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Journal of Virology, December 1998, p. 10197-10206, Vol. 72, No. 12
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Nineteen Baculovirus Open Reading Frames, Including LEF-12, Support Late Gene Expression

Jeffrey C. Rapp, Joyce A. Wilson, and Lois K. Miller*

Departments of Entomology and Genetics, The University of Georgia, Athens, Georgia 30602

Received 6 August 1998/Accepted 22 August 1998

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.

* Corresponding author. Mailing address: Department of Entomology, University of Georgia, 413 Biological Sciences Bldg., Athens, GA 30602-2603. Phone: (706) 542-2294. Fax: (706) 542-2279. E-mail: miller{at}arches.uga.edu.

Journal of Virology, December 1998, p. 10197-10206, Vol. 72, No. 12
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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