Food Science and Biotechnology

Korean Society of Food Science and Technology (한국식품과학회)
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Isolation and Characterization of a Trypsin Inhibitor and a Lectin from Glycine max cv. Large Black Soybean

  • Ye, Xiu Juan (School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong) ;
  • Ng, Tzi Bun (School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong)
  • Published : 2009.10.31
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Abstract

Trypsin inhibitors and lectins are defense proteins produced by many organisms. From Chinese 'Large Black Soybeans', a 60 kDa lectin and a 20 Da trypsin inhibitor (TI) were isolated using chromatography on Q-Sepharose, Mono Q, and Superdex 75. The TI inhibited trypsin and chymotrypsin with an $IC_{50}$ of 5.7 and $5{\mu}M$, respectively. Trypsin inhibitory activity of the TI was stable from pH 3 to 13 and from 0 to $65^{\circ}C$. Hemagglutinating activity of the lectin was stable from pH 2 to 13 and from 0 to $65^{\circ}C$. The TI was inhibited by dithiothreitol, signifying the importance of disulfide bond. The TI and the lectin inhibited HIV-1 reverse transcriptase ($IC_{50}$=44 and $26{\mu}M$), and proliferation of breast cancer cells ($IC_{50}$=42 and $13.5{\mu}M$) and hepatoma cells ($IC_{50}$=96 and $175{\mu}M$). The hemagglutinating activity of the lectin was inhibited most potently by L-arabinose. Neither the lectin nor the TI displayed antifungal activity.

Keywords

References

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