Temporal expression of the AcMNPV lef-4 gene and subcellular localization of the protein.

Autographa californica nucleopolyhedrovirus (AcMNPV) lef-4 gene [ORF 90; Ayres et al. (1994) Virology 202, 586-605] is involved in both late and very late gene expression [Passarelli and Miller (1993) Virology 197, 704-714]. The transcriptional properties of this gene have been analyzed. It is transcribed as a single 1.6-kb mRNA and transcripts were first detected 3 h postinfection (pi). The extremities of the transcript have been mapped by primer extension and 3' RACE-PCR to positions -56 from the translation start codon and +96 downstream of the stop codon. A rabbit polyclonal antiserum has been raised against an internal polypeptide of LEF-4. A 55-kDa protein was observed by Western blot analysis from 5 h pi. LEF-4 localizes preferentially in the nucleus of infected cells and is associated with the virogenic stroma.