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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Physiology

Background:

  • Voltage-sensing phosphatases (VSPs) are key regulators of phosphoinositide (PIP) signaling pathways.
  • VSPs link membrane potential changes to enzymatic activity through their voltage sensor domain (VSD) and phosphatase domain (PD).
  • The precise mechanism coupling voltage sensing to catalysis in VSPs remains largely unknown.

Purpose of the Study:

  • To elucidate the molecular mechanism by which membrane depolarization activates VSP enzymatic activity.
  • To identify and characterize the structural rearrangements involved in voltage-dependent VSP activation.
  • To investigate the role of the N-terminal domain in VSP function and voltage sensing.

Main Methods:

  • Utilized voltage clamp fluorometry to monitor voltage-induced conformational changes in VSPs.
  • Performed site-directed mutagenesis, focusing on the N-terminal domain and other key VSP regions.
  • Integrated structural analysis and computational modeling to interpret experimental findings.

Main Results:

  • Voltage clamp fluorometry identified voltage-driven rearrangements in the VSD-PD linker, gating loop, R loop, and the previously unexplored N-terminal domain.
  • Mutations in the N-terminus significantly altered conformational rearrangements in other VSP segments.
  • N-terminus mutations also impaired VSP enzymatic activity, demonstrating its crucial role in voltage-dependent regulation.

Conclusions:

  • Proposed a model for VSP activation involving a dynamic assembly where the S4 segment of the VSD controls the catalytic site.
  • The N-terminal domain plays a critical role in mediating voltage-induced conformational changes and enzyme activation.
  • These findings provide new insights into the structure-function relationship of VSPs and their role in cellular signaling.