Studies on the Synthesis of γ-L-Glutamyl-S-Methyl-L-Cysteine

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The presence of γ-L-glutamyl-S-methyl-L-cysteine in kidney beans (Phaseolus vulgaris L.) and lima beans (Phaseolus limensis Macted.) has been reported by several investigators. Thompson et al. have prepared this peptide from S-methylglutathione by the carboxy peptidase method. In this report a new and different method of synthesis of γ-L-glutamyl-S-methyl-L-cysteine is described. The peptide was confirmed by elemental analysis, melting point, and paper chromatography. The infrared spectrum of this compound was identical with those of the authentic samples from Phaseolus vulgaris and S-methyl glutathione.