Kinetic analysis of the interaction of the C1 domain of protein kinase C with lipid membranes by stopped-flow spectroscopy

The Journal of Biological Chemistry
Daniel R Dries, A C Newton

Abstract

The diacylglycerol (DG)/phorbol ester-dependent translocation of conventional protein kinase C (PKC) isozymes is mediated by the C1 domain, a membrane-targeting module that also selectively binds phosphatidylserine (PS). Using stopped-flow spectroscopy, we dissect the contribution of DG/phorbol esters (C1 ligand) and PS in driving the association and dissociation of the C1 domain from membranes. Specifically, we examine the binding to membranes of the C1B domain of PKCbeta with a substituted Trp (Y123W) whose fluorescence is quenched upon binding to membranes. Binding of this construct (C1Bbeta-Y123W) to phospholipid vesicles is cooperative with respect to PS content and dependent on C1 ligand, as previously characterized. Stopped-flow analysis reveals that the apparent association rate (k(on)(app)), but not the apparent dissociation rate (k(off)(app)), is highly sensitive to PS content: the 60-fold increase in membrane affinity for vesicles containing no PS compared with 40 mol % PS results primarily from a robust (30-fold) increase in k(on)(app) with little effect (2-fold) on k(off)(app). Membrane affinity is also controlled by the content and structure of the C1 ligand. In contrast to PS, these ligands markedly alter k(off)(...Continue Reading

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Citations

Nov 26, 2009·Nature Chemical Biology·Holger GerlachMatthias Geyer
Jun 2, 2011·Cold Spring Harbor Perspectives in Biology·Peter Lipp, Gregor Reither
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