Multiparametric Atomic Force Microscopy Imaging of Biomolecular and Cellular Systems

Area of Science:

• Biophysics
• Nanotechnology
• Biochemistry

Background:

• Atomic force microscopy (AFM) has advanced biosystem analysis to the single-molecule level.
• Force-distance (FD) curve-based AFM enables mapping and quantification of biophysical properties and interactions.
• Traditional AFM methods faced limitations in spatial and temporal resolution for dynamic biological studies.

Purpose of the Study:

• To introduce novel multiparametric AFM imaging modalities for high spatiotemporal resolution analysis of biological samples.
• To showcase recent applications of these advanced AFM techniques across various biological systems.
• To highlight new methodologies combining multiparametric imaging with functionalized probes for detailed molecular interaction analysis.

Main Methods:

• Development of novel FD-based multiparametric imaging modalities.
• Utilizing tip oscillation for high-frequency FD curve acquisition.
• Combining multiparametric AFM with functionalized probes (chemical groups, ligands, live cells).

Main Results:

• Simultaneous imaging of structure, elasticity, and interactions at high resolution.
• Observation of mechanical and chemical properties of single proteins.
• Measurement of electrostatic potential of proteins and nanomechanical mapping of cellular events.
• Detailed analysis of receptor-ligand interactions and viral binding events.

Conclusions:

• Multiparametric AFM imaging significantly enhances the study of biomolecular and cellular systems.
• This technology provides unprecedented insights into nanoscale biophysical and chemical properties.
• Future applications are expected to broaden, aiding chemists in understanding complex biological functions.