EC number 3.4.22.3 IntEnz IntEnz view ExPASy NiceZyme view | CAS number 9001-33-6 BRENDA BRENDA entry KEGG KEGG entry | |
Ficain (EC 3.4.22.3, ficin, debricin, higueroxyl delabarre) is an enzyme that is derived from figs latex. It is of a family of proteases known as the cysteine endopeptidases, a group that also includes papain derived from papaya latex, bromelase (bromelain) extracted from pineapple stem, calpain, caspases, cathepsin B, and chymopapain. It is one of the most commonly used for differentiating many blood group antigens: For example, it destroys M, N, S, Duffy a, and Duffy b, and enhances some other antigens including antigens from the Rh, Kidd, Lewis, I, and P1 systems.
It is a common occurrence when eating the skins or the white pulp directly inside the skin of a fig to get a burning or itching sensation. This is due to the ficin in the latex (sap) of the fruit, particularly if it is unripened.