Ficain

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Ficain
Identifiers
EC number 3.4.22.3
CAS number 9001-33-6
Databases
IntEnz IntEnz view
BRENDA BRENDA entry
ExPASy NiceZyme view
KEGG KEGG entry
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum

Ficain (EC 3.4.22.3, ficin, debricin, higueroxyl delabarre) is an enzyme that is derived from figs latex.[1][2] 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.

References[edit]

  1. ^ Liener, I.E. and Friedenson, B. (1970). "Ficin". Methods Enzymol. 19: 261–273. doi:10.1016/0076-6879(70)19020-3. 
  2. ^ Brocklehurst, K., Willenbrock, F. and Salih, E. (1987). "Cysteine proteinases". In Neuberger, A. and Brocklehurst, K. New Comprehensive Biochemistry: Hydrolytic Enzymes. Amsterdam: Elsevier. pp. 39–158. 

External links[edit]