Document Detail

Adipocyte insulin-binding species: the 40 A Stoke's radius protein.
MedLine Citation:
PMID:  6383574     Owner:  NLM     Status:  MEDLINE    
Several laboratories have demonstrated the presence of large (70 A) (1 A = 0.1 nm) and small (40 A) insulin receptors. This report provides evidence that the 40 A insulin receptor migrates on dodecyl sulfate - acrylamide gel electrophoresis as a 90 000 dalton protein and that this protein is a single polypeptide chain. 125I-labeled insulin was bound to plasma membranes from isolated rat adipocytes. Following removal of unbound 125I-labeled insulin, the mixture was exposed to disuccinimidyl suberate. Proteins tagged with 125I-labeled insulin were separated by dodecyl sulfate gel electrophoresis or Sepharose 6B chromatography. Autoradiography of the gels demonstrated several large (relative mass (Mr) greater than 300 000) and one small (Mr approximately 90 000) labeled protein in nonreduced membrane proteins. Dithiothreitol reduction decreased the large insulin-binding species to its known subunits, but the 90 000 dalton protein did not decrease in size. Triton X-100 solubilized plasma membranes were separated by Sepharose 6B chromatography. One labeled protein, with Kav = 0.57 elution position, on dodecyl sulfate gel electrophoresis migrated as a 90 000 dalton protein. Thus, rat adipocyte plasma membranes contain both an oligomeric insulin-binding species and a monomeric insulin-binding species. The relationship of the monomeric to the oligomeric insulin receptor is discussed.
C Elliott; H J Goren
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of biochemistry and cell biology = Revue canadienne de biochimie et biologie cellulaire     Volume:  62     ISSN:  0714-7511     ISO Abbreviation:  Can. J. Biochem. Cell Biol.     Publication Date:  1984 Jul 
Date Detail:
Created Date:  1984-11-14     Completed Date:  1984-11-14     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8302763     Medline TA:  Can J Biochem Cell Biol     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  566-70     Citation Subset:  IM    
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MeSH Terms
Adipose Tissue / analysis*
Cell Membrane / analysis
Chromatography, Gel
Dithiothreitol / pharmacology
Electrophoresis, Polyacrylamide Gel
Insulin / metabolism
Macromolecular Substances
Molecular Weight
Rats, Inbred Strains
Receptor, Insulin / analysis*
Reg. No./Substance:
0/Macromolecular Substances; 11061-68-0/Insulin; 3483-12-3/Dithiothreitol; EC, Insulin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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