Abstract

Phosphatidic acid in the form of small unilamellar vesicles has a dissociation constant of about 8.3 as determined by 31P nuclear magnetic resonance (NMR) spectroscopy. The activation of protein kinase C (PKC) by monovalent phosphatidic acid or phosphatidylserine occurs only in the presence of Ca2+. However, PKC activity on membranes of divalent anionic phosphatidic acid is independent of Ca2+ concentration.

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