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A protein has been isolated from spinach leaves which catalyzes the following isotopic exchange reaction: Cys-SH+H 2  35 S ↔ Cys- 35 SH + H 2 S . This enzyme has an pH-optimum above 9.0; its molecular weight has been estimated on a Sephadex-G-100 column to be around 64 000 daltons. During purification this exchange reaction activity follows cysteine synthase activity on DEAE-cellulose and Sephadex-G-100 column chromato­ graphy; however this enzyme fraction has not been purified to homogeneity to prove that both activities are catalyzed by the same protein.

Protein-Catalyzed Isotopic Exchange Reaction between Cysteine and Sulfide in Spinach Leaves