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Structure, function and subcellular localization of a human platelet Ca2+-ATPase.

W L Dean1

  • 1Department of Biochemistry, University of Louisville, Kentucky.

Cell Calcium
|July 1, 1989
PubMed
Summary
This summary is machine-generated.

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Human platelets possess a calcium pump (Ca2+-ATPase) vital for calcium balance. This pump shares similarities with sarcoplasmic reticulum pumps but is larger and may represent a distinct class of internal membrane calcium pumps.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Human platelets maintain intracellular calcium homeostasis via a Ca2+-ATPase.
  • This platelet Ca2+-ATPase exhibits enzymatic similarities to sarcoplasmic reticulum (SR) Ca2+ pumps.

Purpose of the Study:

  • To investigate the characteristics and potential classification of the human platelet Ca2+-ATPase.
  • To compare the platelet Ca2+-ATPase with known SR Ca2+ pumps.

Main Methods:

  • Immunological cross-reactivity studies using antibodies against SR Ca2+ pumps.
  • Analysis of protein size and messenger RNA (mRNA) coding for the platelet Ca2+-ATPase.
  • Investigation of the localization of the platelet Ca2+-pump within internal membrane structures.

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Main Results:

  • The platelet Ca2+-ATPase is antigenically related to SR Ca2+ pumps.
  • The platelet Ca2+-ATPase is approximately 10 kD larger than SR pumps.
  • A larger mRNA transcript for the platelet Ca2+-ATPase was observed in a megakaryocyte tumor cell line.
  • The platelet Ca2+-pump may reside in specialized internal membranes involved in calcium transport.

Conclusions:

  • The human platelet Ca2+-ATPase shares functional and immunological similarities with SR Ca2+ pumps.
  • Differences in size, mRNA, and potential localization suggest the platelet Ca2+-ATPase may constitute a novel class of internal membrane Ca2+-pumps.