2b4s | pdb_00002b4s
Crystal structure of a complex between PTP1B and the insulin receptor tyrosine kinase
Structural highlights
FunctionPTN1_HUMAN Tyrosine-protein phosphatase which acts as a regulator of endoplasmic reticulum unfolded protein response. Mediates dephosphorylation of EIF2AK3/PERK; inactivating the protein kinase activity of EIF2AK3/PERK. May play an important role in CKII- and p60c-src-induced signal transduction cascades. May regulate the EFNA5-EPHA3 signaling pathway which modulates cell reorganization and cell-cell repulsion.[1] [2] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedProtein tyrosine phosphatase 1B (PTP1B) is a highly specific negative regulator of insulin receptor signaling in vivo. The determinants of PTP1B specificity for the insulin receptor versus other receptor tyrosine kinases are largely unknown. Here, we report a crystal structure at 2.3 A resolution of the catalytic domain of PTP1B (trapping mutant) in complex with the phosphorylated tyrosine kinase domain of the insulin receptor (IRK). The crystallographic asymmetric unit contains two PTP1B-IRK complexes that interact through an IRK dimer interface. Rather than binding to a phosphotyrosine in the IRK activation loop, PTP1B binds instead to the opposite side of the kinase domain, with the phosphorylated activation loops sequestered within the IRK dimer. The crystal structure provides evidence for a noncatalytic mode of interaction between PTP1B and IRK, which could be important for the selective recruitment of PTP1B to the insulin receptor. Crystal structure of a complex between protein tyrosine phosphatase 1B and the insulin receptor tyrosine kinase.,Li S, Depetris RS, Barford D, Chernoff J, Hubbard SR Structure. 2005 Nov;13(11):1643-51. PMID:16271887[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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