Visualization of ligand-induced transmembrane signaling in the full-length human insulin receptor

Insulin receptor (IR) signaling plays a critical role in the regulation of metabolism and growth in multicellular organisms. IRs are unique among receptor tyrosine kinases in that they exist exclusively as covalent (αβ) homodimers at the cell surface. Transmembrane signaling by the IR can therefore...

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Veröffentlicht in:The Journal of cell biology 2018-05, Vol.217 (5), p.1643-1649
Hauptverfasser: Gutmann, Theresia, Kim, Kelly H, Grzybek, Michal, Walz, Thomas, Coskun, Ünal
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container_issue 5
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container_title The Journal of cell biology
container_volume 217
creator Gutmann, Theresia
Kim, Kelly H
Grzybek, Michal
Walz, Thomas
Coskun, Ünal
description Insulin receptor (IR) signaling plays a critical role in the regulation of metabolism and growth in multicellular organisms. IRs are unique among receptor tyrosine kinases in that they exist exclusively as covalent (αβ) homodimers at the cell surface. Transmembrane signaling by the IR can therefore not be based on ligand-induced dimerization as such but must involve structural changes within the existing receptor dimer. In this study, using glycosylated full-length human IR reconstituted into lipid nanodiscs, we show by single-particle electron microscopy that insulin binding to the dimeric receptor converts its ectodomain from an inverted U-shaped conformation to a T-shaped conformation. This structural rearrangement of the ectodomain propagates to the transmembrane domains, which are well separated in the inactive conformation but come close together upon insulin binding, facilitating autophosphorylation of the cytoplasmic kinase domains.
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Binding
Cell growth
Cell surface
Cytoplasm
Dimerization
Dimers
Electron microscopy
Insulin
Kinases
Ligands
Lipids
Metabolism
Signaling
T shape
Transmembrane domains
Tyrosine
title Visualization of ligand-induced transmembrane signaling in the full-length human insulin receptor
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