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Robert Strutt1,2, James W Hindley1,2,3, Jordan Gregg1

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Summary

Researchers activated a bacterial mechanosensitive channel (MscL) in synthetic minimal tissues by altering lipid composition. This controlled molecular flow, paving the way for dynamic tissue design.

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Area of Science:

  • Synthetic Biology
  • Biophysics
  • Materials Science

Background:

  • Droplet microcompartments and lipid bilayers are key for synthetic minimal tissues.
  • Membrane proteins control molecular flux between compartments, acting as gates.
  • Previous work demonstrated MscL gating using electrical, mechanical, or chemical stimuli.

Purpose of the Study:

  • To investigate MscL channel activation in droplet interface bilayers (DIBs) by manipulating membrane asymmetry.
  • To explore the effect of lipid composition on MscL gating dynamics.
  • To provide insights for designing dynamic minimal tissues.

Main Methods:

  • Utilized dioleoylphosphatidylcholine:dioleoylphosphatidylglycerol DIBs.
  • Incorporated lysophosphatidylcholine (LPC) into one leaflet of the DIB.
  • Employed electrical measurements to monitor MscL channel activity.

Main Results:

  • Lysophosphatidylcholine (LPC) incorporation induced MscL gating in a concentration-dependent manner.
  • Partial MscL activation was observed at 10 mol% LPC.
  • Full MscL activation was achieved at 15 mol% LPC.

Conclusions:

  • Membrane asymmetry, induced by lipid composition, can effectively trigger MscL channel gating.
  • This approach offers a novel method for controlling molecular flux in synthetic tissues.
  • Findings suggest potential for designing minimal tissues with dynamically regulated pathways.