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RhoA allosterically activates phospholipase Cε via its EF hands.

Vaani Ohri1,2, Kadidia Samassekou3,4, Kaushik Muralidharan5

  • 1Department of Biological Sciences, Purdue University, West Lafayette, IN, USA.

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|September 27, 2025
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Summary
This summary is machine-generated.

RhoA GTPase activates Phospholipase Cε (PLCε) via a unique binding site, protecting the cardiovascular system from injury. This interaction enhances PLCε membrane binding and activity, crucial for cardiomyocyte survival.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Phospholipase Cε (PLCε) is activated by small GTPases, playing a role in cellular signaling.
  • RhoA GTPase is known to regulate PLCε in the cardiovascular system, offering protection against ischemia/reperfusion injuries.
  • The precise molecular mechanism of RhoA regulation of PLCε remains unknown.

Purpose of the Study:

  • To elucidate the molecular mechanism by which RhoA GTPase activates PLCε.
  • To characterize the structural basis of RhoA-PLCε interaction.
  • To understand how this interaction contributes to cardioprotection.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) to determine the structure of RhoA bound to PLCε.
  • Site-directed mutagenesis to investigate the role of a specific PLCε insertion.
  • Biochemical assays to assess PLCε activation and membrane binding.

Main Results:

  • The cryo-EM structure revealed that RhoA binds to a unique insertion within the EF hands of PLCε.
  • Deletion or mutation of this insertion abolished RhoA-dependent PLCε activation.
  • This interaction allosterically activates PLCε, increasing its membrane association and lipase activity.

Conclusions:

  • RhoA binding to a specific PLCε insertion is critical for its activation.
  • This interaction enhances PLCε membrane binding and activity, contributing to cardiomyocyte survival.
  • The findings provide a molecular basis for RhoA-mediated cardioprotection via PLCε.