PMID: 6986166Jan 8, 1980Paper

Photoaffinity labeling of insulin receptor proteins of liver plasma membrane preparations

Biochemistry
C C YipM L Moule

Abstract

The photoreactive insulin derivatives N epsilon B29-(azidobenzoyl)insulin (MAB-insulin) and N alpha A1, N epsilon B29-di(azidobenzoyl)insulin (DAB-insulin) were synthesized by reacting bovine insulin with the N-hydroxysuccinimide ester of 4-azidobenzoic acid. These derivatives were purified by ion exchange chromatography on SP-Sephadex, and their identities were established by polyacrylamide gel electrophoresis, amino acid analysis, and end-group determination. Their biological activities were measured by receptor binding assay and fat cell assay. The photoreactivity of these two derivatives was demonstrated by spectral changes and by the formation of covalent polymers of high molecular weight when exposed to light. Radioactive MAB-insulin and DAB-insulin were prepared by iodination with [125I]iodine. These radioactive derivatives were characterized for their photoreactivity, immunoreactivity, and receptor binding to liver plasma membrane. Liver plasma membrane preparations of rat, mouse, and guinea pig were incubated with these radioactive insulin derivatives and irradiated with light. Sodium dodecyl sulfate gel electrophoresis of these plasma membrane preparations after solubilization and reduction showed that two proteins we...Continue Reading

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