. "Catalysis of the reaction: L-cysteine + [enzyme]-cysteine = L-alanine + [enzyme]-S-sulfanylcysteine." . . "cysteine desulfurase activity" . "IscS" . "NIFS" . "SufS" . "cysteine desulfurylase activity" . "L-cysteine:enzyme cysteine sulfurtransferase activity" . . .