The Enzymatic Synthesis of L-Cysteine in Higher Plant Tissues

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Abstract
Two enzymes that are together involved in the biosynthesis of cysteine in higher plants, O-acetyl-L-serine sulfhydrylase and L-serine acetyltransferase, have been isolated from the germinating seeds of different species of rape (Brassica spp.), and some of their properties studied.It is shown that some of the properties of the acetyltransferase enzyme differ markedly from those reported for the enzyme isolated from kidney bean seedlings. No correlation could be found between the levels of O-acetyl-L-serine sulfhydrylase and thioglucoside levels in the seeds of the various species of rape studied. The occurrence of this enzyme in a number of other species of flowering plants is also shown.

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