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The PatB protein of Bacillus subtilis had both cystathionine β-lyase and cysteine desulfhydrase activities in vitro. The apparent K m value of the PatB protein for cystathionine was threefold higher than that of the MetC protein, the previously characterized cystathionine β-lyase of B. subtilis. In the presence of cystathionine as sole sulfur source, the patB gene present on a multicopy plasmid...