Neuregulin-1-stimulated phosphorylation of GABP in skeletal muscle cells

Biochemistry
L Fromm, S J Burden

Abstract

Localization of acetylcholine receptors (AChRs) to neuromuscular synapses is mediated, in part, through selective transcription of AChR genes in myofiber synaptic nuclei. Neuregulin-1 (NRG-1) is a good candidate for the extracellular signal that induces synapse-specific gene expression, since NRG-1 is concentrated at synaptic sites and activates AChR synthesis in cultured muscle cells. NRG-1-induced transcription requires activation of Erk and Jnk MAP kinases, but the downstream substrates that mediate this transcriptional response are not known. Previous studies have demonstrated that a consensus binding site for Ets proteins is required both for NRG-1-induced transcription and for synapse-specific transcription in transgenic mice. This regulatory element binds GABPalpha, an Ets protein, and GABPbeta, a protein that dimerizes with GABPalpha, raising the possibility that phosphorylation of GABP by MAP kinases induces transcription of AChR genes. To determine whether MAP kinases might directly regulate the activity of GABP, we studied MAP kinase-catalyzed and NRG-1-induced phosphorylation of GABPalpha and GABPbeta. We show that GABPalpha and GABPbeta are phosphorylated in vitro by Erk and by Jnk. Using recombinant proteins conta...Continue Reading

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Citations

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