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What (who) is cysteine proteinase - definition
![Cysteine synthesis: [[Cystathionine beta synthase]] catalyzes the upper reaction and [[cystathionine gamma-lyase]] catalyzes the lower reaction.](https://commons.wikimedia.org/wiki/Special:FilePath/Cysteine biosynthesis.svg?width=200 "Cysteine synthesis: [[Cystathionine beta synthase]] catalyzes the upper reaction and [[cystathionine gamma-lyase]] catalyzes the lower reaction.")
Wikipedia
Cysteine proteases, also known as thiol proteases, are hydrolase enzymes that degrade proteins. These proteases share a common catalytic mechanism that involves a nucleophilic cysteine thiol in a catalytic triad or dyad.
Discovered by Gopal Chunder Roy in 1873, the first cysteine protease to be isolated and characterized was papain, obtained from Carica papaya. Cysteine proteases are commonly encountered in fruits including the papaya, pineapple, fig and kiwifruit. The proportion of protease tends to be higher when the fruit is unripe. In fact, the latex of dozens of different plant families are known to contain cysteine proteases. Cysteine proteases are used as an ingredient in meat tenderizers.
