Insulin Receptor Substrate 4 (IRS4) ELISA Kit for Human

IRS4 encodes the insulin receptor substrate 4, a cytoplasmic protein that contains many potential tyrosine and serine/threonine phosphorylation sites. Tyrosine-phosphorylated IRS4 protein has been shown to associate with cytoplasmic signalling molecules that contain SH2 domains. The IRS4 protein is phosphorylated by the insulin receptor tyrosine kinase upon receptor stimulation.. [provided by RefSeq, Jul 2008]

IRS4: Acts as an interface between multiple growth factor receptors possessing tyrosine kinase activity, such as insulin receptor, IGF1R and FGFR1, and a complex network of intracellular signaling molecules containing SH2 domains. Involved in the IGF1R mitogenic signaling pathway. Promotes the AKT1 signaling pathway and BAD phosphorylation during insulin stimulation without activation of RPS6KB1 or the inhibition of apoptosis. Interaction with GRB2 enhances insulin-stimulated mitogen-activated protein kinase activity. May be involved in nonreceptor tyrosine kinase signaling in myoblasts. Plays a pivotal role in the proliferation/differentiation of hepatoblastoma cell through EPHB2 activation upon IGF1 stimulation. May play a role in the signal transduction in response to insulin and to a lesser extent in response to IL4 and GH on mitogenesis. Plays a role in growth, reproduction and glucose homeostasis. May act as negative regulators of the IGFI signaling pathway by suppressing the function of IRS1 and IRS2.

Protein type: Adaptor/scaffold

Chromosomal Location of Human Ortholog: Xq22.3

Cellular Component: cytosol; plasma membrane

Molecular Function: insulin receptor binding; phosphoinositide 3-kinase binding; protein binding; SH3/SH2 adaptor activity; signal transducer activity

Biological Process: insulin receptor signaling pathway; positive regulation of signal transduction; regulation of lipid metabolic process; signal transduction