-IPM isomerase.
  • 3-isopropylmalate hydro-lyase.

Catalytic Activity

(2R,3S)-3-isopropylmalate = (2S)-2-isopropylmalate

Cofactors

Iron-sulfur.

Reaction Mechanism

There are no Reaction Mechanism for this Enzyme

Reaction Parameters

  • Kinetic Parameters
    Organism KM Value [mM] Substrate Comment
    Saccharomyces cerevisiae 0.0216 dimethylcitraconate
    Neurospora crassa 0.078 alpha-hydroxy-beta-carboxyisocaproate
    Candida maltosa 0.75 beta-carboxy-beta-hydroxyisocaproate
  • Temperature
    Organism Temperature Range Comment
    Mycobacterium tuberculosis 15 - 95
  • pH
    Organism pH Range Comment
    Mycobacterium tuberculosis 4 - 9.5
    Salmonella enterica subsp. enterica serovar Typhimurium 6 - 8 at pH 6.0, 20% of optimum activity, activity varies only about 20% between pH 7.0 and 8.0
    Neurospora crassa 6 - 8 at pH 6.0, 20% of optimum activity, activity varies only about 20% between pH 7.0 and 8.0
    Neurospora sp. 6 - 8 at pH 6.0, 20% of optimum activity, activity varies only about 20% between pH 7.0 and 8.0
    Salmonella sp. 6 - 8 at pH 6.0, 20% of optimum activity, activity varies only about 20% between pH 7.0 and 8.0

Associated Proteins

Protein name Organism
3-isopropylmalate dehydratase small subunit Escherichia coli (strain K12)
3-isopropylmalate dehydratase large subunit Escherichia coli (strain K12)
3-isopropylmalate dehydratase small subunit 1 Mouse-ear cress
3-isopropylmalate dehydratase Fission yeast
3-isopropylmalate dehydratase large subunit 2 Archaeoglobus fulgidus (strain ATCC 49558 / VC-16 / DSM 4304 / JCM 9628 / NBRC 100126)

Citations