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Accueil > Bibliographie > Phosphodiesterase-8A binds to and regulates Raf-1 kinase.

Phosphodiesterase-8A binds to and regulates Raf-1 (...)

Proc Natl Acad Sci U S A. 2013 Apr ;110(16):E1533-42
Phosphodiesterase-8A binds to and regulates Raf-1 kinase.
Brown KM, Day JP, Huston E, Zimmermann B, Hampel K, Christian F, Romano D, Terhzaz S, Lee LC, Willis MJ, Morton DB, Beavo JA, Shimizu-Albergine M, Davies SA, Kolch W, Houslay MD, Baillie GS.

V-raf-1 murine leukemia viral oncogene homolog 1 (Raf-1) is a key activator of the ERK pathway and is a target for cross-regulation of this pathway by the cAMP signaling system. The cAMP-activated protein kinase, PKA, inhibits Raf-1 by phosphorylation on S259. Here, we show that the cAMP-degrading phosphodiesterase-8A (PDE8A) associates with Raf-1 to protect it from inhibitory phosphorylation by PKA, thereby enhancing Raf-1’s ability to stimulate ERK signaling. PDE8A binds to Raf-1 with high (picomolar) affinity. Mapping of the interaction domain on PDE8A using peptide array technology identified amino acids 454-465 as the main binding site, which could be disrupted by mutation. A cell-permeable peptide corresponding to this region disrupted the PDE8A/Raf-1 interaction in cells, thereby reducing ERK activation and the cellular response to EGF. Overexpression of a catalytically inactive PDE8A in cells displayed a dominant negative phenotype on ERK activation. These effects were recapitulated at the organism level in genetically modified (PDE8A(-/-)) mice. Similarly, PDE8 deletion in Drosophila melanogaster reduced basal ERK activation and sensitized flies to stress-induced death. We propose that PDE8A is a physiological regulator of Raf-1 signaling in some cells.

PubMed

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