Abstract
Rat liver plasma membrane glucagon receptor has been purified with a yield of 0.01% to an estimated homogeneity of 32-60%, using a 2-stage electrophoretic procedure. SDS-solubilized membrane proteins labeled by the photoaffinity-agent, Ne-4-azidophenylamidinoglucagon (APA-glucagon), were separated by polyacrylamide gel electrophoresis in SDS-containing buffers. Gel slices corresponding to the molecular weight of the receptor were excised, electrophoretically extracted and concentrated. The concentrate was subjected to isoelectric focusing on Sephadex to yield a purified product in which the photoaffinity-labeled receptor, with a molecular weight of 56K and a pI' of 5.9, is the sole major component.
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