Purification and Characterization of O-Acetylserine Sulfhydrylase of Corynebacterium glutamicum

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We highly purified O-acetylserine sulfhydrylase from the glutamate-producing bacterium Corynebacterium glutamicum. The molecular mass of the purified enzyme was 34,500 as determined by SDS-polyacrylamide gel electrophoresis, and 70,800 as determined by gel filtration chromatography. It had an apparent K_m of 7.0 mM for O-acetylserine and a V_max of 435 μmol min⁻¹ (mg·protein)⁻¹. This is the first report of the cysteine biosynthetic enzyme of C. glutamicum in purified form.