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After heterologous expression in Escherichia coli, the Azotobacter vinelandii rhodanese RhdA is purified in a persulfurated form (RhdA-SSH). We identified l-cysteine as the most effective sulfur source in producing RhdA-SSH. An E. coli soluble extract was required for in vitro persulfuration of RhdA, and the addition of pyridoxal-5′-phosphate increased RhdA-SSH production, indicating a likely involvement...