Filming protein fibrillogenesis in real time

Area of Science:

• Biophysics
• Materials Science
• Nanotechnology

Background:

• Protein fibrillogenesis is crucial for biological functions and offers significant potential in nanoscience.
• Direct observation and kinetic understanding of homogeneous fiber growth for nanostructure engineering are currently lacking.

Purpose of the Study:

• To introduce and validate a kinetic model for de novo protein fibrillogenesis.
• To enable real-time, nanoscale observation of homogeneous protein fiber growth.
• To provide a foundation for in situ engineering of fibrous nanostructures.

Main Methods:

• Development of a novel kinetic model for protein fibrillogenesis.
• Real-time nanoscale imaging of the fibrillogenesis process.
• Analysis of fiber growth dynamics.

Main Results:

• Homogeneous protein recruitment exhibits uniform rates of cooperative growth at both fiber ends (bi-directional growth).
• Lateral growth is arrested post-seeding in homogeneous assemblies.
• Contrast with heterogeneous amyloid assemblies was observed.

Conclusions:

• The developed kinetic model facilitates real-time observation and understanding of protein fibrillogenesis.
• Bi-directional growth with arrested lateral growth characterizes homogeneous protein fiber formation.
• This work lays the groundwork for in situ engineering of sequence-prescribed fibrous architectures.