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CD46 (membrane cofactor protein) associates with multiple beta1 integrins and tetraspans
S Lozahic1, D Christiansen, S Manié
1INSERM U268, Hôpital Paul Brousse, Villejuif, France.
European Journal of Immunology
|March 31, 2000
Summary
Tetraspanins interact with cell surface molecules. Researchers found that complement regulator CD46 (membrane cofactor protein) associates with beta1 integrins and tetraspanins, revealing new insights into cell surface complex formation.
Area of Science:
- Cell Biology
- Immunology
- Molecular Interactions
Background:
- Tetraspanins are cell surface proteins known to associate with numerous other molecules.
- Understanding these molecular complexes is crucial for deciphering cellular functions and signaling pathways.
Purpose of the Study:
- To characterize novel tetraspanin complexes.
- To investigate the association of complement regulator CD46 (membrane cofactor protein) with tetraspanins and integrins.
Main Methods:
- Generation and selection of monoclonal antibodies (mAbs) targeting CD9-associated molecules.
- Immunoprecipitation assays to identify interacting proteins.
- Cross-linking experiments in living cells.
Main Results:
- A unique mAb identified CD46 (membrane cofactor protein) as a molecule associated with CD9.
- CD46 was found to associate with several tetraspanins and all tested beta1 integrins, but not beta4 integrins.
- Cross-linking confirmed direct CD46/beta1 integrin complexes and indirect associations with tetraspanins in living cells.
Conclusions:
- CD46 (membrane cofactor protein) directly associates with beta1 integrins and indirectly with tetraspanins.
- These findings elucidate novel molecular interactions on the cell surface.
- CD46's role as a measles virus receptor was not affected by integrin or tetraspanin modulation during viral entry.