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Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
Published on: March 14, 2021
Detecting cross talk between two halves of a phospholipid bilayer
Jianbing Zhang1, Bingwen Jing, Vaclav Janout
1Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 17, 2007
Summary
Biological membranes exhibit "cross talk" between their leaflets. Perturbing one leaflet alters the other, with energy costs of ~100 cal/mol, suggesting this occurs in cell membranes.
Area of Science:
- Membrane Biophysics
- Biochemistry
- Cell Biology
Background:
- Biological membranes, essential for cellular function, consist of phospholipid bilayers.
- A key question is whether the two leaflets (halves) of a bilayer communicate.
Purpose of the Study:
- To investigate the phenomenon of communication or
- cross talk
- between the leaflets of a fluid phospholipid bilayer.
- To quantify the energy associated with this inter-leaflet interaction.
Main Methods:
- Utilizing a fluid phospholipid bilayer model system.
- Introducing an external agent to perturb the lateral organization of one leaflet.
- Observing and measuring the effects on the adjoining leaflet's organization.
Main Results:
- Perturbation of one leaflet's lateral organization demonstrably alters the organization of the adjacent leaflet.
- The energy required for this observed "cross talk" was quantified at approximately 100 cal/mol of phospholipid.
- This indicates a direct energetic link between leaflet structures.
Conclusions:
- Evidence supports the existence of functional
- cross talk
- between phospholipid bilayer leaflets.
- The findings suggest that changes in one leaflet can directly impact the other.
- This inter-leaflet communication mechanism is likely relevant for the function of biological cell membranes.
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