RNA Encapsidation and Packaging in the Phleboviruses.

Area of Science:

• Virology
• Molecular Biology

Background:

• Bunyaviridae is the largest family of segmented RNA viruses, infecting diverse hosts.
• The Phlebovirus genus within Bunyaviridae contains significant human and animal pathogens like RVFV and SFTSV.
• Phleboviruses possess tripartite RNA genomes encoding 5-7 proteins essential for viral replication.

Purpose of the Study:

• To review recent advancements in understanding the molecular mechanisms of RNA genome packaging in phleboviruses.
• To elucidate the hierarchy of interactions involved in selective co-packaging of the tripartite RNA genome.

Main Methods:

• This review synthesizes recent research findings on phlebovirus RNA packaging.
• Focuses on the molecular interactions between viral RNA (vRNA) and the nucleocapsid (N) protein.

Main Results:

• The viral nucleocapsid (N) protein plays a critical role in protecting and masking vRNA.
• N protein interaction with vRNA initiates the formation of the ribonucleoprotein (RNP) complex.
• A hierarchical interaction model is emerging, starting with N-RNA binding and progressing to RNP packaging.

Conclusions:

• Selective co-packaging of the tripartite RNA genome is a complex process initiated by N-RNA interactions.
• Further understanding of these molecular events is key to comprehending virion formation in phleboviruses.