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The enzyme is deacylated by a water molecule and releases the carboxy terminal portion of the peptide. In immunology, papain is known to cleave the Fc (crystallisable) portion of immunoglobulins (antibodies) from the Fab (antigen-binding) portion. Papain is a relatively heat-resistant enzyme, with an optimal temperature range of 60 to 70 °C. [9]
Chymopapain (EC 3.4.22.6, chymopapain A, chymopapain B, chymopapain S, brand name Chymodiactin) is a proteolytic enzyme isolated from the latex of papaya (Carica papaya).It is a cysteine protease which belongs to the papain-like protease (PLCP) group. [1]
Actinidain (EC 3.4.22.14, actinidin, Actinidia anionic protease, proteinase A2 of Actinidia chinensis) is a type of cysteine protease enzyme found in fruits including kiwifruit (genus Actinidia), pineapple, mango, banana, figs, and papaya. This enzyme is part of the peptidase C1 family of papain-like proteases. [1] [2] [3] [4]
This may be partly due to variation in the oxidization state of the active-site sulfur, as is the case with homologous enzymes from pineapple stem, although genetic polymorphism may also contribute. The crystal structure of caricain has been solved to a resolution of 1.8 A ̊, and demonstrates main-chain conformation very similar to that of papain.
In the MEROPS protease enzyme classification system, papain-like proteases form Clan CA. [2] Papain-like proteases share a common catalytic dyad active site featuring a cysteine amino acid residue that acts as a nucleophile. [1] The human genome encodes eleven cysteine cathepsins which have a broad range of physiological functions. [3]
The papain enzyme present in the milky latex of immature fruits and leaves is often used in the culinary industry as a meat tenderizer since it is a digestive enzyme. [7] Traditionally, the mountain papaya fruit is also prepared as an infused drink including passion fruit, apple, and other fruits and is often sold by street vendors. [citation ...
The genus was formerly treated as including about 20-25 species of short-lived evergreen pachycaul shrubs or small trees growing to 5–10 m tall, native to tropical Central and South America, but recent genetic evidence has resulted in all of these species other than C. papaya being reclassified into three other genera.
Papain is a protease obtained from the latex of the fruit of the papaya tree. It has been used (without regulation) for wound debridement for many years, but in the US in 2008 it was brought under regulation by the U.S. Food and Drug Administration and removed from sale for this purpose, following reports of adverse effects. On the other hand ...
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