Main Reaction: L-cysteine >> L-lanthionine + sulfur dioxide

Reference: PubMed ID: 20413556
Authors: Yoshida Y, Ito S, Kamo M, Kezuka Y, Tamura H, Kunimatsu K, Kato H
Title: Production of hydrogen sulfide by two enzymes associated with biosynthesis of homocysteine and lanthionine in Fusobacterium nucleatum subsp. nucleatum ATCC 25586.
Published: 2010 Jul

L-cysteine --> L-lanthionine + sulfur dioxide