A single amino acid mutation, R42A, in the Newcastle disease virus matrix protein abrogates its nuclear localization

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Rescue of Recombinant Newcastle Disease Virus from cDNA
10:55

Rescue of Recombinant Newcastle Disease Virus from cDNA

Published on: October 11, 2013

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Zhiqiang Duan1, Juan Li1, Jie Zhu1

  • 1College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, PR China.

The Journal of General Virology
|March 8, 2014
PubMed

Insights

Mutating a basic residue in the Newcastle disease virus (NDV) matrix (M) protein prevents its nuclear entry. This mutation also reduces viral replication and pathogenicity in chickens.

Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • The Newcastle disease virus (NDV) matrix (M) protein is crucial for viral replication and pathogenesis.
  • NDV M protein exhibits nucleocytoplasmic shuttling properties, with its N-terminal region being acidic and the rest basic.

Purpose of the Study:

  • To investigate the role of N-terminal basic residues in NDV M protein's subcellular localization.
  • To determine the impact of M protein mutations on NDV replication and pathogenicity.

Main Methods:

  • Site-directed mutagenesis was used to alter a basic residue (arginine at position 42) to alanine (R42A).
  • Subcellular localization of the wild-type and mutant M proteins was assessed.
  • Recombinant NDV with the M protein R42A mutation was generated and characterized in cell culture (DF-1 cells) and in chickens.

Main Results:

  • Mutation of arginine at position 42 (R42A) disrupted the nuclear localization of the NDV M protein.
  • The recombinant NDV with the R42A mutation showed reduced viral replication in DF-1 cells.
  • The R42A mutation significantly attenuated the virulence and pathogenicity of NDV in chickens.

Conclusions:

  • Basic residues, specifically arginine at position 42 in the NDV M protein, are essential for its nuclear localization.
  • Disruption of M protein nuclear localization by the R42A mutation leads to decreased viral replication and reduced pathogenicity.
  • This study provides the first evidence that a basic residue mutation in NDV M protein can abrogate nuclear localization and attenuate viral virulence.

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