1887

Abstract

The basic protein of nuclear polyhedrosis virus (AcMNPV) is associated with virus DNA in virion nucleocapsids and is produced in infected cells during the late phase of gene expression. A transfer vector was constructed containing the -galactosidase gene, under the control of a copy of the putative bask protein promoter, in place of the polyhedrin gene within the AcMNPV RI fragment I. After cotransfection of cells with the transfer vector and infectious AcMNPV DNA, polyhedrin-negative recombinant viruses were selected which expressed high levels of -galactosidase. Radiolabelling of infected cell proteins showed that -galactosidase was expressed at the same time as the viral basic protein, between 8 to 24 h post-infection, with a peak synthesis at 12 to 15 h. These results demonstrated that the temporal regulation of the basic protein promoter was not affected by its position within the virus genome. Furthermore, a new baculovirus vector system is now available for high level expression of foreign genes at earlier times in infected cells.

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1990-04-01
2021-10-25
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