Human DICER helicase domain recruits PKR and modulates its antiviral activity
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View abstract on PubMed
Summary
This summary is machine-generated.The RNA silencing protein DICER interacts with viral proteins during infection. Deleting its helicase domain grants antiviral properties, independent of RNA interference but dependent on PKR.
Area Of Science
- Virology
- Immunology
- Molecular Biology
Background
- Type I interferon (IFN) is central to the mammalian antiviral innate immune response.
- The role of RNA silencing, including the ribonuclease DICER, in antiviral defense requires further elucidation.
- Type I IFN and RNA silencing pathways may function antagonistically.
Purpose Of The Study
- To investigate the role and interactions of DICER during alphavirus infection in human cells.
- To identify proteins interacting with DICER during viral infection using proteomics.
- To determine the functional significance of DICER-protein interactions in antiviral defense.
Main Methods
- Proteomics analysis to identify DICER interactome during viral infection.
- Investigating interactions between DICER and viral proteins like DHX9, ADAR-1, and PKR.
- Functional assays to assess antiviral properties of DICER mutants, specifically the helicase domain.
Main Results
- DICER specifically interacts with double-stranded RNA binding proteins and RNA helicases during alphavirus infection.
- Proteins including DHX9, ADAR-1, and protein kinase RNA-activated (PKR) are enriched with DICER in infected cells.
- Deletion of the DICER helicase domain results in antiviral activity, independent of RNA interference but dependent on PKR.
Conclusions
- DICER's helicase domain is crucial for its interactions with host proteins during viral infection.
- DICER can exert antiviral effects through a PKR-dependent mechanism, separate from its canonical RNA silencing function.
- These findings reveal a novel antiviral role for DICER mediated by protein-protein interactions.
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