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The coiled-coil domain of zebrafish TRPM7 regulates Mg·nucleotide sensitivity

Chad Jansen1,2, Jaya Sahni3, Sayuri Suzuki1

  • 1Center for Biomedical Research, The Queen's Medical Center and University of Hawaii, Honolulu, HI-96813, USA.

Scientific Reports
|September 16, 2016
PubMed

Insights

Zebrafish TRPM7 (drTRPM7) ion channel shares biophysical traits with mammals but differs in drug response. Its coiled-coil domain regulates magnesium and ATP binding, offering new research avenues.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Ion Channel Physiology

Background:

  • TRPM7, a fusion protein with ion channel and kinase activity, is crucial in diseases like cancer and cardiovascular conditions.
  • Mammalian TRPM7 studies are limited by embryonic lethality, necessitating alternative models.
  • Zebrafish TRPM7 (drTRPM7) offers a non-lethal model for studying TRPM7 function and regulation.

Purpose of the Study:

  • To investigate the biophysical properties and regulation of wild-type and mutant drTRPM7.
  • To compare drTRPM7's pharmacological profile with mammalian TRPM7.
  • To identify domains involved in drTRPM7 regulation by magnesium and nucleotides.

Main Methods:

  • Electrophysiological characterization of wild-type and C-terminal truncation mutants of drTRPM7.
  • Pharmacological profiling using 2-APB and waixenicin A.
  • Analysis of domain-specific regulation by magnesium (Mg) and Mg·adenosine triphosphate (Mg·ATP).

Main Results:

  • drTRPM7 exhibits biophysical properties similar to mammalian TRPM7.
  • drTRPM7 is facilitated by 2-APB and unaffected by waixenicin A, unlike mammalian TRPM7.
  • The coiled-coil domain of drTRPM7 is critical for regulation by Mg and Mg·ATP.

Conclusions:

  • Zebrafish TRPM7 serves as a valuable model for studying TRPM7 channel function and regulation.
  • drTRPM7 possesses distinct regulatory mechanisms involving its coiled-coil domain for Mg and nucleotide sensing.
  • Findings provide insights into TRPM7's role in physiological processes and disease.

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