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Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Coronaviral methyltransferases (MTases), specifically nsp10/16 and nsp14, are vital for viral RNA cap formation in the cytoplasm.
  • The viral RNA cap is essential for RNA stability and evading the host's innate immune system, which targets non-capped RNA for degradation and antiviral responses.

Purpose of the Study:

  • To critically summarize recent advancements in the field of coronaviral MTases.
  • To highlight the scientific scrutiny and progress in understanding these enzymes since the COVID-19 pandemic.

Main Methods:

  • Review and critical analysis of published research on coronaviral MTases.
  • Examination of structural data (X-ray and cryo-EM) of MTases and their complexes.
  • Summary of findings from high-throughput screening and structure-guided inhibitor design.

Main Results:

  • X-ray and cryo-EM structures of coronaviral MTases, including complexes, have been determined.
  • Potent inhibitors of these enzymes have been discovered through high-throughput screening and rational drug design.

Conclusions:

  • Coronaviral MTases are central targets due to their essential roles in viral replication and immune evasion.
  • Significant progress has been made in understanding and inhibiting these enzymes, offering potential therapeutic avenues.