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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Positive regulation of the cAMP-responsive activator CREM by the p70 S6 kinase: an alternative route to mitogen-induced gene expression.

Activation of the adenylyl cyclase signaling pathway elicits the induction of genes via activators binding to cAMP-responsive elements (CREs). Nuclear factor CRE modulator (CREM) is activated by PKA-mediated phosphorylation on a serine at position 117. We show that Ser-117 is also phosphorylated by the mitogen-activated p70 S6 kinase (p70S6K) in vitro. Activation of cellular p70S6K by serum factors enhances Ser-117 phosphorylation and CREM transactivation. Coexpression of p70S6K significantly increases transactivation by a GAL4-CREM fusion. The macrolide rapamycin, a potent and specific inhibitor of p70S6K in vivo, completely blocks CREM activation induced by serum and by p70S6K. Thus, CREM constitutes a target for mitogenic signaling through p70S6K and may acts as a nuclear effector in which transduction pathways may converge and cross-talk.[1]


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