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In this paper, the function of the ie1 gene from baculovirus Spodoptera exigua multiple nucleopolyhedrovirus (SeMNPV), belonging to group II nucleopolyhedrovirus, was studied in mammalian cells. We amplified the SeMNPV ie1 gene and expressed it by fusing to the C terminal of enhanced GFP protein in HEK 293 cells. Confocal microscopy revealed that the IE1-GFP fusion protein was localized in the nucleus of the mammalian cells. The promoter sequences of AcMNPV gp64, SeMNPV F protein and Drosophila hsp70 were also analyzed, to further study the function of SeMNPV IE1. The results showed that, in the absence of the hr sequence, IE1 improved the expression of the F promoter but didn't influence the gp64 promoter significantly, but IE1 moderately stimulated the hsp70 promoter.
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http://dx.doi.org/10.1007/s12250-010-3113-5 | DOI Listing |
Virology
July 2011
Boyce Thompson Institute at Cornell University, Ithaca, New York 14853, USA.
To examine the role of the AcMNPV lef-5 gene in the context of the infection cycle, we generated an AcMNPV lef-5 knockout virus (vAc(lef5ko)) and a complementing cell line that supports viral replication. We examined AcMNPV DNA replication, early and late gene expression, and production of infectious viral progeny in the absence of lef-5. While early gene expression and DNA replication were not reduced by the lef-5 knockout, expression of a late reporter was disrupted and representative late transcripts were dramatically reduced.
View Article and Find Full Text PDFVirol Sin
June 2010
State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China.
In this paper, the function of the ie1 gene from baculovirus Spodoptera exigua multiple nucleopolyhedrovirus (SeMNPV), belonging to group II nucleopolyhedrovirus, was studied in mammalian cells. We amplified the SeMNPV ie1 gene and expressed it by fusing to the C terminal of enhanced GFP protein in HEK 293 cells. Confocal microscopy revealed that the IE1-GFP fusion protein was localized in the nucleus of the mammalian cells.
View Article and Find Full Text PDFVirology
November 2006
Division of Biology, Molecular, Cellular, and Developmental Biology Program, Kansas State University, Manhattan, KS 66506-4901, USA.
We used a well established transient expression assay to test the ability of the baculovirus Spodoptera exigua M nucleopolyhedrovirus (SeMNPV) homologs of Autographa californica MNPV (AcMNPV) late expression factors (lefs) to activate a late promoter-reporter gene cassette in SF-21 cells. This insect-derived cell line is fully permissive for AcMNPV infection but not for SeMNPV. In the assay, 19 AcMNPV lefs stimulate optimal levels of late gene promoter activity.
View Article and Find Full Text PDFVirus Genes
February 2002
Department of Microbiology, University of the Western Cape, Bellville, South Africa.
Substantial research has been conducted on the immediate early I (ie-1) genes from the prototype baculovirus Auographa californica multicapsid nuclear polyhedrosis virus (AcMNPV) and the Orgyia pseudotsugata multicapsid nuclear polyhedrosis virus (OpMNPV). In both cases ie-1 gene products have been implicated in transcriptional activation and repression. In this study an ie-1 homolog was identified from Trichoplusia ni single nucleocapsid polyhedrosis virus (TniSNPV).
View Article and Find Full Text PDFArch Virol
December 2000
Laboratory of Virology, Agricultural University, Wageningen, The Netherlands.
The genomic position and nucleotide sequence of the immediate early gene ie1 of Spodoptera exigua multiple nucleopolyhedrovirus (SeMNPV) were determined. The SeMNPV ie1 gene had the potential to encode a protein of 714 amino acids with a predicted molecular mass of 82.0 kDa, representing the largest baculovirus IE1 known to date.
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