The Thomistic Institute The Plasma Membrane: Boundary and Bridge at the Edge of Life – Prof. Keith Kozminski
Oct 14, 2025
Keith Kozminski, Associate Professor of Biology at the University of Virginia, dives deep into the fascinating world of the plasma membrane. He discusses its role as a boundary and bridge for cellular functions, touching on selective permeability and the structural importance of proteins and lipids. Kozminski explores advanced models of membrane dynamics, highlighting discoveries from super-resolution microscopy that challenge conventional views. His insights connect basic biology with synthetic methodologies, emphasizing the membrane's complexity and crucial functions in living systems.
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Protein Structures Impose Specificity
- Proteins provide transport and communication functions while lipids establish compartmentalization and insulation in membranes.
- Kozminski shows a potassium channel as a structural pipe that enforces ion specificity by shape.
Stained-Glass Ion Channel Story
- Kozminski shares a whimsical example: a stained-glass window of an ion channel made by a retired researcher at Harvard.
- He suggests such imagery could liven up Newman Center windows with scientific motifs like potassium channels.
Lipids Self-Assemble Into Bilayers
- Phospholipids are amphipathic molecules with hydrophilic heads and hydrophobic tails that self-assemble into bilayers to minimize unfavorable water contact.
- That thermodynamic drive explains the lipid bilayer architecture of membranes.