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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Nineteen baculovirus open reading frames, including LEF-12, support late gene expression.

A set of 18 plasmid subclones of the Autographa californica nuclear polyhedrosis virus genome, each containing an identified late expression factor gene (lef), supports expression from a late viral promoter in transient expression assays in the SF-21 cell line derived from Spodoptera frugiperda. We have constructed a further set of plasmids in which each lef open reading frame (ORF) is controlled by the Drosophila melanogaster heat shock protein 70 ( hsp70) promoter and epitope tagged. Failure of this set of plasmids to support transient late gene expression, and the inability of the p47 ORF to replace the p47-containing plasmid supplied in the lef plasmid library, led to the identification of a 19th late expression factor gene (lef-12) located adjacent to the p47 gene. The sequence of lef-12 is predicted to encode a protein of 21 kDa with no homology to any previously identified protein. The set of 19 hsp70-controlled lef ORFs (HSEpiHis lef library) supports transient expression from a late viral promoter. lef-12 did not affect expression from an early baculovirus promoter. In TN-368 cells, which are also permissive for virus replication, lef-12 provided a stimulatory effect but did not appear to be essential.[1]


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