An Optimized Protocol for High-Quality AFM Imaging of Amyloid Fibrils

Area of Science:

• Biophysics
• Nanotechnology
• Neuroscience

Background:

• Amyloid protein morphology characterization is crucial for understanding neurodegenerative diseases.
• Atomic force microscopy (AFM) offers high-resolution imaging of amyloid fibrils.
• Conventional sample preparation for AFM can introduce artifacts, especially salt aggregation.

Purpose of the Study:

• To present an optimized protocol for coating amyloid proteins onto mica for AFM imaging.
• To minimize artifacts caused by salt deposition during sample preparation.
• To improve protein adherence and reduce background noise in AFM images.

Main Methods:

• Developed a dip-washing technique for coating amyloid proteins onto mica substrates.
• Implemented stepwise washing instructions to balance salt removal and protein retention.
• Utilized AFM for high-resolution imaging of prepared amyloid protein samples.

Main Results:

• The dip-washing method effectively removes excess salt from the mica surface.
• Improved adherence of amyloid proteins to the mica substrate was observed.
• Minimized imaging artifacts, leading to clearer AFM visualization of protein fibrils.

Conclusions:

• The optimized protocol enhances the quality of AFM imaging for amyloid proteins.
• This method facilitates the study of amyloid fibrillation mechanisms and dynamics.
• The protocol is valuable for both biological/medical research and nanotechnological applications.