This enzyme belongs to the family of lyases, specifically the class of carbon-sulfur lyases. The systematic name of this enzyme class is L-cysteine hydrogen-sulfide-lyase (adding sulfite L-cysteate-forming). Other names in common use include cysteine (sulfite) lyase, and L-cysteine hydrogen-sulfide-lyase (adding sulfite). This enzyme participates in cysteine metabolism and taurine and hypotaurine metabolism. It employs one cofactor, pyridoxal phosphate.
Tolosa EA, Chepurnova NK, Khomutov RM, Severin ES (1969). "Reactions catalysed by cysteine lyase from the yolk sac of chicken embryo". Biochim. Biophys. Acta.171 (2): 369–71. doi:10.1016/0005-2744(69)90174-0. PMID5813025.