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PRL-1/2 phosphatases control TRPM7 magnesium-dependent function to regulate cellular bioenergetics.

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Phosphatases of regenerating liver (PRL) regulate intracellular magnesium by interacting with CNNM proteins. This study reveals how PRLs and CNNM3 dynamically control the TRPM7 magnesium channel, impacting cellular metabolism.

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Area of Science:

  • Cellular Biology
  • Molecular Mechanisms of Ion Transport
  • Biochemistry

Background:

  • Phosphatases of regenerating liver (PRL-1, PRL-2, PRL-3) are implicated in regulating intracellular magnesium levels.
  • The interaction between PRLs and CNNM magnesium transport regulators is known, but the precise mechanism of magnesium transport remains unclear.

Purpose of the Study:

  • To elucidate the mechanism of magnesium transport regulated by the PRL-CNNM complex.
  • To investigate the role of ARL15 and PRL-2 in modulating CNNM3 and TRPM7 interactions.
  • To understand how PRLs and CNNM3 influence TRPM7 channel activity and cellular metabolism.

Main Methods:

  • Development of a genetically encoded intracellular magnesium-specific reporter.
  • Analysis of protein-protein interactions using co-immunoprecipitation and other biochemical assays.
  • Overexpression and knockdown studies of PRLs, CNNM3, and ARL15 to assess TRPM7 channel function.

Main Results:

  • CNNM family proteins inhibit the TRPM7 magnesium channel.
  • ARL15 promotes CNNM3/TRPM7 complex formation, reducing TRPM7 activity.
  • PRL-2 overexpression disrupts the CNNM3-TRPM7 interaction, enhancing TRPM7 function.
  • PRL-1/2 promote TRPM7-induced signaling, while CNNM3 overexpression inhibits it.
  • Cellular magnesium levels and PRL activity dynamically regulate CNNM3-TRPM7 interaction.
  • Co-targeting TRPM7 and PRL-1/2 affects mitochondrial function and metabolic stress response.

Conclusions:

  • PRL-1/2 dynamically regulate TRPM7 channel activity through interactions with CNNM3.
  • This regulation coordinates magnesium transport and reprograms cellular metabolism, particularly under metabolic stress.
  • Findings provide insights into the molecular mechanisms controlling intracellular magnesium homeostasis.