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IGF1R, also known as Insulin-like Growth Factor 1 (IGF-1) Receptor, is a receptor tyrosine kinase activated by IGF-1 and IGF-2. IGFR has been implicated in a variety of cancers. The protein is a tetramer consisting of two alpha, and two beta subunits. The alpha-subunits binds to insulin growth factor 1 with higher affinity than to insulin growth factor 2. Binding results in a conformational change, followed by autophosphorylation of IGF-1R at positions 1134, 1135, 1136. The activated IGF-1R in turn, causes phosphorylation of substrate proteins, followed by sequential activation of RAS, RAF, and mitogen-activated protein kinase isoforms ERK, p38, and JNK, leading to the transcription of genes that drive proliferation.
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Protein Aliases: CD221; CD221 antigen; IGF 1 receptor; IGF 1R; IGF-I receptor; Insulin like growth factor 1 receptor precursor; Insulin-like growth factor 1 receptor; Insulin-like growth factor I receptor; soluble IGF1R variant 1; soluble IGF1R variant 2
Gene Aliases: CD221; IGF1R; IGFIR; IGFR; JTK13
UniProt ID: (Human) P08069
Entrez Gene ID: (Human) 3480
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