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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Members of the NF90/NFAR protein group are involved in the life cycle of a positive-strand RNA virus.

A major issue of current virology concerns the characterization of cellular proteins that operate as functional components of the viral multiplication process. Here we describe a group of host factors designated as 'NFAR proteins' that are recruited by the replication machinery of bovine viral diarrhea virus, a close relative of the human pathogen hepatitis C virus. The NFAR proteins associate specifically with both the termini of the viral RNA genome involving regulatory elements in the 5' and 3' non-translated regions. Modification of the protein interaction sites in the 3' non-translated region yielded viral RNAs that were replication deficient. Viral replication was also inhibited by RNAi approaches that reduced the concentration of RNA helicase A, a member of the NFAR group, in the host cell's cytoplasm. Further experimental data suggest that NFAR proteins mediate a circular conformation of the viral genome that may be important for the coordination of translation and replication. Because NFAR proteins are presumed components of the antiviral response, we suspect that viral recruitment may also serve to weaken cellular defense mechanisms.[1]


  1. Members of the NF90/NFAR protein group are involved in the life cycle of a positive-strand RNA virus. Isken, O., Grassmann, C.W., Sarisky, R.T., Kann, M., Zhang, S., Grosse, F., Kao, P.N., Behrens, S.E. EMBO J. (2003) [Pubmed]
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