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Papers In Press, published online ahead of print December 16, 2003
Medicine Dept., Univ. of California San Diego, La Jolla, CA 92093-0652
Corresponding Author: rpilz{at}ucsd.edu
Vasodilator-stimulated phosphoprotein (VASP) associates with cytoskeletal structures and promotes F-actin formation. RhoA, a member of the Ras superfamily of proteins, activates serum response element (SRE)-dependent transcription through changes in actin dynamics. We now show that the F-actin binding region of VASP is required for VASP stimulation of SRE-dependent transcription, and that VASP is downstream of RhoA in stimulating SRE-dependent transcription. The isolated carboxyl-terminal coiled-coil region of VASP mediates protein tetramerization and has been used as a dominant negative form of VASP; we found that it forms complexes with endogenous VASP in vivo and inhibits in a dose-dependent fashion serum-, RhoA- and VASP-stimulated SRE-dependent transcription. Cyclic GMP-dependent protein kinase (G-kinase) inhibits RhoA activation of SRE-dependent transcription (J.Biol.Chem.277:37382-93,2002). We now show that the G-kinase inhibition that occurs downstream of RhoA can be explained, at least in part, by G-kinase phosphorylation of VASP on Ser239 at the carboxyl-terminal end of the G-actin binding site, with some contribution by phosphorylation of Ser157, which is proximal to the profilin binding site. A phosphorylation-deficient VASP mutant can partly prevent cGMP/G-kinase inhibition of serum- and RhoA-induced SRE-dependent transcription. These studies show that VASP, an important component of the cellular microfilament system, plays a major role in regulating SRE-dependent transcription, and that G-kinase regulates VASP activity.
J. Biol. Chem, 10.1074/jbc.M313048200
Submitted on December 1, 2003
Revised on December 16, 2003
Accepted on December 16, 2003
VASP activation of SRE-dependent transcription occurs downstream of RhoA and is inhibited by cGMP-dependent protein kinase phosphorylation
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