Virus Genes

, Volume 46, Issue 1, pp 152–161 | Cite as

Functional analysis of Spodoptera frugiperda nucleopolyhedrovirus late expression factors in Sf9 cells

  • Marcelo F. Berretta
  • M. Gabriela López
  • Oscar Taboga
  • Alicia Sciocco-Cap
  • Víctor Romanowski
Article

Abstract

We used transient expression assays to assess the function of the baculovirus Spodoptera frugiperda M nucleopolyhedrovirus (SfMNPV) homologs of Autographa californica MNPV (AcMNPV) factors involved in late gene expression (lefs), in the Sf9 insect cell-line, which is permissive for both viruses. It is well-established that nineteen AcMNPV lefs support optimal levels of activity from a late promoter-reporter gene cassette in this assay. A subgroup of SfMNPV lefs predicted to function in transcription-specific events substituted the corresponding AcMNPV lefs very efficiently. When all SfMNPV lefs were assayed, including replication lefs, activity was low, but addition of two AcMNPV lefs not encoded in SfMNPV genome, resulted in augmented reporter activity. SfMNPV IE-1 was able to activate an early promoter cis-linked to an hr-derived element from SfMNPV but not from AcMNPV. However, the level of early promoter activation with SfMNPV IE-1 was lower compared to AcMNPV IE-1.

Keywords

Late expression factors AcMNPV SfMNPV 

Notes

Acknowledgments

The authors thank Dr. A. Lorena Passarelli for providing the AcMNPV lef library, plasmids pBAS35K-Luc/28mer-up+/PA and pAchr5CAPluc, and for critically reading the manuscript. We are also grateful to O. Marcelo Farinón for excellent technical assistance. This study was supported by grants from the National Institute for Agricultural Technology (INTA) and the Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT). MFB, OT, and VR hold research career awards from Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Marcelo F. Berretta
    • 1
  • M. Gabriela López
    • 2
  • Oscar Taboga
    • 2
  • Alicia Sciocco-Cap
    • 1
  • Víctor Romanowski
    • 3
  1. 1.Instituto de Microbiología y Zoología Agrícola (IMYZA)INTA CastelarCastelarArgentina
  2. 2.Instituto de Biotecnología (IB)INTA CastelarCastelarArgentina
  3. 3.Instituto de Biotecnología y Biología Molecular (IBBM, CONICET-UNLP), Facultad de Ciencias ExactasUniversidad Nacional de La PlataLa PlataArgentina

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