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Published on: May 4, 2012
Characterization of a lectin from goat peripheral blood lymphocytes
1School of Life Sciences, Devi Ahilya Vishwavidyalaya, Indore, India.
Insights
Researchers isolated a D-glucose specific lectin from goat lymphocytes. This glycoprotein exhibits hemagglutinating activity dependent on divalent cations, offering insights into immune cell interactions.
Area of Science:
- Immunology
- Biochemistry
- Glycobiology
Background:
- Lectins are carbohydrate-binding proteins crucial for biological recognition.
- Peripheral blood lymphocytes play key roles in the immune system.
- Understanding lectin function can elucidate cellular interactions and immune responses.
Purpose of the Study:
- To isolate and characterize a D-glucose specific lectin from goat peripheral blood lymphocytes.
- To determine the lectin's biochemical properties and functional activity.
- To investigate the lectin's potential role in cellular interactions.
Main Methods:
- Affinity chromatography using N-acetyl D-glucosamine agarose gel for lectin isolation.
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for molecular weight determination.
- Gel filtration chromatography (Sephacryl S 500) for native molecular weight and Stoke's radius.
- Assays for hemagglutination activity, cation dependence, and optimal binding conditions.
Main Results:
- A D-glucose specific lectin was successfully isolated from goat lymphocytes.
- The lectin has a molecular weight of approximately 112-114 kDa and is a glycoprotein with 5.6% neutral hexose and 5.5% sialic acid.
- The lectin demonstrated hemagglutinating activity against trypsinized rabbit and human type A erythrocytes, dependent on Mn2+ and Ca2+.
- Optimal binding conditions were identified at pH 7.5, 0.16 ionic strength, and 30-37°C.
Conclusions:
- A novel D-glucose specific lectin was characterized from goat lymphocytes.
- The lectin's properties suggest a role in cellular recognition and adhesion, potentially involving carbohydrate interactions.
- Further research into this lectin could reveal specific functions in goat immunology and related fields.
Abstract:
A D-glucose specific lectin was isolated from goat peripheral blood lymphocytes by affinity chromatography on N-acetyl D-glucosamine agarose gel. The fluorescence intensity of 4 methyl umbelliferyl D-glucose was quenched to about 62% on addition of the lectin. This lectin gave a single band corresponding to 112 kDa in SDS-PAGE irrespective of treatment with 2-mercaptoethanol. The molecular weight and the Stoke's radius of the lectin in the native conditions were found to be 114 kDa and 4.54 nm, respectively, as determined by gel filtration on Sephacryl S 500 column. The lectin was found to be a glycoprotein with 5.6% of neutral hexose content and 5.5% of sialic acid. The lectin agglutinated trypsinized rabbit erythrocytes and human type A erythrocytes. The hemagglutinating activity was dependent on the presence of divalent cations like Mn2+ and Ca2+. Optimum pH, ionic strength and temperature for rebinding of lectin to acid treated Sephadex G200 were found to be 7.5, 0.16 and 30-37 degrees C, respectively.
