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. 1991 Jul;60(1):149–159. doi: 10.1016/S0006-3495(91)82038-0

Peptides that mimic the pseudosubstrate region of protein kinase C bind to acidic lipids in membranes.

M Mosior 1, S McLaughlin 1
PMCID: PMC1260046  PMID: 1883933

Abstract

The cytoplasmic form of protein kinase C (PKC) is inactive, probably because the pseudosubstrate region in its regulatory domain blocks the substrate-binding site in its kinase domain. Calcium ions cause a translocation to the membrane: maximum activation requires a negative lipid such as phosphatidylserine (PS) and the neutral lipid diacylglycerol (DAG) but the mechanism by which PS and DAG activate PKC is unknown. Pseudosubstrate region 19-36 of PKC-beta has six basic and one acidic amino acids and region 19-29 has five basic and no acidic amino acids. Since any binding of basic residues in the pseudosubstrate region to acidic lipids in the membrane should stabilize the active form of PKC, we studied how peptides with amino acids equivalent to residues 19-36 and 19-29 of PKC-beta bound to phospholipid vesicles. We made equilibrium dialysis, filtration, and electrophoretic mobility measurements. The fraction of bound peptide is a steep sigmoidal function of the mol fraction of negative lipid in the membrane, as predicted from a simple theoretical model that assumes the basic residues provide identical independent binding sites. The proportionality constant between the number of bound peptides/area and the concentration of peptide in the bulk aqueous phase is 1 micron for a membrane with 25% negative lipid formed in 0.1 M KCl. Equivalently, the association constant of the peptide with the membrane is 10(4) M-1, or the net binding energy is 6 kcal/mol. Thus the interaction of basic residues in the pseudosubstrate region with acidic lipids in the membrane could provide 6 kcal/mol free energy towards stabilizing the active form of PKC.

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Selected References

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