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• W1595691405 abstract "[125I-Tyr10]Monoiodoglucagon [( 125I]MIG) was cross-linked to liver membrane glucagon receptors with hydroxysuccinimidyl-p-azidobenzoate, and the products were analyzed by sodium dodecyl sulfate-gel electrophoresis. Autoradiograms of the gel obtained after a 24-h exposure showed one major band at Mr = 63,000 that was sensitive to GTP and excess unlabeled glucagon. Exposure for 7 days showed labeling of an additional Mr = 33,000 species that was also sensitive to excess unlabeled glucagon. The Mr = 33,000 peptide can be obtained by subtilisin, trypsin, elastase, or Staphylococcus aureus V8 protease treatment of the [125I]MIG-occupied receptor in the membrane or in Lubrol-PX solution. In contrast, limited proteolysis of membranes containing vacant receptors results in labeling of a Mr = 24,000 peptide. The Mr = 24,000 peptide specifically binds [125I]MIG in a GTP-sensitive manner. The Mr = 33,000 peptide also retains GTP sensitivity since it releases bound [125I]MIG upon addition of GTP. Elastase treatment of the electroeluted Mr = 33,000 peptide yields the Mr = 24,000 and 15,000 fragments. The Mr = 15,000 peptide is the smallest fragment of the receptor as yet identified. Treatment of the Mr = 63,000 receptor with [125I]MIG cross-linked to it with endo-beta-N-acetylglucosaminidase F results in four distinct fragments with Mr values of 61,000, 56,000, 51,000, and 45,000; prolonged treatment resulted in the accumulation of the last two. Neither the Mr = 33,000 nor the Mr = 24,000 fragment appeared to be substrates for endo-beta-N-acetylglucosaminidase F. These data indicate that glucagon receptor is a glycoprotein of approximately 60,000 daltons which contains at least four N-linked glycans accounting for 18,000 daltons of its mass. Both its glucagon binding function and its capacity to interact with the stimulatory regulator of adenylyl cyclase are contained within a fragment of only approximately 21,000 daltons that does not contain any N-linked glycans. Hormone occupancy of the receptor results in a conformational change so as to expose a region that is susceptible to proteolysis by proteases of varying specificities to yield a peptide of approximately 30,000 daltons that also does not contain N-linked glycans." @default.
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• W1595691405 date "1984-04-01" @default.
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• W1595691405 title "Structural analysis of the hepatic glucagon receptor. Identification of a guanine nucleotide-sensitive hormone-binding region." @default.
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• W1595691405 doi "https://doi.org/10.1016/s0021-9258(17)42978-4" @default.
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