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Related Experiment Videos

Anionic phospholipids decrease the rate of slippage on the Ca(2+)-ATPase of sarcoplasmic reticulum.

K A Dalton1, J D Pilot, S Mall

  • 1Division of Biochemistry and Molecular Biology, School of Biological Sciences, University of Southampton, Southampton, SO167PX, U.K.

The Biochemical Journal
|August 24, 1999
PubMed
Summary

Anionic phospholipids enhance calcium (Ca2+) accumulation by skeletal muscle sarcoplasmic reticulum Ca2+-ATPase in reconstituted vesicles. These lipids decrease ATPase slippage, improving Ca2+ transport efficiency.

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Area of Science:

  • Biochemistry
  • Membrane Biophysics
  • Sarcoplasmic Reticulum Function

Background:

  • Skeletal muscle sarcoplasmic reticulum Ca2+-ATPase (SERCA) is crucial for muscle relaxation by sequestering Ca2+.
  • Lipid composition significantly influences membrane protein function, including Ca2+-ATPase activity.
  • Understanding Ca2+ transport requires investigating factors affecting SERCA efficiency.

Purpose of the Study:

  • To investigate the impact of lipid composition on Ca2+ accumulation by skeletal muscle sarcoplasmic reticulum Ca2+-ATPase.
  • To determine the role of anionic phospholipids in modulating Ca2+ transport efficiency.
  • To elucidate the mechanism underlying Ca2+ leak or loss during SERCA activity.

Main Methods:

  • Reconstitution of purified Ca2+-ATPase into sealed vesicles with varying lipid compositions.

Related Experiment Videos

  • Measurement of Ca2+ accumulation using techniques to control for ion gradients and electrical potential.
  • Kinetic modeling to differentiate between passive Ca2+ leak and ATPase slippage.

    • Main Results:

    • Dioleyolphosphatidylcholine (DOPC) alone resulted in low Ca2+ accumulation despite supporting high ATPase activity.
    • Inclusion of 10 mol% anionic phospholipids (e.g., DOPA, DOPS) significantly increased Ca2+ accumulation, with cardiolipin and phosphatidylinositol 4-phosphate being most effective.
    • Experimental data best fitted a slippage model, indicating that anionic phospholipids reduce the rate of Ca2+ slippage on the ATPase.

    Conclusions:

    • Anionic phospholipids are essential for efficient Ca2+ accumulation by skeletal muscle sarcoplasmic reticulum Ca2+-ATPase.
    • The primary mechanism limiting Ca2+ accumulation is ATPase slippage, which is suppressed by anionic lipids.
    • Optimizing lipid composition, particularly incorporating anionic phospholipids, can enhance SERCA function for improved Ca2+ handling.