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• W1605981237 abstract "Insulin receptors from turkey erythrocyte plasma membranes were solubilized in nondenaturing detergents (Triton X-100 and sodium deoxycholate). Their hydrodynamic properties were determined by sedimentation analyses in H2O and D2O, and gel filtration on Sepharose 4B. Two specific insulin-binding species are observed after velocity sedimentation in linear sucrose density gradients: peaks I and II. In Triton X-100, the sedimentation coefficient (s20,w), partial specific volume (Vc), and Stokes radius (a) for peaks I and II are, respectively, 10.2 +/- 0.5 S and 6.6 +/- 0.5 S, 0.75 +/- 0.02 ml/g, and 0.76 +/- 0.02 ml/g, and 89 +/- 3 A and 76 +/- 3 A, to yield Mr = 410,000 +/- 75,000 and 235,000 +/- 55,000, respectively, for the protein-Triton X-100 complex. The corresponding values in deoxycholate solution are: 10.7 +/- 0.5 S and 6.9 +/- 0.5 S, 0.71 +/- 0.03 ml/g and 0.70 +/- 0.04 ml/g, and 86 +/- 3 A and 69 +/- 3 A for peaks I and II, respectively, to yield 360,000 +/- 65,000 and 180,000 +/- 45,000, respectively, for the molecular weight of the protein-deoxycholate complex. These data are consistent with a model whereby each receptor species binds to one micelle of the appropriate detergent. In agreement with this model, it was also found that, in both Triton X-100 and deoxycholate, concentrations higher than the critical micellar concentration are required in order to maintain discrete receptor species in solution. At concentrations below the critical micellar concentration, the receptors aggregate to a broad band that sediments faster than 11.3 S. This is typical of membrane proteins that are stabilized in solution by insertion into detergent micelles. Based on these results, the protein molecular weights of peaks I and II are estimated to be 355,000 +/- 65,000 and 180,000 +/- 45,000, respectively. When membranes are treated with the reducing agent dithiothreitol, peak I is converted to peak II. This fact, together with the estimates obtained for the protein molecular weights of the two receptor species, suggests that peak I is a disulfide-linked dimer of peak II. The sedimentation characteristics of insulin receptors in many different cell types appear to be similar. As with turkey erythrocytes, detergent extracts of membranes from rat liver contained two native receptor species whose sedimentation coefficients were similar to peaks I and II. However, in all the other cell types examined, including rat adipocytes, rat heart muscle, 3T3-L1 adipocytes, 3T3-C2 fibroblasts, and FAO hepatoma cells, peak I (the native dimer) was the predominant species observed." @default.
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• W1605981237 date "1983-12-01" @default.
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• W1605981237 title "Structural characterization of insulin receptors. I. Hydrodynamic properties of receptors from turkey erythrocytes." @default.
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• W1605981237 doi "https://doi.org/10.1016/s0021-9258(17)43761-6" @default.
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