Reversible conjugation of isothiocyanates with glutathione catalyzed by human glutathione transferases

Yue Sheng Zhang, Rüdiger H. Kolm, Bengt Mannervik, Paul Talalay

Research output: Contribution to journalArticlepeer-review

Abstract

Rates were determined for the nonenzymatic (second order rate constants) and enzyme-catalyzed conjugations with glutathione of four isothiocyanates that are present in edible plants (allyl-, benzyl-, phenethyl-isothiocyanates, and sulforaphane). of four cloned human glutathione transferases studied, GSTP1-1 and GSTM1-1 were the most efficient catalysts. GSTA1-1 was less efficient, and GSTM2-2 was the least efficient. Conjugation of benzyl-NCS is the most rapid and that of sulforaphane [CH3S(O)(CH2)4-NCS] is the slowest. The large enzymatic rate enhancements and the abundance of the enzymes suggest that the glutathione transferases play important roles in the metabolic disposition of isothiocyanates in humans. Enzymatic cleavage of the GSH conjugates of isothiocyanates (dithiocarbamates) is catalyzed by glutathione transferases. The importance of these reverse reactions is probably limited because they are slow and inhibited by high intracellular concentrations of glutathione.

Original languageEnglish (US)
Pages (from-to)748-755
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume206
Issue number2
DOIs
StatePublished - Jan 17 1995

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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