Assemblies of pore-forming toxins visualized by atomic force microscopy.

Area of Science:

• Biophysics
• Molecular Biology
• Biochemistry

Background:

• Pore-forming toxins (PFTs) interact with lipid membranes to assemble into functional structures.
• Understanding PFT assembly is crucial for deciphering their biological roles and developing interventions.
• Traditional imaging techniques like electron microscopy (EM) have limitations in visualizing dynamic processes.

Purpose of the Study:

• To review the application and contributions of Atomic Force Microscopy (AFM) in studying PFTs.
• To highlight AFM's capability in visualizing PFT assembly dynamics and membrane interactions.
• To summarize AFM's role in understanding toxin-induced membrane reorganization.

Main Methods:

• Utilizing Atomic Force Microscopy (AFM) for high-resolution imaging of PFTs on lipid bilayers.
• Performing AFM under physiological conditions to capture dynamic assembly processes.
• Analyzing AFM data to characterize PFT oligomeric states and membrane structural changes.

Main Results:

• AFM enables real-time visualization of PFT assembly, from initial binding to pore formation.
• AFM can distinguish between the prepore and pore states of PFTs.
• AFM reveals toxin-induced alterations in lipid membrane organization and integrity.

Conclusions:

• AFM is a powerful tool for studying the mechanisms of PFT assembly and function.
• AFM provides unique insights into the dynamic interactions between toxins and cell membranes.
• This review underscores the significance of AFM in advancing PFT research and membrane biology.