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Journal of General Virology (2001), 82, 805-812.
© 2001 Society for General Microbiology

Animal: RNA Viruses

Expression of VP5 of infectious pancreatic necrosis virus strain VR299 is initiated at the second in-frame start codon

Siegfried Weber1, Dieter Fichtner2, Thomas C. Mettenleiter1 and Egbert Mundt1

Institutes of Molecular Biology1 and Diagnostic Virology2, Friedrich-Loeffler-Institutes, Federal Research Centre for Virus Diseases of Animals, D-17498 Insel Riems, Germany

Author for correspondence: Egbert Mundt. Fax +49 38351 7151. e-mail Egbert.Mundt{at}rie.bfav.de

Infectious pancreatic necrosis virus (IPNV), a member of the Birnaviridae with two double-stranded RNA genome segments, encodes five proteins designated VP1 to VP5. To study the function of the 17 kDa nonstructural protein VP5 during virus replication several mutated IPNV genome segments A were constructed and included in a reverse genetics system for IPNV to obtain recombinant virus. Mutations between nt 68 and 85 or nt 94 and 103 in the noncoding region failed to yield viable virus. Only mutations located between nt 86 and 92 and downstream of nt 104 were tolerated, and viable virus could be generated. All IPNV generated showed no difference in replication compared with the wild-type IPNV, indicating that the absence of expression of VP5 did not influence virus growth in vitro. Furthermore, the results presented here indicate that initiation of translation of VP5 occurs at position 113, the second in-frame start codon.




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