S-ribosylhomocysteine lyase

In enzymology, a S-ribosylhomocysteine lyase (EC4.4.1.21) is an enzyme that catalyzes the chemical reaction

Hence, this enzyme has one substrate, S-(5-deoxy-D-ribos-5-yl)-L-homocysteine, and two products, L-homocysteine and (4S)-4,5-dihydroxypentan-2,3-dione.