Rsk-3 is a member of a family of 90-kDa ribosomal protein S6 kinases, which includes Rsk-1, Rsk-2 and Rsk-3. These are broadly expressed serine/threonine protein kinases (1) that are activated in response to mitogenic stimuli, including extracellular signal-regulated protein kinases Erk1 and Erk2 (2). Rsk-3 is a distinct isoform of p90Rsk that translocates to the cell nucleus, phosphorylates potential nuclear targets, and may have a unique upstream activator (3). Several sites, such as Ser380, Thr359, Ser363 and Thr573, are important for its activation. Active Rsks appear to play a major role in transcriptional regulation by translocating to the nucleus and phosphorylating c-Fos and CREB (2,4).
EGFR1 Signaling Pathway
MAPK signaling pathway
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