Protein immobilization on the surface of liposomes via carbodiimide activation in the presence of N-hydroxysulfosuccinimide

Add time:07/31/2019    Source:sciencedirect.com

A method of the covalent immobilization of proteins on the surface of liposomes, containing 10% (by mol) of N-glutaryl phosphatidylethanolamine, is described. Carboxylic groups of liposomal N-glutaryl phosphatidylethanolamine were activated in the presence of water-soluble carbodiimide and N-hydroxysulfosuccinimide and reacted subsequently with protein amino groups. The liposome-protein conjugates formed contained up to 5 × 10−4 mol protein/mol lipid. Lectins (RCAI and WGA) upon immobilization on liposomes retained saccharide specificity and the ability to agglutinate red blood cells. The immobilization of mouse monoclonal IgG in a ratio of 3.5 × 10−4 mol IgG/mol lipid was achieved. The liposome activation in the absence of N-hydroxysulfosuccinimide resulted in a 2-fold decrease of protein coupling yields.

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