Abstract
A novel lectin has been identified in rainbow trout serum and plasma. The lectin binds to Sepharose (an agarose polymer) in a calcium-dependent manner. Glucose, N-acetyl-glucosamine, mannose, N-acetylmannosamine, L-fucose, maltose and α-methyl-mannoside are good inhibitors of this binding, whereas glucosamine and D-fucose inhibits to a lesser degree and mannosamine and galactose do not inhibit the binding to Sepharose. When analysed by SDS-PAGE under non-reducing conditions, the lectin appears as a characteristic ladder of bands with approximately 16 kDa between consecutive bands. Upon reduction, the lectin appears as a 16-kDa band. On size-exclusion chromatography of trout serum and plasma, the protein emerges over a broad range corresponding to sizes from about 2000 kDa to less than 200 kDa. The NH2-terminal sequence (AAENRNQXPPG) shows no significant homology with known proteins. Because of the characteristic appearance in non-reducing SDS-PAGE and the lectin activity, we propose to name the protein 'ladderlectin'.
Original language | English |
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Pages (from-to) | 385-390 |
Number of pages | 6 |
Journal | Comparative Biochemistry and Physiology - B Biochemistry and Molecular Biology |
Volume | 116 |
Issue number | 4 |
DOIs | |
State | Published - Apr 1997 |
Keywords
- Animals
- Blotting, Western
- Calcium/metabolism
- Carbohydrate Metabolism
- Chromatography, Affinity/methods
- Chromatography, Liquid/methods
- Electrophoresis, Polyacrylamide Gel/methods
- Fish Proteins
- Lectins/immunology
- Oncorhynchus mykiss/blood
- Sequence Homology, Amino Acid
- Substrate Specificity