EXO70 protein influences dengue virus secretion

Area of Science:

• Virology
• Cell Biology
• Molecular Biology

Background:

• The mechanisms by which flaviviruses, like dengue virus (DENV), exit host cells via exocytosis are not fully understood.
• Host cell machinery involvement in viral particle release remains an area of active investigation.

Purpose of the Study:

• To investigate the role of exocyst components, specifically EXO70, in facilitating dengue virus (DENV) exocytosis.
• To determine if DENV utilizes the exocyst complex for efficient virus particle release.

Main Methods:

• Knock-down experiments to reduce EXO70 protein levels in DENV-infected cells.
• Analysis of viral transcription, translation, and secretion.
• Monitoring of EXO70 expression levels post-DENV infection.
• Investigating the influence of DENV proteins (envelope, pre-membrane) on EXO70 expression.

Main Results:

• Knock-down of EXO70 significantly reduced dengue virus production.
• EXO70 primarily affects virus egression/secretion, not viral transcription or translation.
• EXO70 expression is upregulated post-DENV infection, particularly with co-expression of DENV envelope and pre-membrane proteins.
• The pre-membrane protein may facilitate proper folding of the envelope protein, influencing EXO70 upregulation.

Conclusions:

• The host protein EXO70 plays a crucial role in dengue virus exocytosis.
• EXO70 facilitates the secretion of DENV particles from infected cells.
• Upregulation of EXO70 during infection likely supports efficient virus release.