Analyzing Phage-Host Protein-Protein Interactions Using Strep-tag^® II Purifications

Area of Science:

• Microbiology
• Molecular Biology
• Virology

Background:

• Bacteriophages (phages) manipulate host cell metabolism for efficient replication.
• Phage proteins interact with host proteins to control cellular processes.
• Many phage proteins have unknown functions, hindering our understanding of phage-host interactions.

Purpose of the Study:

• To develop and validate a method for identifying phage proteins involved in host-phage protein-protein interactions.
• To facilitate the functional characterization of hypothetical phage proteins.

Main Methods:

• Engineered bacterial strains with a C-terminal Strep-tag® II fused to a target host protein.
• Infection of engineered bacteria with specific bacteriophages.
• Affinity purification of the tagged host protein to co-purify interacting phage and bacterial proteins.
• Mass spectrometry analysis to identify co-purified proteins.

Main Results:

• Successfully identified phage proteins that interact with the tagged bacterial target protein.
• Demonstrated the utility of the affinity purification and mass spectrometry approach for discovering phage-host interactions.
• Provided initial insights into the functions of previously uncharacterized phage proteins.

Conclusions:

• The described method is effective for identifying phage proteins involved in host interactions.
• This approach aids in elucidating the biological roles of unknown phage proteins.
• Understanding these interactions is key to comprehending phage biology and host manipulation.