Inhibition of Reovirus by Mycophenolic Acid Is Associated with the M1 Genome Segment

AUTOR(ES)

Hermann, Laura L.

FONTE

American Society for Microbiology

RESUMO

Mycophenolic acid (MPA), an inhibitor of IMP dehydrogenase, inhibits reovirus replication and viral RNA and protein production. In mouse L929 cells, antiviral effects were greatest at 30 μg of MPA/ml. At this dosage, MPA inhibited replication of reovirus strain T3D more than 1,000-fold and inhibited replication of reovirus strain T1L nearly 100-fold, compared to non-drug-treated controls. Genetic reassortant analysis indicated the primary determinant of strain-specific differences in sensitivity to MPA mapped to the viral M1 genome segment, which encodes the minor core protein μ2. MPA also inhibited replication of both strains of reovirus in a variety of other cell lines, including Vero monkey kidney and U373 human astrocytoma cells. Addition of exogenous guanosine to MPA-treated reovirus-infected cells restored viral replicative capacity to nearly normal levels. These results suggest the μ2 protein is involved in the uptake and processing of GTP in viral transcription in infected cells and strengthens the evidence that the μ2 protein can function as an NTPase and is likely a transcriptase cofactor.

Documentos Relacionados

• The reovirus M1 gene, encoding a viral core protein, is associated with the myocarditic phenotype of a reovirus variant.
• The M1 gene is associated with differences in the temperature optimum of the transcriptase activity in reovirus core particles.
• The Reovirus Protein μ2, Encoded by the M1 Gene, Is an RNA-Binding Protein
• Comparisons of the M1 genome segments and encoded μ2 proteins of different reovirus isolates
• The S4 Genome Segment of Baboon Reovirus Is Bicistronic and Encodes a Novel Fusion-Associated Small Transmembrane Protein