This family consists of several fungal chitosanase proteins. Chitin, xylan, 6-O-sulphated chitosan and O-carboxymethyl chitin are indigestible by chitosanase [1].
Zhang XY, Dai AL, Kuroiwa K, Kodaira R, Nogawa M, Shimosaka M, Okazaki M.
Cloning and characterization of a chitosanase gene from the koji mold Aspergillus oryzae strain IAM 2660.
Biosci. Biotechnol. Biochem. 65 2001 977-81
[PubMed: 11388486] http://dx.doi.org/10.1271/bbb.65.977