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Nuclear localization and secretion competence are conserved among henipavirus matrix proteins
Elisabeth C McLinton1, Kylie M Wagstaff2, Alexander Lee2
1Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia.
The Journal of General Virology
|January 6, 2017
Summary
Nuclear localization of henipavirus matrix proteins is conserved across species, essential for viral replication. This pathway, involving key lysine residues, is crucial for virus budding in both human and bat cells.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Henipaviruses are zoonotic pathogens (Paramyxoviridae family) originating from bats, causing severe disease in animals and humans.
- Nipah virus (NiV) and Hendra virus are highly virulent, while Cedar virus appears non-pathogenic.
- Viral assembly typically occurs in the cytoplasm, orchestrated by the matrix (M) protein.
Purpose of the Study:
- To investigate if nuclear localization of the M protein is a conserved feature among henipaviruses.
- To compare the M protein's nuclear trafficking efficiency and budding competency across different henipaviruses.
- To determine the role of the M protein's nuclear localization signal (NLS) in replication and budding.
Main Methods:
- Live-cell confocal microscopy to track GFP-fused M proteins.
- Comparative analysis in human and bat cell lines.
- Site-directed mutagenesis of the M protein's bipartite NLS.
Main Results:
- Nuclear translocation of GFP-M protein was observed across various henipaviruses, including NiV, Cedar virus, Kumasi virus, and Mojiang virus.
- M protein nuclear localization and virus-like particle budding efficiency varied among the tested henipaviruses.
- A key lysine residue within the M protein's NLS was essential for nuclear import, export, and budding induction, consistent with NiV-M.
Conclusions:
- The nucleocytoplasmic trafficking pathway of the M protein is a conserved mechanism in henipavirus replication.
- This pathway is essential for viral assembly and budding in both human and bat host cells.
- Understanding this conserved mechanism offers potential targets for antiviral strategies against henipaviruses.
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