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The in vitro synthesized and processed human insulin receptor precursor binds insulin
1Department of Medicine, John A. Burns School of Medicine, University of Hawaii-Manoa, Honolulu 96813, USA.
FEBS Letters
|September 16, 1999
Summary
Cell-free synthesis of the human insulin receptor precursor demonstrated its ability to bind insulin. This finding advances understanding of insulin receptor biogenesis and function.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- The human insulin receptor (hIR) is crucial for glucose homeostasis.
- Understanding hIR biogenesis is key to elucidating receptor function acquisition.
Purpose of the Study:
- To investigate the cell-free synthesis of human insulin receptor precursor components.
- To determine the insulin-binding ability of in vitro produced hIR.
Main Methods:
- Cell-free system for producing [35S]methionine-labeled hIR precursor.
- Insulin-linked biotin-streptavidin agarose and insulin affinity columns for binding assays.
- SDS-PAGE to analyze protein components and modifications.
Main Results:
- Processed 190 kDa proreceptor acquired insulin-binding capacity.
- Insulin-binding 190 kDa band showed slower migration on SDS-PAGE, suggesting post-translational modifications.
- Trypsin digestion retained binding, but alpha-subunit precursor binding was reduced.
Conclusions:
- A substantial portion of in vitro translated, processed insulin proreceptor gains insulin-binding ability.
- Cell-free examination provides insights into early stages of human insulin receptor functional acquisition.