Purification and characterization of a novel haemagglutinin from Chlorella pyrenoidosa
Tóm tắt
We previously identified a strong haemagglutination activity in the freshwater unicellular green alga, Chlorella pyrenoidosa. Here, we sought to purify and characterize the haemagglutinin associated with this activity. Ammonium sulfate precipitation, gel filtration on sephacryl S-200 and DEAE-Sepharose ion-exchange chromatography were used to purify the haemagglutinin, which was designated CPH (Chlorella pyrenoidosa haemagglutinin). The molecular weight of CPH was estimated as 58 kDa by SDS-PAGE and 60 kDa by gel filtration of the native protein, indicating that this haemagglutinin exists as a monomer. The haemagglutinin activity of CPH was inhibited by glycoproteins, especially yeast mannan, but not by monosaccharides or disaccharides, indicating that CPH is carbohydrate-specific. In addition to the composition of CPH shown to be rich in glycine and acidic amino acids, heamagglutinating activity of CPH was insensitive to variations in pH or the presence of divalent cations, and atomic force microscopy revealed that the protein is rod-shaped. These results indicate that the characteristics of CPH are consistent with its identification as a haemagglutinin, and suggest that CPH may be a viable candidate for applications in a variety of biomedical fields.
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