Phosphatidylinositol 4,5-bisphosphate specifically stimulates pp60(c-src) catalyzed phosphorylation of gelsolin and related actin-binding proteins

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Abstract

Gelsolin is a widely distributed Ca2+-dependent regulator of the cortical actin network. We demonstrate that gelsolin is phosphorylated by pp60(c-src) and that this phosphorylation is dramatically enhanced by phosphatidylinositol 4,5-bisphosphate (PIP2), known to specifically interact with gelsolin. Other phospholipids display only a marginal effect. pp56(lck), a tyrosine kinase of the same family, does not phosphorylate gelsolin. Other mammalian actin-binding proteins such as profilin and CapG but also fragmin from Physarum polycephalum are similar targets for PIP2-stimulated pp60(c-src) phosphorylation.

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De Corte, V., Gettemans, J., & Vandekerckhove, J. (1997). Phosphatidylinositol 4,5-bisphosphate specifically stimulates pp60(c-src) catalyzed phosphorylation of gelsolin and related actin-binding proteins. FEBS Letters, 401(2–3), 191–196. https://doi.org/10.1016/S0014-5793(96)01471-8

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