Abstract
CoA Synthase (CoASy, 4′-phosphopantetheine adenylyltransferase/dephospho-CoA kinase) mediates two final stages of de novo coenzyme A (CoA) biosynthesis in higher eukaryotes. Unfortunately very little is known about regulation of this important metabolic pathway. In this study, we demonstrate that CoASy interacts in vitro with Src homology-2 (SH2) domains of a number of signaling proteins, including Src homology-2 domains containing protein tyrosine phosphatase (Shp2PTP). Complexes between CoASy and Shp2PTP exist in vivo in mammalian cells and this interaction is regulated in a growth-factor-dependent manner. We have also demonstrated that endogenous CoASy is phosphorylated on tyrosine residues in vivo, and that cytoplasmic protein tyrosine kinases can mediate this phosphorylation in vitro and in vivo. Importantly, Shp2PTP-mediated CoASy in vitro dephosphorylation leads to an increase in CoASy enzymatic phosphopantetheine adenylyltransferase (PPAT) activity. We therefore argue that CoASy is a novel potential substrate of Shp2PTP and phosphorylation of CoASy at tyrosine residue(s) could represent unrecognized before mechanism of modulation intracellular CoA level in response to hormonal and (or) other extracellular stimuli.
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Acknowledgments
Ivan Nemazanyy was supported by Wood-Whelan Research Fellowship, Oksana Breus was supported by EMBO Short-term fellowship. We thank Dr. Zamal Ahmed for providing us with Shp2PTP–GST recombinant protein and Nadeem Shaikh for critical reading of the manuscript and helpful suggestions.
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Oksana Breus and Ganna Panasyuk contributed equally to this article.
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Breus, O., Panasyuk, G., Gout, I.T. et al. CoA Synthase is phosphorylated on tyrosines in mammalian cells, interacts with and is dephosphorylated by Shp2PTP. Mol Cell Biochem 335, 195–202 (2010). https://doi.org/10.1007/s11010-009-0255-6
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DOI: https://doi.org/10.1007/s11010-009-0255-6