Abstract
The open reading frame 117 (3h-117) of Heliothis virescens ascovirus 3h (HvAV-3h), which is a conserved coding region present in all completely sequenced ascovirus members, was characterized in this study. By RT-PCR detection, 3h-117 transcription began at 6-h post-infection (hpi) and remained stable until 168 hpi in HvAV-3h-infected Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) larvae. In addition, 3h-117 putatively encodes a 21.5-kDa protein (3H-117) predicted to be a CTD-like phosphatase. Western blot analysis using a prepared rabbit polyclonal antibody specific to 3H-117 showed that the product could be detected at 24 hpi, which remained stably detectable until 168 hpi. The same analysis also demonstrated that the 3H-117 protein localized in the virions of HvAV-3h. Immunofluorescence analysis showed that at 24 hpi, 3H-117 was mainly located in the nuclei of H. armigera larval fat body cells and later spread into the cytoplasm. In summary, our results indicate that 3H-117 is a structural protein of HvAV-3h.
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