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- W1873706849 abstract "Previously, we produced transformed insect cell lines that can express a selected foreign protein constitutively, in the absence of baculovirus infection (D. L. Jarvis, J. G. W. Fleming, G. R. Kovacs, M. D. Summers, and L. A. Guarino, Bio/Technology 8:950-955, 1990). These cells contain stably integrated copies of chimeric genes consisting of the promoter from an immediate-early baculovirus gene, IE1, and the sequences encoding either human tissue plasminogen activator or Escherichia coli beta-galactosidase. Transcription of the integrated genes in these cells is specifically controlled by the IE1 promoter. The purpose of this study was to determine how baculovirus infection influences IE1-mediated foreign protein production by these stably transformed insect cell lines. The results showed that viral infection transiently stimulated and then strongly inhibited the production of both tissue plasminogen activator, a secreted protein, and beta-galactosidase, an intracellular protein. These effects reflected virus-induced changes in the steady-state levels of RNA produced by the integrated genes. Transient assays showed that expression of the viral IEN gene alone could account for the increased levels of RNA observed early in infection. The precise mechanism accounting for the decreased levels of RNA observed later in infection was not determined. However, we obtained evidence that the native IE1 promoter remains active throughout infection, which suggested indirectly that the integrated IE1 promoter is transcriptionally inactivated at late times of baculovirus infection. Thus, the same promoter behaved quite differently late in infection, depending on its local environment. Neither methylation nor degradation appeared to be responsible for inactivating IE1-mediated expression of the integrated genes. The significance of these results with respect to the baculovirus-host interaction and the practical applications of stably transformed insect cell lines are discussed." @default.
- W1873706849 created "2016-06-24" @default.
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- W1873706849 date "1993-05-01" @default.
- W1873706849 modified "2023-09-23" @default.
- W1873706849 title "Effects of baculovirus infection on IE1-mediated foreign gene expression in stably transformed insect cells" @default.
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- W1873706849 doi "https://doi.org/10.1128/jvi.67.5.2583-2591.1993" @default.
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