Revisiting Viral RNA-Dependent RNA Polymerases: Insights from Recent Structural Studies.

Area of Science:

• Virology
• Structural Biology
• Biochemistry

Background:

• RNA-dependent RNA polymerases (RdRPs) are essential viral enzymes responsible for RNA genome replication and transcription.
• RdRPs share a conserved structural core, resembling a cupped right hand with distinct subdomains (fingers, palm, thumb).
• Despite structural similarities, significant variations exist in the mechanistic details of RNA interaction and polymerization among different RdRPs.

Purpose of the Study:

• To review and explore the mechanistic incongruities in RNA binding and polymerization among various RNA-dependent RNA polymerases (RdRPs).
• To highlight recent structural studies that elucidate these differences.
• To examine the role of diverse cofactors, RNA moieties, analogs, and inhibitors in RdRP function.

Main Methods:

• Literature review of recent structural studies on RNA-dependent RNA polymerases (RdRPs).
• Analysis of structural data focusing on RdRP complexes with cofactors, RNA, analogs, and inhibitors.
• Comparative analysis of structural features and mechanistic details.

Main Results:

• Recent structural studies reveal significant differences in the mechanisms of RNA binding and polymerization across various RdRPs.
• The review highlights how variations in RdRP structure, despite a common core, lead to distinct functional outcomes.
• Interactions with cofactors, RNA, analogs, and inhibitors provide insights into mechanistic diversity.

Conclusions:

• The structural and mechanistic diversity of RNA-dependent RNA polymerases (RdRPs) is substantial, despite conserved core structures.
• Understanding these incongruities is crucial for comprehending viral replication strategies.
• Further structural investigations are vital for developing targeted antiviral therapies.