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Updated: May 9, 2026

Overexpressing and Purifying a Toxic Nuclease from Escherichia coli
08:13

Overexpressing and Purifying a Toxic Nuclease from Escherichia coli

Published on: August 29, 2025

Virus-encoded endonucleases: expected and novel functions.

G Sullivan Read1

  • 1Division of Cell Biology and Biophysics, University of Missouri, Kansas City, Kansas City, MO, USA.

Wiley Interdisciplinary Reviews. RNA
|August 1, 2013
PubMed
Summary
This summary is machine-generated.

Viral endonucleases like Vhs, SOX, and PB1 cleave RNA for gene expression. These enzymes also have secondary roles in translation, genome processing, and host-viral interactions.

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Kinetic Screening of Nuclease Activity using Nucleic Acid Probes

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Area of Science:

  • Virology
  • Molecular Biology
  • Enzymology

Background:

  • Viral endonucleases are crucial for viral gene expression, impacting RNA processing, function, and turnover.
  • Key examples include herpes simplex virus Vhs, Kaposi Sarcoma Herpesvirus SOX, and influenza virus PB1.
  • These enzymes possess diverse functions beyond simple RNA cleavage.

Purpose of the Study:

  • To review the multifaceted roles of viral endonucleases in host-pathogen interactions.
  • To highlight both established and emerging functions of Vhs, SOX, and PB1.
  • To discuss their significance in viral replication strategies and host immune evasion.

Main Methods:

  • Literature review of studies on viral endonucleases.
  • Analysis of biochemical and genetic data on Vhs, SOX, and PB1.
  • Comparative examination of endonuclease functions across different viruses.

Main Results:

  • Vhs accelerates RNA turnover, aids viral gene expression, and counters innate immunity.
  • SOX protein reduces host protein synthesis and processes viral genomes.
  • PB1 endonuclease facilitates viral mRNA synthesis by snatching capped oligonucleotides.

Conclusions:

  • Viral endonucleases exhibit complex functions beyond RNA cleavage, including translation regulation and genome maturation.
  • These enzymes are critical for efficient viral replication and pathogenesis.
  • Understanding these dual roles provides insights into viral strategies and potential therapeutic targets.