The oligosaccharide moiety of the beta 1-adrenergic receptor from turkey erythrocytes has a biantennary, N-acetyllactosamine-containing structure

The turkey erythrocyte beta 1-adrenergic receptor can be purified by affinity chromatography on alprenolol-Sepharose and characterized by photoaffinity labeling with N-(p-azido-m-[125I]iodobenzyl)-carazolol. Through the use of the specific glycosidases neuraminidase and endo-beta-N-acetylglucosaminidase H and affinity chromatography on lectin-Sepharose gels, we show here that the receptor is an N-glycosyl protein that contains complex carbohydrate chains. No high-mannose carbohydrate chains appear to be present. The binding of the radiolabeled antagonist dihydroalprenolol to the receptor is affected neither by the enzymic treatments nor by the presence of lectins, suggesting that the carbohydrate moiety is not involved in the catecholamine binding site.