This family consists of several fungal chitosanase proteins. Chitin, xylan, 6-O-sulphated chitosan and O-carboxymethyl chitin are indigestible by chitosanase [1]. EC:3.2.1.132. The mechanism is likely to be inverting, and the probable catalytic neutrophile base is Asp, with the probable catalytic proton donor being Glu. (see the Chitosanase web-page from CAZY).

1: An Aspergillus chitosanase with potential for large-scale preparation of chitosan oligosaccharides. Cheng CY, Li YK; Biotechnol Appl Biochem 2000;32:197-203. PMID:11115392

2: Cloning and characterization of a chitosanase gene from the koji mold Aspergillus oryzae strain IAM 2660. Zhang XY, Dai AL, Kuroiwa K, Kodaira R, Nogawa M, Shimosaka M, Okazaki M; Biosci Biotechnol Biochem 2001;65:977-981. PMID:11388486