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Insulin receptor substrate 1
Protein found in humans / From Wikipedia, the free encyclopedia
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Insulin receptor substrate 1 (IRS-1) is a signaling adapter protein that in humans is encoded by the IRS1 gene.[5] It is a 131 kDa protein with amino acid sequence of 1242 residues.[6] It contains a single pleckstrin homology (PH) domain at the N-terminus and a PTB domain ca. 40 residues downstream of this, followed by a poorly conserved C-terminus tail.[7] Together with IRS2, IRS3 (pseudogene) and IRS4, it is homologous to the Drosophila protein chico, whose disruption extends the median lifespan of flies up to 48%.[8] Similarly, Irs1 mutant mice experience moderate life extension and delayed age-related pathologies.[9]
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