Paper mulberry (Broussonetia papyrifera, syn. Morus papyrifera L.) is a Chinese traditional medicine and its low-molecular-weight extracts are reported to have antifungal activity. In this study, two proteins (PMAPI and PMAPII) with activity against Trichoderma viride were obtained from paper mulberry leaves with a fast protein liquid chromatography (FPLC) unit. The purification protocol employed (NH(4))(2)SO(4) precipitation, ion-exchange chromatography and hydrophobic-interaction chromatography on FPLC. Molecular masses were 18,798 Da for PMAPI, and 31,178 Da for PMAPII determined by Matrix-assisted laser desorption ionization time-of-flight mass spectrometry. Peptide mapping fingerprint analysis showed that PMAPI has no peptides similar to PMAPII. N-terminal amino acid sequencing revealed that PMAPI is a hevein-like protein, and PMAPII is a class I chitinase. They both had a half-maximal inhibitory concentration (IC50) of 0.1 µg/µL against T. viride. This is the first report of high-molecular-weight extracts with antifungal activity from paper mulberry.
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