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In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers

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Published on: July 28, 2018

The SC3 hydrophobin self-assembles into a membrane with distinct mass transfer properties.

X Wang¹, Fuxin Shi, H A B Wösten

¹Biomade Technology Foundation, Groningen, The Netherlands.

Biophysical Journal

|March 8, 2005

Summary

Hydrophobins, like SC3 from Schizophyllum commune, form dynamic membranes at interfaces. These fungal proteins exhibit distinct behaviors at oil-water versus air-water interfaces, impacting emulsification and permeability.

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Area of Science:

Biochemistry
Materials Science
Mycology

Background:

Hydrophobins are fungal proteins known for self-assembly into amphipathic membranes at interfaces.
The SC3 hydrophobin from Schizophyllum commune forms amyloid fibrils called rodlets at air-water interfaces.
Understanding hydrophobin assembly dynamics and membrane properties is crucial for their functional applications.

Purpose of the Study:

To investigate the dynamic assembly of SC3 hydrophobin at oil-water and air-water interfaces.
To characterize the permeability properties of SC3-assembled layers at these interfaces.
To elucidate the mechanism of emulsification and solute transfer mediated by SC3 at oil-water interfaces.

Main Methods:

In situ observation of SC3 hydrophobin assembly dynamics at oil-water and air-water interfaces.
Permeability assays using solutes of varying molecular weights (>200 Da) and hydrophobic markers.
Analysis of SC3 vesicle formation and release during oil-water interfacial assembly.

Main Results:

SC3 assembly at oil-water interfaces creates a dynamic emulsifying system, accepting oligomers and releasing SC3 vesicles containing oil.
The assembled layer at oil-water interfaces is impermeable to solutes >200 Da but facilitates oil transfer into the water phase via vesicles.
SC3 layers at air-water interfaces are permeable to water vapor, demonstrating differential interface-specific properties.

Conclusions:

SC3 hydrophobin exhibits distinct assembly dynamics and permeability characteristics at oil-water versus air-water interfaces.
The emulsification process at oil-water interfaces involves unidirectional solute uptake and vesicle-mediated oil transfer.
SC3-assembled layers present unique properties relevant to biomaterials and interfacial engineering.