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Calmodulin interaction with mesocaine-modified lipid bilayer.

I Dovinová1, T Hianik

  • 1Department of Biophysics, Faculty of Mathematics and Physics, Comenius University, Bratislava, Czechoslovakia.

General Physiology and Biophysics
|April 1, 1990
PubMed
Summary

Calmodulin (CaM) weakly affects lipid membrane ordering. CaM influences the polar membrane region, impacting inhibitor incorporation, but shows minimal effect on the hydrophobic core.

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Area of Science:

  • Biophysics
  • Membrane Biology
  • Biochemistry

Background:

  • Calmodulin (CaM) is a crucial calcium-binding protein involved in numerous cellular processes.
  • Lipid bilayers form the fundamental structure of cell membranes, regulating transport and signaling.
  • Understanding protein-membrane interactions is key to deciphering cellular function.

Purpose of the Study:

  • To investigate the effects of Calmodulin (CaM) on the physical properties of bilayer lipid membranes (BLM).
  • To determine how CaM influences membrane elasticity and potential.
  • To elucidate CaM's role in the interaction with membrane components and inhibitors.

Main Methods:

  • Measurement of the modulus of elasticity perpendicular to the membrane plane (E perpendicular).
  • Intramembrane potential (delta psi) measurements.
  • Studies conducted on egg phosphatidylcholine and asolectin BLM, with and without mesocaine (Mes), a CaM inhibitor.

Main Results:

  • CaM interaction caused a slight increase (≤10%) in E perpendicular, indicating minimal impact on the hydrophobic core's ordering.
  • CaM influenced the incorporation of mesocaine (Mes) into the membrane.
  • These findings suggest CaM primarily affects the ordering of the polar, superficial membrane regions.

Conclusions:

  • Calmodulin exhibits a weak influence on the overall ordering of lipid bilayers.
  • CaM's primary interaction site appears to be the polar head groups of the membrane.
  • CaM modulates the membrane environment, affecting the partitioning of specific molecules like inhibitors.

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