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Chitinase-like proteins with antifungal activity from emperor banana fruits
1Department of Biochemistry, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
Abstract:
Two 30-kDa proteins with N-terminal sequence homology to chitinases have been isolated from fruits of the emperor banana by using a protocol that involved (NH(4))(2)SO(4) precipitation, affinity chromatography on Affi-gel blue gel, ion exchange chromatography by fast protein liquid chromatography (FPLC) on Mono S and gel filtration by FPLC on Superdex 75. The proteins were adsorbed on Affi-gel blue gel and Mono S. They both inhibited mycelial growth in Fusarium oxysporum but not in Mycosphaerella arachidicola. The chitinase-like protein more strongly bound on Mono S was obtained with a slightly lower yield and exhibited a higher antifungal potency toward F. oxysporum when compared with the less strongly bound chitinase-like protein.
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