Enzyme/Protein | Function | Reference compound | Hosts | Ref. |
Chitinase B | To hydrolyze the polymeric chitin of N-acetylglucosamine framework. Together with the β-1,3-glucanases plays an indirect defensive role: the oligosaccharides of 1,3-β-/1,6-glucan are destroyed in pathogens cell walls. Inhibition of the fungi growth is produced, and a wide range of defense responses are induced in plants. | Chitin (S) F0O (I) | Alternaria brassicicola Sclerotinia sclerotiorum Rhizoctonia solani | [19] [20] [21] |
1,3-β- Glucanase | To perform their protective function by a hydrolysis of the 1,3-β-/1,6-glucan bond present in the pathogens cell walls. | 1,3-β-/1,6- glucane (S) Apegin (I) | Fusarium moniliforme F. verticillioides Aspergillus Flavus Alternaria solani Colletotrichum fragariae C. acutatum | [22] [23] [24] [25] |
ECP6 | Recognition of specific sequences. It encodes three domains of lysine that disrupt chitin-triggered immunity. | Chitin (L) | Cladosporium. fulvum | [18] |
AVR4 | A chitin-binding lectin that protects fungal cell walls from plant chitinases, providing a defensive role during infection. It inhibits the Cys-protease Rcr3 secreted by tomato plants and binds chitinases at the fungus cell wall. | Chitin (L) | Cladosporium. fulvum | [26] |