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Related Experiment Videos

The Na+/H+ exchanger cytoplasmic tail: structure, function, and interactions with tescalcin.

Xiuju Li1, Yongsheng Liu, Cyril M Kay

  • 1Department of Biochemistry, Faculty of Medicine, CIHR Membrane Protein Research Group, University of Alberta, 347 Medical Science Building, Edmonton, Alberta, Canada T6G 2H7.

Biochemistry
|June 18, 2003
PubMed
Summary
This summary is machine-generated.

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The Na(+)/H(+) exchanger

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Physiology

Background:

  • The Na(+)/H(+) exchanger regulates intracellular pH.
  • Its cytoplasmic tail is crucial for this regulation.
  • Tescalcin and calmodulin are known binding proteins.

Purpose of the Study:

  • To characterize the regulatory cytoplasmic tail of the Na(+)/H(+) exchanger.
  • To investigate the effects of pH, calcium, and tescalcin on its conformation and binding.

Main Methods:

  • Used a histidine-tagged C-terminal protein fragment (His182).
  • Employeed Cascade Blue fluorescence labeling.
  • Performed CD spectroscopy and sedimentation equilibrium analysis.

Main Results:

Related Experiment Videos

  • His182 bound tescalcin and calmodulin.
  • Calcium and pH changes altered His182 fluorescence and conformation.
  • Tescalcin binding decreased fluorescence; calcium reversed this.
  • Tescalcin inhibited exchanger activity in vivo.
  • Calcium increased beta-structure in His182.

Conclusions:

  • The Na(+)/H(+) exchanger C-terminus is a monomeric protein.
  • It binds tescalcin and undergoes conformational changes.
  • These changes, influenced by pH and calcium, likely modulate exchanger activity.