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Voltage-sensing phosphatase modulation by a C2 domain.

Paul M Castle1, Kevin D Zolman1, Susy C Kohout1

  • 1Department of Cell Biology and Neuroscience, Montana State University Bozeman, MT, USA.

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|April 24, 2015
PubMed
Summary
This summary is machine-generated.

The voltage-sensing phosphatase (VSP) C2 domain is essential for enzyme catalysis and activity modulation. While not exclusively binding phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2), its membrane interaction influences VSP function.

Keywords:
C2 domainPH domainsPIPmembrane potentialvoltage clamp fluorometryvoltage-sensing phosphatase

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Membrane Biophysics

Background:

  • The voltage-sensing phosphatase (VSP) is a unique enzyme regulated by membrane potential.
  • VSP comprises a voltage-sensing domain (VSD), linker, catalytic domain, and C2 domain.
  • The C2 domain's function in VSP remains largely uncharacterized.

Purpose of the Study:

  • To investigate the roles of the VSP C2 domain in catalysis and membrane binding.
  • To elucidate the C2 domain's contribution to VSP activity and voltage dependence.

Main Methods:

  • Site-directed mutagenesis of key C2 residues (e.g., Y522).
  • Deletion of the entire C2 domain.
  • Voltage clamp fluorometry (VCF) to measure VSD motion.
  • Manipulation of membrane phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) levels.

Main Results:

  • Mutation of Y522 altered VSP's voltage dependence, suggesting a catalytic role via hydrogen bonding.
  • C2 domain deletion abolished detectable voltage-dependent activity, confirming its necessity for catalysis and modulation.
  • Neutralizing positive charges in the C2 domain shifted voltage dependence, indicating membrane interaction.
  • VSD motion remained unchanged upon PI(4,5)P2 depletion, suggesting C2 membrane interaction is not exclusively PI(4,5)P2-dependent.

Conclusions:

  • The VSP C2 domain is indispensable for both catalytic activity and modulation of VSP function.
  • The C2 domain participates in membrane interactions that influence VSP activity, potentially through mechanisms beyond PI(4,5)P2 binding.
  • This study clarifies the critical role of the C2 domain in VSP's voltage-sensing and enzymatic properties.