Discrete long-range on-cell motion of bacteriophage T4

Area of Science:

• Microbiology
• Virology
• Biophysics

Background:

• Bacteriophage-host interactions are vital for phage survival and reproduction.
• Previous studies lacked spatiotemporal resolution, hindering understanding of phage-host recognition dynamics.
• Understanding the initial contact and binding events is key to phage infection cycles.

Purpose of the Study:

• To investigate the nanoscopic, on-cell dynamics of bacteriophage T4 interacting with its host, Escherichia coli B.
• To reveal the spatiotemporal dynamics of phage-bacteria interactions at high resolution.
• To provide direct evidence of phage movement strategies during host encounters.

Main Methods:

• Utilizing single-particle fluorescence microscopy to track fluorescently labeled bacteriophage T4.
• Analyzing the movement of individual phages on or near the surface of Escherichia coli B.
• Employing high spatial and temporal resolution to capture dynamic interactions.

Main Results:

• Demonstrated that bacteriophage T4 exhibits long-range motion on the bacterial cell surface.
• Observed repeated shifts in the mean positions of phage tethering locations, facilitating movement.
• Provided the first direct evidence of such dynamic, long-range motility in bacteriophages.

Conclusions:

• Bacteriophage T4 employs a "walking" motility mechanism on host cell surfaces.
• This long-range movement strategy is critical for efficient host recognition and infection.
• The findings offer new insights into the intricate dynamics of virus-bacteria interactions.