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Running With Scissors: Evolutionary Conflicts Between Viral Proteases and the Host Immune System.

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Viral proteases antagonize host immunity by cleaving viral polyproteins and host targets. Host immune evolution drives viral protease evolution, shaping host range and disease.

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Area of Science:

  • Virology
  • Immunology
  • Evolutionary Biology

Background:

  • Pathogens utilize proteases to disrupt host immune responses.
  • Positive-sense single-stranded RNA [(+)ssRNA] viruses encode proteases essential for replication and host manipulation.

Purpose of the Study:

  • To explore the evolutionary dynamics between viral proteases and host immune factors.
  • To understand how viral protease-host interactions influence viral evolution and pathogenicity.

Main Methods:

  • Comparative analysis of viral protease sequences and cleavage sites.
  • Examination of host gene evolution in response to viral pressure.
  • Review of existing literature on viral protease-host interactions.

Main Results:

  • Viral proteases face evolutionary constraints but engage in 'arms races' with host factors.
  • Host gene evolution leads to cleavage avoidance or 'tripwire' immune activation.
  • Viral protease and cleavage site divergence is driven by host-virus coevolution.

Conclusions:

  • Evolutionary conflicts between viral proteases and host factors shape viral diversity and pathogenicity.
  • Understanding these interactions is crucial for predicting host range and zoonotic potential.
  • An evolutionary perspective is vital for studying viral protease-host interactions.