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Host factors involved in West Nile virus replication
1Biology Department, Georgia State University, Atlanta 30303, USA. biomab@panther.gsu.edu
Abstract:
Viruses use cell proteins during many stages of their replication cycles, including attachment, entry, translation, transcription/replication, and assembly. Mutations in the cell proteins involved can cause disruptions of these critical host-virus interactions, which in turn can affect the efficiency of virus replication. These host-virus interactions also represent novel targets for the development of new antiviral agents. The different alleles of the murine Flv gene confer resistance or susceptibility to flavivirus-induced disease and provide a natural mutant system for the study of a host protein that can alter the outcome of a flavivirus infection. Since flaviviruses, such as West Nile virus, replicate in mosquitoes, mammals, and birds during their natural transmission cycles, it is expected that the critical cell proteins used by these viruses will be ones that are highly conserved between divergent host species. Our laboratory has focused on the identification and characterization of the flavivirus resistance gene product and of cell proteins that interact with the 3' terminal regions of the West Nile virus genomic and antigenomic RNAs. The 3' terminal regions of the viral RNAs function as promotors for viral RNA replication. Cell proteins that bind to the viral 3' RNAs were detected by gel shift and UV-induced cross-linking assays. Individual proteins were then purified and partially sequenced. Mutation of a mapped, protein-binding site within the 3' terminal region of the viral RNA in an infectious West Nile virus clone was used to demonstrate the functional importance of one of the cell proteins for efficient West Nile virus replication. Data from additional studies suggested possible roles for this viral RNA-cell protein interaction during the flavivirus replication cycle.
Insights
Host cell proteins are crucial for flavivirus replication. Identifying these interactions, like those with West Nile virus RNA, can lead to new antiviral strategies and understanding disease resistance.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Viruses rely on host cell proteins for replication, making these interactions key targets for antiviral development.
- Host genetic variations, such as murine Flv gene alleles, influence flavivirus disease outcomes.
- Flaviviruses, including West Nile virus, infect diverse species, necessitating study of conserved host-virus interactions.
Purpose of the Study:
- To identify and characterize host cell proteins interacting with West Nile virus RNA.
- To investigate the role of these host-virus interactions in flavivirus replication and disease.
- To explore potential antiviral targets based on these interactions.
Main Methods:
- Gel shift and UV-induced cross-linking assays to detect viral RNA-binding proteins.
- Protein purification and partial sequencing.
- Site-directed mutagenesis of West Nile virus RNA to assess protein-binding site importance.
Main Results:
- Identified and purified host cell proteins that bind to the 3' terminal regions of West Nile virus RNA.
- Demonstrated that a specific protein-binding site mutation in the viral RNA impairs efficient replication.
- Provided evidence for the functional significance of viral RNA-cell protein interactions in flavivirus replication.
Conclusions:
- Host cell proteins interacting with viral RNA are essential for efficient flavivirus replication.
- Understanding these interactions offers insights into flavivirus pathogenesis and disease resistance.
- These host-virus interactions represent promising targets for novel antiviral therapies.