Impact of Vesicular Stomatitis Virus M Proteins on Different Cellular Functions

Area of Science:

• Virology
• Molecular Biology
• Cell Biology

Background:

• Vesicular stomatitis virus (VSV) possesses three distinct matrix (M) proteins: M1, M2, and M3.
• The functions and cellular impacts of these VSV M proteins are not fully elucidated.

Purpose of the Study:

• To investigate the individual and shared cellular effects of VSV M1, M2, and M3 proteins.
• To understand the mechanisms by which these viral proteins interfere with host cell processes.

Main Methods:

• Expression of individual VSV M proteins (M1, M2, M3) in host cells.
• Analysis of cytopathic effects, including cell morphology and protein synthesis.
• Assessment of viral particle budding and plasma membrane permeability.
• Investigation of mRNA transport and splicing factor redistribution.

Main Results:

• Individual expression of M1, M2, and M3 induced cytopathic effects like cell rounding and detachment.
• VSV M proteins partially inhibited cellular protein synthesis via an indirect mechanism.
• M1 promoted virus particle budding without increasing membrane permeability.
• M2 and M3 did not interact with the cellular membrane or induce vesicle budding.
• All three M proteins interfered with nuclear mRNA export and modulated splicing factor localization.

Conclusions:

• VSV M1, M2, and M3 proteins exhibit distinct and shared activities that disrupt host cell functions.
• These viral proteins significantly impact host cell machinery, including protein synthesis and mRNA transport.
• Understanding these interactions is crucial for comprehending VSV pathogenesis and developing antiviral strategies.