Purification, Characterization and N-terminal Sequences Alignment of a Mannose Specific Protein Purified from Potca Fish, Tetraodon patoca |
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Authors: | Nurul Absar Sohel Hasan F Arisaka |
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Institution: | (1) Department of Biochemistry and Molecular Biology, University of Rajshahi, Rajshahi, 6205, Bangladesh;(2) Department of Biomolecular Engineering, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology (TIT), Yokohama 226-8501, Japan |
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Abstract: | A protein was isolated and purified from the ventral portion of the Potca fish, Tetraodon patoca. The method was accomplished by gel filtration of crude protein extract on Sephadex G-50 followed by Ion exchange chromatography
on DEAE-cellulose and finally by affinity chromatography on ConA-Sepharose matrix. The molecular weight of the protein, determined
by the gel filtration and SDS-PAGE was about 82,000 and 80,000 respectively, but 42,000 and 38,000 were indicated by SDS-PAGE
in the presence of 2-mercaptoethanol. The protein agglutinated rat red blood cells and in a haptein-inhibition test, the protein
was inhibited specifically by the d-mannose and mannose containing saccharides. The protein is glycoprotein with neutral sugar content of about 0.35%. The purified
protein also showed strong cytotoxic effects, which was performed by brine shrimp lethality bioassay and histopathological
examinations. The N-terminal amino acid sequences of both the subunits of the protein were also identified and used a blast
search on N-terminal amino acid sequences of the subunits revealed that the protein showed significant homology with the homologous
proteins in database. |
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Keywords: | PFP Histopathology SDS-PAGE Sequence homology |
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