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{{enzyme
| Name = cysteine lyase
| EC_number = 4.4.1.10
| CAS_number = 9079-86-1
| IUBMB_EC_number = 4/4/1/10
| GO_code = 0047803
| image = 
| width = 
| caption = 
}}
In [[enzymology]], a '''cysteine lyase''' ({{EC number|4.4.1.10}}) is an [[enzyme]] that [[catalysis|catalyzes]] the [[chemical reaction]]

:L-cysteine + sulfite <math>\rightleftharpoons</math> L-cysteate + hydrogen sulfide

Thus, the two [[substrate (biochemistry)|substrates]] of this enzyme are [[L-cysteine]] and [[sulfite]], whereas its two [[product (chemistry)|products]] are [[L-cysteate]] and [[hydrogen sulfide]].

This enzyme belongs to the family of [[lyase]]s, 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 (biochemistry)|cofactor]], [[pyridoxal phosphate]].  

==References==
{{reflist|1}}
* {{cite journal | author = Tolosa EA, Chepurnova NK, Khomutov RM, Severin ES | date = 1969 | title = Reactions catalysed by cysteine lyase from the yolk sac of chicken embryo | journal = Biochim. Biophys. Acta.  | volume = 171 | pages = 369&ndash;71  | pmid = 5813025 | issue = 2 }}

{{lyase-stub}}

[[Category:EC 4.4.1]]
[[Category:Pyridoxal phosphate enzymes]]
[[Category:Enzymes of unknown structure]]