Surface ultrastructure of SARS coronavirus revealed by atomic force microscopy

Area of Science:

• Virology
• Nanotechnology
• Microscopy

Background:

• Severe acute respiratory syndrome coronavirus (SARS-CoV) is a significant human pathogen.
• Understanding the nanoscale surface structure of viruses is crucial for developing effective antiviral strategies.

Purpose of the Study:

• To directly visualize and characterize the surface nanostructures of SARS-CoV particles.
• To provide quantitative measurements of SARS-CoV structural proteins and spikes.

Main Methods:

• Atomic force microscopy (AFM) was employed to probe SARS-CoV surface nanostructures.
• High-resolution imaging was used to reveal viral ultrastructure.
• Hydroxyoctanoic acid treatment was applied to analyze the viral envelope.

Main Results:

• Single SARS-CoV virions were directly visualized with crown-like morphology.
• The study measured approximately 15 spherical spikes on each SARS-CoV particle.
• Spike diameter was quantified at 7.29 +/- 0.73 nm, consistent with S glycoprotein predictions.

Conclusions:

• This research provides the first direct nanoscale characterization of SARS-CoV surface ultrastructures.
• The findings offer new insights into viral surface properties and spike dimensions.
• This study paves the way for advanced mapping of viral surface characteristics.