Structure and function of negative-strand RNA virus polymerase complexes.

Area of Science:

• Virology
• Molecular Biology

Background:

• Negative-strand RNA viruses (NSVs) cause significant human, animal, and plant diseases.
• NSVs require specialized mechanisms for gene expression and genome replication due to their genome structure.
• These viruses encode a large, multifunctional RNA-dependent RNA polymerase (RdRp) essential for their life cycle.

Purpose of the Study:

• To review the structures and functions of RNA-dependent RNA polymerases (RdRps) from negative-strand RNA viruses (NSVs).
• To focus on key domains within NSV polymerases responsible for viral replication and gene expression.
• To compare shared and unique features among polymerases from Mononegavirales, Bunyavirales, and Articulavirales orders.

Main Methods:

• Literature review of existing research on NSV polymerases.
• Analysis of structural and functional data for viral RNA-dependent RNA polymerases.
• Comparative analysis of polymerases across different NSV orders.

Main Results:

• NSV polymerases possess intrinsic RNA synthesis and mRNA capping activities.
• Specific domains within the polymerase are critical for transcription and replication.
• Shared and distinct structural and functional characteristics exist among polymerases from Mononegavirales, Bunyavirales, and Articulavirales.

Conclusions:

• Understanding NSV polymerase structure-function relationships is key to combating viral diseases.
• Comparative analysis reveals conserved and divergent strategies for viral RNA metabolism.
• This review provides a foundation for developing antiviral strategies targeting NSV polymerases.