2-oxo-3-sulfanylpropanoate + L-cysteinyl-[protein] <=> S-sulfanyl-L-cysteinyl-[protein] + pyruvate
2-oxo-3-sulfanylpropanoate + l-cysteinyl-[protein] <=> s-sulfanyl-l-cysteinyl-[protein] + pyruvate
2-oxo-3-sulfanylpropanoate + L-cysteinyl-[protein] <=> S-sulfanyl-L-cysteinyl-[protein] + pyruvate
2-oxo-3-sulfanylpropanoate + l-cysteinyl-[protein] <=> s-sulfanyl-l-cysteinyl-[protein] + pyruvate