Characterization of solubilized insulin receptors from rat liver microsomes. Existence of two receptor species with different binding properties

R. Koch, A. Deger, H. M. Jack, K. N. Klotz, D. Schenzle, H. Krämer, S. Kelm, G. Müller, R. Rapp, U. Weber

Research output: Contribution to journalArticle

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Abstract

Insulin receptors were solubilized from rat liver microsomes by the nonionic detergent Triton X-100. After gel filtration of the extract on Sepharose CL-6B, two insulin-binding species (peak I and peak II) were obtained. The structure and binding properties of both peaks were characterized. Gel filtration yielded Stokes radii of 9.2 nm (peak I) and 8.0 nm (peak II). Both peaks were glycoproteins. At 4°C peak I showed optimal insulin binding at pH 8.0 and high ionic strength. In contrast, peak II had its binding optimum at pH 7.0 and low ionic strength, where peak I binding was minimal. For peak I the change in insulin binding under different conditions of pH and ionic strength due to a change in receptor affinity only. For peak II an additional change in receptor number was found. Both peaks yielded non-linear Scatchard plots under most of the buffer conditions examined. At their binding optima at 4°C the high affinity dissociation constants were 0.50 nM (peak I) and 0.55 nM (peak II). Sodium dodecyl sulfate/polyacrylamide gel electrophoresis of peak I revealed five receptor bands with M(r) 400,000, 365,000, 320,000, 290,000, and 245,000 under non-reducing conditions. For peak II two major receptor bands with M(r) 210,000 and 115,000 were found. The peak II receptor bands were also obtained after mild reduction of peak I. After complete reduction both peaks showed one major receptor band with M(r) 130,000. The reductive generation of the peak II receptor together with molecular mass estimations suggest that the peak I receptor is the disulfide-linked dimer of the peak II receptor. Thus, Triton extracts from rat liver microsomes contain two receptor sepcies, which are related, but differ considerably in their size and insulin-binding properties.

Original languageEnglish (US)
Pages (from-to)281-287
Number of pages7
JournalEuropean Journal of Biochemistry
Volume154
Issue number2
StatePublished - 1986

Fingerprint

Insulin Receptor
Liver Microsomes
Liver
Rats
Ionic strength
Osmolar Concentration
Insulin
Gel Chromatography
Gels
Octoxynol
Molecular mass
Electrophoresis
Sodium Dodecyl Sulfate
Disulfides
Detergents
Dimers
Polyacrylamide Gel Electrophoresis
Glycoproteins
Buffers

ASJC Scopus subject areas

  • Biochemistry

Cite this

Characterization of solubilized insulin receptors from rat liver microsomes. Existence of two receptor species with different binding properties. / Koch, R.; Deger, A.; Jack, H. M.; Klotz, K. N.; Schenzle, D.; Krämer, H.; Kelm, S.; Müller, G.; Rapp, R.; Weber, U.

In: European Journal of Biochemistry, Vol. 154, No. 2, 1986, p. 281-287.

Research output: Contribution to journalArticle

Koch, R, Deger, A, Jack, HM, Klotz, KN, Schenzle, D, Krämer, H, Kelm, S, Müller, G, Rapp, R & Weber, U 1986, 'Characterization of solubilized insulin receptors from rat liver microsomes. Existence of two receptor species with different binding properties', European Journal of Biochemistry, vol. 154, no. 2, pp. 281-287.
Koch, R. ; Deger, A. ; Jack, H. M. ; Klotz, K. N. ; Schenzle, D. ; Krämer, H. ; Kelm, S. ; Müller, G. ; Rapp, R. ; Weber, U. / Characterization of solubilized insulin receptors from rat liver microsomes. Existence of two receptor species with different binding properties. In: European Journal of Biochemistry. 1986 ; Vol. 154, No. 2. pp. 281-287.
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AU - Koch, R.

AU - Deger, A.

AU - Jack, H. M.

AU - Klotz, K. N.

AU - Schenzle, D.

AU - Krämer, H.

AU - Kelm, S.

AU - Müller, G.

AU - Rapp, R.

AU - Weber, U.

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