The Journal of Membrane Biology

, Volume 35, Issue 1, pp 125–136 | Cite as

ATPase and phosphatase activities from human red cell membranes: II. The effects of phospholipases on Ca2+-dependent enzymic activities

  • D. E. Richards
  • J. C. Vidal
  • P. J. Garrahan
  • A. F. Rega
Article

Summary

Treatment of human red cell membranes with pure phospholipase A2 results in a progressive inactivation of both Ca2+-dependent and (Ca2++K+)-dependent ATPase and phosphatase activities. When phospholipase C replaces phospholipase A2, Ca2+-dependent ATPase activity and Ca2+-dependent phosphorylation of red cell membranes are lost, while Ca2+-dependent phosphatase activity is enhanced and its apparent affinity for Ca2+ is increased about 20-fold. Activation of Ca2+-dependent phosphatase following phospholipase C treatment was not observed in sarcoplasmic reticulum preparation. Phospholipase C increases the sensitivity of the phosphatase to N-ethylmaleimide but has little effect on the kinetic parameters relating the phosphatase activity to substrate and cofactors, suggesting that no extensive structural disarrangement of the Ca2+-ATPase system has occurred after incubation with phospholipase C.

Keywords

Human Physiology Kinetic Parameter ATPase Activity Phosphatase Activity Sarcoplasmic Reticulum 

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Copyright information

© Springer-Verlag New York Inc. 1977

Authors and Affiliations

  • D. E. Richards
    • 1
  • J. C. Vidal
    • 1
  • P. J. Garrahan
    • 1
  • A. F. Rega
    • 1
  1. 1.Departamento de Química Biológica, Facultad de Farmacia y BioquímicaUniversidad de Buenos AiresBuenos AiresArgentina

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