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Related Experiment Videos

Plasma membrane calcium pump: structure, function and relationships

E Carafoli1

  • 1Laboratory of Biochemistry III, Swiss Federal Institute of Technology (ETH), Zürich, Switzerland.

Basic Research in Cardiology
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

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The plasma membrane calcium pump is regulated by calmodulin and other factors. Protease cleavage reveals its autoinhibitory calmodulin-binding domain, influencing pump activity and isoforms.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Physiology

Background:

  • The plasma membrane calcium pump (PMCA) regulates intracellular calcium levels.
  • PMCA activity is modulated by calmodulin and various post-translational modifications.
  • Alternative mRNA splicing generates diverse PMCA isoforms with distinct regulatory properties.

Purpose of the Study:

  • To investigate the autoinhibitory role of the calmodulin-binding domain in PMCA regulation.
  • To elucidate the interaction sites of the calmodulin-binding domain with other pump regions.
  • To understand how PMCA isoforms exhibit variations in regulatory domains and calmodulin sensitivity.

Main Methods:

  • Proteolytic cleavage of PMCA to generate fragments.
  • Biochemical assays to study protein-protein interactions and enzyme activity.

Related Experiment Videos

  • Analysis of PMCA isoforms generated by alternative mRNA splicing.

    • Main Results:

    • Calmodulin-activated protease calpain removes the calmodulin-binding domain, suggesting autoinhibition.
    • The calmodulin-binding domain interacts with regions near the active site and the N-terminal domain.
    • Alternative splicing can alter regulatory domains, affecting calmodulin binding and introducing pH sensitivity.

    Conclusions:

    • The calmodulin-binding domain plays a crucial autoinhibitory role in PMCA function.
    • Structural interactions and alternative splicing contribute to the diverse regulation of PMCA activity.
    • Understanding PMCA regulation is vital for cellular calcium homeostasis.