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Developmentally regulated, carbohydrate-binding protein in Dictyostelium discoideum
Summary
Researchers identified a novel carbohydrate-binding protein in Dictyostelium discoideum cells that appears to mediate cell adhesion. This protein
Area of Science:
- Cellular and Molecular Biology
- Developmental Biology
- Biochemistry
Background:
- Dictyostelium discoideum undergoes significant cellular changes upon starvation.
- Cell-cell adhesion is crucial for multicellular development in slime molds.
Purpose of the Study:
- To identify and characterize proteins involved in intercellular adhesion during Dictyostelium discoideum development.
- To investigate the role of carbohydrate-binding proteins in slime mold cell cohesion.
Main Methods:
- Assay of carbohydrate-binding protein activity using sheep erythrocyte agglutination.
- Protein purification via affinity chromatography on Sepharose 4B with D-galactose elution.
- Analysis of monosaccharide inhibition of protein-erythrocyte binding.
Main Results:
- A carbohydrate-binding protein synthesized 3-9 hours post-starvation agglutinates erythrocytes.
- D-galactose, N-acetyl-D-galactosamine, and L-fucose inhibited agglutination.
- The purified protein is localized on the surface of cohesive slime mold cells.
Conclusions:
- A specific carbohydrate-binding protein is implicated in the intercellular adhesion of Dictyostelium discoideum.
- This protein may play a key role in the transition from single cells to a multicellular aggregate.