From Wikipedia:

In enzymology, a cysteine desulfurase (EC2.8.1.7) is an enzyme thatcatalyzesthe chemical reaction

Thus, the two substrates of this enzyme are L-cysteine and [[[enzyme]-cysteine]], whereas its two products are L-alanine and [[[enzyme]-S-sulfanylcysteine]].

This enzyme belongs to the family of transferases, specifically the sulfurtransferases, which transfer sulfur-containing groups. The systematic name of this enzyme class is L-cysteine:[enzyme cysteine] sulfurtransferase. Other names in common use include IscS, NIFS, NifS,SufS, and cysteine desulfurylase. This enzyme participates in thiamine metabolism.