Insulin receptor precursor7101)

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Revision as of 07:58, 13 February 2009

Contents 1 Source Organism 2 Taxomomy 3 Subcellular Localization 4 Developmental Stage 5 Similarity 6 Post translational Modification 7 Function

Source Organism

Homo sapiens (Human).

Taxomomy

Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini;Catarrhini; Hominidae; Homo.

Subcellular Localization

Membrane; Single-pass type I membrane protein.

Developmental Stage

Similarity

Belongs to the protein kinase superfamily. Tyr protein kinase family. Insulin receptor subfamily. Contains 2 fibronectin type-III domains. Contains 1 protein kinase domain.

Post translational Modification

After being transported from the endoplasmic reticulum to the Golgi apparatus, the single glycosylated precursor is further glycosylated and then cleaved, followed by its transport to the plasma membrane. Autophosphorylated on tyrosine residues in response to insulin. Phosphorylation of Tyr-999 is required for IRS1- and SHC1- binding.

Function

This receptor binds insulin and has a tyrosine-protein kinase activity. Isoform Short has a higher affinity for insulin. Mediates the metabolic functions of insulin. Binding to insulin stimulates association of the receptor with downstream mediators including IRS1 and phosphatidylinositol 3'-kinase (PI3K). Can activate PI3K either directly by binding to the p85 regulatory subunit, or indirectly via IRS1.

Categories:Receptors