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Sequence analysis of a reovirus isolated from the winter moth Operophtera brumata (Lepidoptera: Geometridae) and its parasitoid wasp Phobocampe tempestiva (Hymenoptera: Ichneumonidae)

By Robert I. Graham, Shujing Rao, Steven M. Sait, Houssam Attoui, Peter P. C. Mertens, Rosemary S. Hails and Robert D. Possee

Abstract

A reovirus was isolated from Operophtera brumata (ObRV) and its parasitoid wasp Phobocampe tempestiva. Each of the 10 dsRNA genome segments of ObRV was sequenced and shown to contain a single open reading frame (ORF). Conserved motifs ([+ve] 5′-AAATAAA … G/TAGGTT-3′) were found at the termini of each segment, with the exception of Seg-6 and Seg-8, where the 5′ termini were 5′-AACAAA…-3′. The putative proteins encoded by each segment were compared with those of other members of the family Reoviridae. Phylogenetic comparisons to published sequences for the RNA-dependent RNA polymerase genes from other reoviruses indicated that ObRV is most closely related to members of the genus Cypovirus. However, unlike the cypoviruses, ObRV has a double-layered capsid structure. When the protein encoded by ObRV Seg-10 was expressed (by inserting the open reading frame into a baculovirus expression vector) no ‘occlusion bodies’ were observed in the recombinant baculovirus infected insect cell cultures. This suggests that unlike the cypoviruses, Seg-10 of ObRV does not contain a polyhedrin gene. Further phylogenetic comparisons also identified relationships between Seg-2 and Seg-10 of ObRV, and genes of Diadromus pulchellus Idnoreovirus 1 (DpIRV1), suggesting that ObRV represents a new species from the genus Idnoreovirus

Topics: Biology and Microbiology, Data and Information
Year: 2008
DOI identifier: 10.1016/j.virusres.2008.02.005
OAI identifier: oai:nora.nerc.ac.uk:6604
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