A stochastic assembly model for Nipah virus revealed by super-resolution microscopy

Area of Science:

• Virology
• Cell Biology
• Structural Biology

Background:

• Understanding enveloped virus assembly is crucial for antiviral drug development.
• Nipah virus (NiV) poses a significant public health threat due to its high mortality and efficient human transmission.
• Existing models propose matrix proteins (M) recruit glycoproteins (F and G) to the plasma membrane for assembly.

Purpose of the Study:

• To investigate the assembly mechanism of Nipah virus (NiV).
• To elucidate the roles of matrix (M), fusion (F), and attachment (G) glycoproteins in NiV assembly.
• To challenge and refine the current understanding of enveloped virus assembly.

Main Methods:

• Utilized super-resolution microscopy to observe NiV proteins on the cell plasma membrane.
• Analyzed the distribution patterns of M, F, and G proteins in live cells.
• Developed a new model for NiV assembly based on experimental observations.

Main Results:

• Nipah virus fusion (F) and attachment (G) glycoproteins are randomly distributed on the plasma membrane.
• The distribution of F and G proteins is independent of the presence or absence of matrix (M) proteins.
• NiV matrix (M) proteins self-assemble at the plasma membrane to form virus-like particles (VLPs).

Conclusions:

• The NiV assembly mechanism deviates significantly from the current model for most enveloped viruses.
• NiV matrix proteins initiate virus-like particle formation independently of glycoproteins.
• Glycoprotein incorporation into nascent NiV particles occurs stochastically, not through directed recruitment by matrix proteins.