5U1M

Structure of the IRS-1 PTB Domain Bound to the Juxtamembrane Region of the Insulin Receptor

Summary for 5U1M

• Entry DOI: 10.2210/pdb5u1m/pdb
• Descriptor: Insulin receptor substrate 1, Insulin receptor (3 entities in total)
• Functional Keywords: ptb domain, insulin receptor substrate-1, phosphopeptide, insulin receptor, protein binding
• Biological source: Homo sapiens (Human); More
• Cellular location: Cell membrane; Single-pass type I membrane protein: P06213
• Total number of polymer chains: 2
• Total formula weight: 12923.84

Authors

Eck, M.J.,Dhe-Paganon, S. (deposition date: 2016-11-28, release date: 2017-09-13, Last modification date: 2024-11-06)

Primary citation

Cai, W.,Sakaguchi, M.,Kleinridders, A.,Gonzalez-Del Pino, G.,Dreyfuss, J.M.,O'Neill, B.T.,Ramirez, A.K.,Pan, H.,Winnay, J.N.,Boucher, J.,Eck, M.J.,Kahn, C.R.
Domain-dependent effects of insulin and IGF-1 receptors on signalling and gene expression.
Nat Commun, 8:14892-14892, 2017

PubMed Abstract: Despite a high degree of homology, insulin receptor (IR) and IGF-1 receptor (IGF1R) mediate distinct cellular and physiological functions. Here, we demonstrate how domain differences between IR and IGF1R contribute to the distinct functions of these receptors using chimeric and site-mutated receptors. Receptors with the intracellular domain of IGF1R show increased activation of Shc and Gab-1 and more potent regulation of genes involved in proliferation, corresponding to their higher mitogenic activity. Conversely, receptors with the intracellular domain of IR display higher IRS-1 phosphorylation, stronger regulation of genes in metabolic pathways and more dramatic glycolytic responses to hormonal stimulation. Strikingly, replacement of leucine in the juxtamembrane region of IR to phenylalanine, which is present in IGF1R, mimics many of these signalling and gene expression responses. Overall, we show that the distinct activities of the closely related IR and IGF1R are mediated by their intracellular juxtamembrane region and substrate binding to this region.

PubMed: 28345670
DOI: 10.1038/ncomms14892

Experimental method

X-RAY DIFFRACTION (1.8 Å)