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vlf-1 Deletion Brought AcMNPV to Defect in Nucleocapsid Formation

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Abstract

Recent studies have provided direct evidence that the baculovirus very late factor 1 (VLF-I) of Autographa californica multicapsid nucleopolyhedrovirus (AcMNPV) was essential for BV production. To elucidate how vlf-1 deletion blocks BV production we generated a vlf-1 knockout bacmid by ET-recombination technology on AcMNPV bacmid propagated in Escherichia coli. Bacmid DNA transfection and supernatant passage assay revealed that the vlf-1 knockout bacmid was unable to replicate in cell culture, while vlf-1 repair bacmid, which was generated by transposition of the vlf-1 ORF under control of its native promoter into polyhedrin gene locus of vlf-1 knockout bacmid, resumed viral replication ability at wildtype levels. Results of these assays proved the correct construction of the vlf-1 knockout bacmid. Subsequent electron microscopy revealed that the vlf-1 knockout bacmid failed to form nueleocapsid in the nuclei of the transfected cells. Instead, intensely electron-dense virogenic stroma characteristic of viral DNA synthesis were observed. Thus, it is demonstrated for the first time that vlf-1 knockout blocked nucleocapsid formation and the defective nucleocapsid formation resulted in the abolishment of BV and ODV production. Possible roles of vlf-1 in genome processing are suggested and discussed.

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Authors and Affiliations

  1. State Key Laboratory for Biocontrol, School of Life Sciences, SunYat-Sen (Zhongshan) University, Guangzhou, People’s Republic of China

    Yi Li, Jinwen Wang, Riqiang Deng, Qinfen Zhang, Kai Yang & Xunzhang Wang

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  1. Yi Li
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  2. Jinwen Wang
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  3. Riqiang Deng
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  4. Qinfen Zhang
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  5. Kai Yang
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  6. Xunzhang Wang
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Correspondence to Xunzhang Wang.

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Li, Y., Wang, J., Deng, R. et al. vlf-1 Deletion Brought AcMNPV to Defect in Nucleocapsid Formation. Virus Genes 31, 275–284 (2005). https://doi.org/10.1007/s11262-005-3242-3

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  • DOI: https://doi.org/10.1007/s11262-005-3242-3

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