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Autographa californica multiple nucleopolyhedrovirus odv-e25 (Ac94) is required for budded virus infectivity and occlusion-derived virus formation

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Abstract

Autographa californica multiple nucleopolyhedrovirus (AcMNPV) odv-e25 is a core gene found in all lepidopteran baculoviruses, but its function is unknown. In this study, we generated an odv-e25-knockout AcMNPV and investigated the roles of ODV-E25 in the baculovirus life cycle. The odv-e25 knockout was subsequently rescued by reinserting the odv-e25 gene into the same virus genome. Fluorescence microscopy showed that transfection with the odv-e25-null bacmid vAcBacKO was insufficient for propagation in cell culture, whereas the ‘repair’ virus vAcBacRE was able to function in a manner similar to that of the control vAcBac. We found that odv-e25 was not essential for the release of budded viruses (BVs) into culture medium, although the absence of odv-e25 resulted in a 100-fold lower viral titer at 24 h post-transfection (p.t.). Analysis of viral DNA replication in the absence of odv-e25 showed that viral DNA replication was unaffected in the first 24 h p.t. Furthermore, electron microscopy revealed that polyhedra were found in the nucleus, while mature occlusion-derived viruses (ODVs) were not found in the nucleus or polyhedra in odv-e25 null transfected cells, which indicated that ODV-E25 was required for the formation of ODV.

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Acknowledgments

This work was supported by National 973 Basic Research Program (2011) and Zhejiang Natural Science Foundation of China (Y3110058).

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  1. College of Animal Sciences, Zhejiang University, Zijingang Campus, Hangzhou, 310058, China

    Lin Chen, Xiaolong Hu, Xingwei Xiang, Shaofang Yu, Rui Yang & Xiaofeng Wu

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  1. Lin Chen
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  2. Xiaolong Hu
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  3. Xingwei Xiang
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Correspondence to Xiaofeng Wu.

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Chen, L., Hu, X., Xiang, X. et al. Autographa californica multiple nucleopolyhedrovirus odv-e25 (Ac94) is required for budded virus infectivity and occlusion-derived virus formation. Arch Virol 157, 617–625 (2012). https://doi.org/10.1007/s00705-011-1211-9

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