A method for tethering single viral particles for virus-cell interaction studies with optical tweezers

Area of Science:

• Biophysics
• Virology
• Molecular Biology

Background:

• Direct optical trapping enables single-molecule sensitivity for characterizing viral particles.
• Studying virus-cell interactions, like human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein (Env) binding to receptors, is crucial for understanding viral entry.
• Current methods lack the resolution to detail Env binding dynamics and stoichiometry during cell entry.

Purpose of the Study:

• To develop an optical tweezers technique for delivering single HIV-1 virions to live cells with minimal perturbation.
• To quantitatively probe the physical interactions between Env and cellular receptors in their native cellular environment.
• To investigate protein-protein interactions in live cells, including receptor activation.

Main Methods:

• Development of a novel optical tweezers technique for precise manipulation of single viral particles.
• Application of the technique to deliver a single HIV-1 virion to a live cell.
• Quantitative analysis of physical interactions between viral Env proteins and cellular receptors.

Main Results:

• The developed optical tweezers method allows for the precise delivery of single HIV-1 virions to live cells.
• The technique enables quantitative probing of Env-receptor interactions in a native cellular context.
• Potential to reveal critical parameters governing HIV-1 entry dynamics and stoichiometry.

Conclusions:

• The optical tweezers method provides a powerful tool to study the dynamics and stoichiometry of Env binding to cellular receptors.
• This technique can elucidate fundamental aspects of HIV-1 entry and other protein-mediated cellular recognition processes.
• Offers a new avenue for understanding virus-cell interactions at the single-particle level.