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Mol. Cell. Biol., 04 1996, 1550-1556, Vol 16, No. 4
Copyright © 1996, American Society for Microbiology

Analysis of the ERK-stimulated ETS transcription factor ER81

R Janknecht
Institute for Molecular Biology, Hannover Medical School, Germany.

A plethora of extracellular signals leads to the stimulation of Ras, which triggers intracellular protein kinase cascades, resulting in activation of transcription factors and thus in enhanced gene activity. In this report, it is demonstrated that the ETS transcription factor ER81, which appears to be localized within the cell nucleus by virtue of its DNA binding domain, is transcriptionally activated by oncogenic Ras. Since this activation was dependent on the presence of Raf-1 and ERK-1, ER81 is a target of the Ras/Raf/MEK/ERK signaling cascade. Consistently, activated ERK-1 is capable to phosphorylate ER81. However, the carboxy-terminal region of ER81, which contains no potential ERK phosphorylation sites, is also transcriptionally activated by ERK-1, suggesting that an ERK-stimulated protein kinase phosphorylates and thus stimulates ER81 activity. Two acidic stretches of amino acids, which are conserved in the related PEA3 and ERM proteins, are localized within the amino-and carboxy-terminal transactivation domains of ER81. In addition, an inhibitory domain may dampen the activation function of these two domains. In conclusion, ER81 is a target of Ras-dependent signaling cascades and may thus contribute to the nuclear response upon stimulation of cells and also to cellular transformation due to oncogenic Ras.


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