Transcription of vesicular stomatitis virus is required to shut off cellular RNA synthesis

Area of Science:

• Virology
• Molecular Biology
• Cell Biology

Background:

• Vesicular stomatitis virus (VSV) is a non-segmented negative-strand RNA virus.
• Understanding viral mechanisms that inhibit host cell processes is crucial for virology research.

Purpose of the Study:

• To investigate the role of VSV transcription in the inhibition of host cell RNA synthesis.
• To identify viral factors responsible for the shutdown of cellular RNA production.

Main Methods:

• Infection of mouse myeloma (MPC-11) cells with VSV temperature-sensitive (ts) mutants.
• Analysis of cellular RNA synthesis rates under different infection conditions and temperatures.
• Identification of viral products synthesized post-infection.

Main Results:

• VSV mutants permissive for transcription rapidly inhibited cellular RNA synthesis.
• VSV mutants restricted in transcription did not inhibit RNA synthesis, even at high multiplicities.
• A viral product synthesized 30-60 minutes after permissive infection was essential for sustained RNA synthesis inhibition.

Conclusions:

• VSV transcription is essential for the progressive inhibition of host cell RNA synthesis.
• A specific viral product, synthesized during permissive infection, plays a critical role in this process.
• These findings elucidate a key viral strategy for host cell manipulation.