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Stabilization of C5a receptor–G-protein interactions through ligand binding

✍ Scribed by Lawrence P. Wennogle; Lynnette Conder; Cindy Winter; Albert Braunwalder; Sid Vlattas; Richard Kramer; Catherine Cioffi; Shou-Ih Hu

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
764 KB
Volume
55
Category
Article
ISSN
0730-2312

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✦ Synopsis

Binding of biotin-Csa to the C5a receptor in membrane fragments followed by detergent solubilization and purification with streptavidin-agarose affinity chromatography resulted in the isolation of a receptor complex with associated G-proteins. In contrast, when receptor was detergent-solubilized in the absence of C5a and purified by affinity chromatography with Affigel-C5a, G-proteins did not copurify. Since the results indicate that receptor ligation stabilized the receptor-G-protein interaction to allow purification of the complex, the findings emphasize the dynamic nature of the C5a receptor-effector interactions. When biotin-C5a-ligated receptor was purified from a mouse cell line overexpressing recombinant human receptor, both Gialphaz and Gialpha3 subunits copurified, confirming that multiple transducing systems are linked to the C5a receptor. The method of stabilization of receptor-transducer complexes offers the opportunity to further elaborate the interactions of the C5a receptor with diverse transducing elements and second messenger systems.

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