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. 1996 Sep;70(9):6244–6250. doi: 10.1128/jvi.70.9.6244-6250.1996

Abortive infection of the baculovirus Autographa californica nuclear polyhedrosis virus in Sf-9 cells after mutation of the putative DNA helicase gene.

S G Kamita 1, S Maeda 1
PMCID: PMC190649  PMID: 8709251

Abstract

Homologous recombination between the Autographa californica nuclear polyhedrosis virus (AcNPV) genome and a 0.6-kbp-long DNA fragment derived from the putative DNA helicase gene of Bombyx mori nuclear polyhedrosis virus generates eh2-AcNPV, an expanded-host-range AcNPV mutant (S. Maeda, S.G. Kamita, and A. Kondo, J. Virol. 67:6234-6238, 1993). After inoculation at a high multiplicity of infection (MOI), eh2-AcNPV replicates efficiently in both the Sf-9 (AcNPV-permissive) and BmN (non-AcNPV-permissive) cell lines. In this study, we found that after the inoculation of Sf-9 cells at a low MOI (i.e., 1 and 0.1 PFU per cell), the release of eh2-AcNPV virions was dramatically reduced (approximately 900- and 10,000-fold, respectively, at 72 h postinoculation) compared with that of wild-type AcNPV. In addition, the titer of eh2-AcNPV determined by plaque assay on Sf-9 cells was approximately 200-fold lower than that determined by plaque assay on BmN cells. Analyses of gene expression and viral DNA replication after low-MOI eh2-AcNPV inoculation of Sf-9 cells indicated that viral early genes were expressed normally. However, DNA replication and late-gene expression were significantly reduced. These findings suggested that abortive infection occurred at the stage of viral DNA replication in nearly all low-MOI eh2-AcNPV-infected Sf-9 cells. In the larvae of Spodoptera frugiperda, the organism from which Sf-9 cells are derived, the infectivity of eh2-AcNPV was lower than that of AcNPV; however, abortive infection was not found.

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Selected References

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