Immunochemical study of the cyclic nucleotide system of retinal photoreceptor membranes: antibodies raised to phosphodiesterase, its protein inhibitor and GTP-binding proteins.

Monospecific precipitating antibodies raised to phosphodiesterase, its protein inhibitor and GTP-binding proteins of bovine retina photoreceptor membranes were obtained. The characterization of the antibodies was carried out by immunochemical methods and according to their functional properties as determined by their effect on enzyme activities. The antibodies were used to study the distribution of immunolike proteins in different animal retinas and to purify the inhibitor protein by the method of immunoaffinity chromatography.