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Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors

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Hydrostatic Pressure Sensing by WNK kinases.

John M Humphreys¹, Liliana R Teixeira¹, Radha Akella¹

¹Department of Biophysics, The University of Texas Southwestern Medical Center, Dallas, TX 75390.

Molecular Biology of the Cell

|August 16, 2023

Summary

This summary is machine-generated.

Hydrostatic pressure alters the structure of WNK3 (With No Lysine kinase 3) from a dimer to a monomer, impacting its activity. This reveals a new mechanism for how WNK kinases sense and respond to physical forces.

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Area of Science:

Biochemistry
Cell Biology
Biophysics

Background:

WNK kinases (With No Lysine kinases) are established osmosensors involved in cell-volume regulation.
WNK kinases may also be sensitive to hydrostatic pressure, a physical cellular stressor.

Purpose of the Study:

To investigate the effect of hydrostatic pressure on WNK3 kinase structure and activity.
To explore the potential mechanisms linking hydrostatic pressure activation to WNK osmosensing.

Main Methods:

In vitro studies using purified WNK3 kinase domain (uWNK3).
Application of hydrostatic pressure (190 kPa) using N2 gas.
Structural analysis using Size Exclusion Chromatography-Multi-Angle Light Scattering (SEC-MALS), SEC, Analytical Ultracentrifugation (AUC), NMR, and chemical crosslinking.

Main Results:

Hydrostatic pressure alters the oligomeric structure of uWNK3 from a dimer to a monomer.
Pressure-induced structural changes are comparable to those induced by osmolytes.
Autophosphorylation and activity of uWNK3 are enhanced by hydrostatic pressure, though to a lesser extent than observed in cellular contexts.

Conclusions:

Hydrostatic pressure directly affects WNK3 structure and function.
Structural transition from dimer to monomer is a key mechanism for pressure sensing by WNK3.
Findings suggest a novel pathway for WNK kinases to respond to physical environmental cues, complementing their role in osmosensing.