Coat protein complex I facilitates dengue virus production

Area of Science:

• Virology
• Cell Biology
• Molecular Biology

Background:

• Dengue hemorrhagic fever is a severe disease caused by the dengue virus (DENV).
• DENV infection relies on host cellular trafficking pathways for viral particle production.
• Understanding host proteins involved in DENV trafficking is crucial for elucidating disease mechanisms.

Purpose of the Study:

• To investigate the roles of coat protein complexes and SNAREs in DENV replication.
• To determine how these host proteins influence viral particle production and DENV pathogenesis.

Main Methods:

• RNA interference was used to deplete coat proteins (COPI, COPII) and SNAREs (STX5, NSF) in DENV-infected Huh7 cells.
• DENV production levels and viral protein expression were quantified after protein depletion.

Main Results:

• Depletion of COPI and COPII significantly reduced DENV production, while STX5 and NSF depletion had no effect.
• Silencing of COPI led to a significant decrease in DENV proteins (C, prM, E, NS1).
• COPI facilitated DENV production across different serotypes and in endothelial cells.

Conclusions:

• Coat protein complex, specifically COPI, plays a critical role in DENV replication and virion production.
• COPI is a key host factor essential for efficient DENV infection, independent of serotype.