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The plasma membrane is an essential cellular structure responsible for maintaining cellular integrity and regulating the selective transport of molecules. While bacteria and archaea share the fundamental function of plasma membranes, their structural and molecular differences reflect adaptations to distinct ecological and physiological challenges.Bacterial Plasma MembranesBacterial plasma membranes are predominantly composed of phospholipids with fatty acid chains ester-linked to a glycerol...
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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
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Physical Plasma Membrane Perturbation Using Subcellular Optogenetics Drives Integrin-Activated Cell Migration.

Xenia Meshik, Patrick R O'Neill, N Gautam

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    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a new optogenetic method to control cell migration by physically deforming the plasma membrane. This technique unexpectedly induced directional cell movement by altering membrane tension and activating integrins.

    Keywords:
    amoeboid migrationintegrinmechanotransductionmembrane tensionoptogenetics

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Molecular Biology

    Background:

    • Physical forces acting on the plasma membrane significantly influence cellular behaviors, including migration.
    • Current methods for studying these mechanobiological responses lack precise spatial and temporal control over membrane perturbations.

    Purpose of the Study:

    • To develop a novel optogenetic tool for rapid, reversible, and subcellular control of plasma membrane physical properties.
    • To investigate the molecular mechanisms by which physical membrane deformations drive cell migration.

    Main Methods:

    • Utilized light-inducible dimerization to recruit cytosolic proteins to specific plasma membrane sites, altering local membrane properties.
    • Employed optogenetics to induce localized changes in membrane curvature and tension.
    • Simultaneously imaged molecular events and cellular responses, including integrin activity and cytoskeletal dynamics.

    Main Results:

    • Polarized accumulation of recruited proteins induced directional amoeboid cell migration.
    • Observed localized decrease in plasma membrane tension and increased curvature at the protein accumulation site.
    • Demonstrated optogenetically controlled activation of integrins, linked to a positive feedback loop involving SFK, ERK, RhoA, and actomyosin contractility.

    Conclusions:

    • Optogenetic manipulation of plasma membrane mechanics provides a powerful tool to study cell migration.
    • A feedback mechanism involving RhoA activation, actomyosin contractility, and membrane tension dynamics underlies optogenetically induced cell migration.
    • This approach reveals new insights into the mechanobiology of cell movement.