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Sankalp Shukla1, Rui Jin1, Jaclyn Robustelli1

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Phosphatidylinositol-4,5-bisphosphate (PIP2) desorption from biomimetic membranes causes asymmetric membrane curvature. This process, influenced by lipid tail composition, impacts cellular signaling by forming curved structures.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Membrane Biophysics

Background:

  • Phosphatidylinositol-4,5-bisphosphate (PIP2) is a vital signaling lipid in eukaryotic cell membranes, crucial for various cellular functions.
  • Its highly negative charge and high critical micellar concentration distinguish PIP2 from other phospholipids.
  • Understanding PIP2's localization, protein interactions, and membrane-shaping capabilities is essential.

Purpose of the Study:

  • To investigate the mechanical consequences of PIP2 incorporation into biomimetic membranes.
  • To elucidate the mechanism and asymmetry of PIP2 desorption from giant unilamellar vesicles (GUVs).
  • To quantify the effect of PIP2 desorption on spontaneous membrane curvature.

Main Methods:

  • Utilized fluorescent markers to monitor PIP2 desorption from GUVs over time.
  • Assessed membrane curvature changes by diluting vesicle solutions and observing tubulation.
  • Employed saturated chain PIP2 homologs and membrane tether pulling force measurements.

Main Results:

  • Observed a decrease in fluorescence intensity indicating PIP2 desorption from the outer leaflet of GUVs.
  • Dilution induced rapid internal tubulation, demonstrating asymmetric PIP2 desorption and membrane curvature generation.
  • Identified arachidonic lipid tails as facilitating fast PIP2 desorption, potentially via oxidation.
  • Quantified the impact of asymmetric desorption on spontaneous membrane curvature.

Conclusions:

  • Asymmetric PIP2 desorption from biomimetic membranes generates spontaneous membrane curvature.
  • The presence of arachidonic acid in PIP2 tails accelerates desorption, likely through oxidation.
  • PIP2-induced spontaneous curvature may initiate signaling events by promoting the formation of highly curved membrane structures.