Multiple RNA virus matrix proteins interact with SLD5 to manipulate host cell cycle

Area of Science:

• Virology
• Molecular Biology
• Cell Biology

Background:

• Enveloped RNA viruses' matrix proteins are crucial for their life cycle, often involving nucleocytoplasmic shuttling.
• Influenza virus matrix protein 1 (M1) was previously shown to arrest the cell cycle by interacting with SLD5, a GINS complex component essential for cell cycle progression.

Purpose of the Study:

• To investigate if M proteins from other enveloped RNA viruses also interact with SLD5.
• To determine if this interaction leads to cell cycle arrest and affects viral replication.
• To elucidate the common mechanisms enveloped RNA viruses employ to manipulate host cell cycles.

Main Methods:

• Protein-protein interaction assays to test M protein binding to SLD5.
• Cell cycle analysis (e.g., flow cytometry) to detect G0/G1 arrest.
• Viral replication assays in vitro and in vivo.
• Interferon signaling pathway analysis.

Main Results:

• M proteins from Vesicular Stomatitis Virus (VSV), Sendai Virus (SeV), and Human Immunodeficiency Virus (HIV) were found to interact with SLD5.
• Infection with VSV/SeV and expression of VSV/SeV/HIV M proteins induced G0/G1 phase cell cycle arrest.
• Overexpression of SLD5 partially rescued the cell cycle arrest caused by VSV/SeV infection and VSV M protein.
• SLD5 suppressed VSV replication and enhanced type I interferon signaling.

Conclusions:

• Targeting SLD5 by M protein appears to be a conserved strategy among multiple enveloped RNA viruses to block host cell cycle progression.
• Hijacking the host replication factor SLD5 is a key mechanism viruses use to manipulate cell cycle during infection.
• These findings offer new insights into virus-host interactions and potential therapeutic targets.