Mechanisms for enveloped virus budding: can some viruses do without an ESCRT?

Area of Science:

• Virology
• Cell Biology
• Molecular Biology

Background:

• Enveloped viruses replicate by budding from the host plasma membrane, often utilizing cellular machinery.
• The vacuolar protein sorting (VPS) pathway, involved in forming multivesicular bodies, is a key mechanism hijacked by some viruses for budding.
• Variations exist, with some viruses requiring additional factors or employing VPS-independent pathways.

Purpose of the Study:

• To explore the diverse mechanisms of enveloped virus budding.
• To investigate the role of host-pathogen interactions in virus assembly.
• To identify alternative pathways beyond the VPS pathway for virus release.

Main Methods:

• Analysis of viral "late" (L) domain motifs.
• Investigation of host protein interactions, particularly those in the VPS pathway.
• Comparative studies of different enveloped viruses to identify budding requirements.

Main Results:

• Identification of viruses utilizing the VPS pathway via L domains.
• Discovery of viruses employing alternative budding mechanisms, independent of the VPS pathway.
• Hypothesized alternative pathways including cell abscission and spontaneous budding via lipid microdomains.

Conclusions:

• Virus budding is a complex process with multiple strategies.
• Understanding novel virus-host interactions is crucial for deciphering virus assembly.
• Further research on understudied enveloped viruses will illuminate diverse budding mechanisms.