Commandeering the Ribosome: Lessons Learned from Dicistroviruses about Translation.

Area of Science:

• Molecular Biology
• Virology
• Biochemistry

Background:

• Viruses rely on host cell machinery, particularly ribosomes, for replication.
• Viral strategies to control host translation are diverse and crucial for viral propagation.
• Internal ribosome entry sites (IRESs) are RNA elements that enable cap-independent translation initiation.

Purpose of the Study:

• To examine the role and mechanism of intergenic region IRES elements from Dicistroviridae viruses.
• To establish the Dicistroviridae IRES as a model system for studying IRES-dependent translation.
• To gain fundamental insights into the process of translation.

Main Methods:

• Bioinformatic analysis of viral genomes to identify IRES elements.
• In vitro biochemical assays to study IRES-mediated translation initiation.
• Cell-based assays to assess viral replication and translation efficiency.

Main Results:

• The intergenic region IRES of Dicistroviridae viruses efficiently recruits ribosomes for translation.
• Structural and sequence features of the Dicistroviridae IRES are critical for its function.
• The Dicistroviridae IRES serves as a robust model for investigating IRES-driven translation.

Conclusions:

• Dicistroviridae IRES elements are vital for viral replication by hijacking host ribosomes.
• This IRES family provides a valuable model for fundamental research into translation mechanisms.
• Understanding IRES function can inform antiviral strategies targeting viral translation.