Oligomerization Process of the Hemolytic Lectin CEL-III Purified From a Sea Cucumber, Cucumaria echinata.
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概要
- 論文の詳細を見る
CEL-III is a Ca2+-dependent lectin purified from a sea cucumber, Cucumaria echinata. This protein exhibits strong hemolytic activity as well as cytotoxicity toward some cul-tured cell lines. Hemolysis is caused by CEL-III oligomers formed in the cell membrane after binding to specific carbohydrate chains on the cell surface. We have found that the oligomerization of CEL-III is also induced by the binding of simple carbohydrates, such as lactose, in aqueous solution under high pH and high ionic strength conditions. From gel filtration analysis of the oligomerization of CEL-III, it was found that the formation of the CEL-III oligomer is effectively induced by the binding of lactose and lactulose, disaccharides containing a β-galactoside structure. Electron micrographs of the resulting oligomers revealed them to exist as particles with a size of approximately 20-30 nm. The oligomerization process required more than 1 h, which is consistent with the in-crease in surface hydrophobicity as measured using a fluorescent probe, 8-anilinonaph-thalene-1-sulfonate. However, a change in the far-UV CD spectra as well as small-angle X-ray scattering occurred within a few minutes, suggesting that a structural change in the protein takes place rapidly, but the following growth of the oligomer is a much slower process.
- 社団法人 日本生化学会の論文
著者
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KUWAHARA Hiromiki
Department of Applied Chemistry, Faculty of Engineering, Nagasaki University
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Hatakeyama Tomomitsu
Department Of Agricultural Chemistry Faculty Of Agriculture Kyushu University
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Aoyagi Haruhiko
Department Of Applied Chemistry Faculty Of Engineering Nagasaki University
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Yamasaki Takayuki
Department Of Applied Chemistry Faculty Of Engineering Nagasaki University
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Fujisawa Tetsuro
Struct. Biol. Lab. Harima Inst Instit. Phys. & Chem. Res.
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