Regulation of expression of late genes of bacteriophage T5

Area of Science:

• Molecular Biology
• Virology
• Genetics

Background:

• Bacteriophage T5 employs intricate regulatory mechanisms for gene expression during infection.
• Understanding phage gene regulation is key to controlling viral replication and developing antiviral strategies.

Purpose of the Study:

• To characterize amber mutants of bacteriophage T5 defective in gene C2.
• To elucidate the role of the gene C2 product in viral gene expression, particularly during late stages of infection.

Main Methods:

• Characterization of bacteriophage T5 amber mutants.
• Analysis of RNA and protein synthesis in infected nonpermissive cells.
• Assessment of cellular factors like lysis, energy supply, and DNA integrity.

Main Results:

• Mutants defective in gene C2 are unable to initiate normal synthesis of late RNAs and proteins.
• The gene C2 product is also required for sustained early RNA and protein synthesis during late infection stages.
• Inability to synthesize proteins is not caused by premature lysis, energy depletion, or DNA degradation.

Conclusions:

• The product of bacteriophage T5 gene C2 plays a critical role in regulating both early and late viral transcription.
• Gene C2 is essential for the coordinated expression of the viral genome throughout the infection cycle.