Growth hormone-promoted tyrosyl phosphorylation of SHC proteins and SHC association with Grb2.

The Journal of Biological Chemistry
J VanderKuurC Carter-Su

Abstract

Growth hormone (GH) has been shown to stimulate the mitogen-activated protein (MAP) kinases designated ERKs (extracellular signal regulated kinases) 1 and 2. One pathway by which ERKs 1 and 2 are activated by tyrosine kinases involves the Src homology (SH)-2 containing proteins SHC and Grb2. To gain insight into pathways coupling GH receptor (GHR) to MAP kinase activation and signaling molecules that might interact with GHR and its associated tyrosine kinase JAK2, we examined whether SHC and Grb2 proteins serve as signaling molecules for GH. Human GH was shown to promote the rapid tyrosyl phosphorylation of 66-, 52-, and 46-kDa SHC proteins in 3T3-F442A fibroblasts. GH also promoted binding of GHR and JAK2 to the SH2 domain of 46/52-kDa SHC protein fused to glutathione S-transferase (GST). Constitutively phosphorylated JAK2, from COS-7 cells transiently transfected with murine JAK2 cDNA, bound to SHC SH2-GST fusion protein, demonstrating that the SHC SH2 domain can bind tyrosyl-phosphorylated JAK2 in the absence of GHR. Regions of GHR required for GH-dependent tyrosyl phosphorylation of SHC were examined using Chinese hamster ovary cells expressing mutated rat GHR. In cells expressing GHR1-638 and GHR1-638(Y333,338F), GH stimul...Continue Reading

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