Revisiting Alphavirus RNA packaging and assembly-A complex story with multiple angles.

Area of Science:

• Virology
• Molecular Biology
• Structural Biology

Background:

• Alphaviruses are enveloped, positive-sense single-stranded RNA viruses with icosahedral structures.
• Transmitted by invertebrates, they infect diverse vertebrates globally.
• Virus assembly and budding involve intricate protein-RNA, protein-protein, and protein-glycoprotein interactions.

Purpose of the Study:

• To provide an updated overview of alphavirus assembly and budding processes.
• To highlight key recent findings and remaining knowledge gaps.
• To identify areas for future research in alphavirus structure and replication.

Main Methods:

• Review of existing literature on alphavirus structure, assembly, and budding.
• Analysis of protein-protein and protein-RNA interactions.
• Synthesis of recent structural and mechanistic studies.

Main Results:

• Significant progress in understanding alphavirus structure and assembly over the past decade.
• Identification of critical roles for specific interactions in packaging, core formation, and budding.
• Persistent fundamental questions regarding selective RNA packaging and precise control of assembly steps.

Conclusions:

• Alphavirus assembly and budding are complex, highly regulated processes.
• Despite advances, fundamental aspects require further investigation.
• Continued research is crucial for a comprehensive understanding of alphavirus replication and pathogenesis.