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Microcalorimetric study on the phase behaviour of S-layer coated liposomes
1Zentrum für Ultrastrukturforschung, Universität für Bodenkultur Wien, Vienna, Austria.
Molecular Membrane Biology
|September 2, 1998
Summary
Bacillus coagulans S-layer proteins recrystallized on liposomes alter lipid phase behavior. Covalent cross-linking induced lipid phase separation, suggesting altered phospholipid mobility in these S-layer coated liposomes.
Area of Science:
- Biophysics
- Materials Science
- Microbiology
Background:
- Recrystallization of isolated S-layer proteins onto liposomes is a key technique for creating novel biomaterials.
- Understanding the interaction between microbial surface layers and lipid membranes is crucial for various applications.
Purpose of the Study:
- To investigate the thermotropic phase behavior of liposomes coated with Bacillus coagulans S-layer subunits.
- To examine the effect of covalent cross-linking of S-layer proteins to liposomes on their phase separation.
Main Methods:
- Recrystallization of Bacillus coagulans S-layer subunits onto unilamellar liposomes.
- Differential scanning microcalorimetry to characterize thermotropic phase behavior.
- Covalent cross-linking using glutaraldehyde.
Main Results:
- S-layer coated liposomes exhibited a broad phase transition around 50°C, similar to uncoated liposomes.
- S-layer coated liposomes showed a slightly higher phase transition temperature, attributed to increased intermolecular order.
- Covalent cross-linking induced phase separation within the liposomes, indicating distinct lipid domains with varying mobility.
Conclusions:
- Bacillus coagulans S-layer proteins influence liposome thermotropic behavior.
- Covalent immobilization of S-layer proteins can lead to controlled lipid phase separation.
- These findings provide insights into S-layer-lipid interactions and potential for engineered biomembranes.