Translation elongation factor Tu cleaved by a phage-exclusion system

Area of Science:

• Microbiology
• Molecular Biology
• Virology

Background:

• Bacteriophage T4 exhibits limited multiplication in Escherichia coli strains harboring the defective e14 prophage.
• The e14 prophage encodes the Lit protein, a late inhibitor of T4 replication.
• Phage exclusion is mediated by the interaction between the Lit protein and a sequence encoded by the T4 gol gene.

Purpose of the Study:

• To elucidate the molecular mechanism underlying bacteriophage T4 exclusion in E. coli strains with the e14 prophage.
• To identify the specific host or phage component targeted by the Lit-gol interaction.

Main Methods:

• Investigated the interaction between the Lit protein and the gol product.
• Analyzed the effects of this interaction on host and phage gene expression and cellular processes.
• Examined the cleavage of translation elongation factor Tu (EF-Tu) upon Lit-gol interaction.

Main Results:

• The interaction between Lit and the gol product leads to severe inhibition of translation and downstream transcription.
• Lit-gol interaction specifically causes the cleavage of translation elongation factor Tu (EF-Tu).
• EF-Tu depletion is a significant factor in the observed translation inhibition and phage exclusion.

Conclusions:

• The cleavage of EF-Tu by the Lit-gol complex is a primary cause of bacteriophage T4 exclusion in e14-carrying E. coli.
• Phage exclusion mechanisms targeting conserved cellular components, like EF-Tu, can serve as valuable tools for studying fundamental cellular processes.
• This study reveals a novel mechanism of phage-host interaction with implications for molecular biology and virology research.