Characterization of DNA bound cyclic GMP-AMP synthase using atomic force microscopy imaging.

Area of Science:

• Biophysics
• Molecular Biology
• Nanotechnology

Background:

• Atomic Force Microscopy (AFM) is crucial for characterizing biomolecular complexes at the single-molecule level.
• AFM provides high-resolution topographical imaging capabilities essential for structural analysis.
• Understanding DNA-protein interactions is fundamental in molecular biology.

Purpose of the Study:

• To present a detailed protocol for acquiring high-resolution topography images of DNA-protein complexes using AFM.
• To demonstrate the application of AFM for visualizing structural characteristics and variations in individual DNA-protein assemblies.
• To establish a generalizable method for studying diverse DNA-protein interactions, exemplified by cyclic GMP-AMP synthase (cGAS).

Main Methods:

• Atomic Force Microscopy (AFM) imaging technique.
• Sample preparation for DNA-protein complex deposition and imaging.
• Data acquisition and analysis of topographical images.

Main Results:

• Successful acquisition of detailed topography images of DNA-protein complexes.
• Visualization of structural features and heterogeneity within individual complexes.
• Demonstration of AFM's capability to differentiate between molecular structures.

Conclusions:

• The described AFM protocol is effective for high-resolution imaging of DNA-protein complexes.
• This method allows for the characterization of structural attributes and variations in biomolecular assemblies.
• The protocol serves as a valuable tool for advancing the study of DNA-protein interactions, with cGAS as a model system.