Mutational analysis of bovine leukemia virus rex: Identification of a dominant-negative inhibitor

Eun A. Choi, Thomas J. Hope*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The Rex proteins of the delta-retroviruses act to facilitate the export of intron-containing viral RNAs. The Rex of bovine leukemia virus (BLV) is poorly characterized. To gain a better understanding of BLV Rex, we generated a reporter assay to measure BLV Rex function and used it to screen a series of point and deletion mutations. Using this approach, we were able to identify the nuclear export signal of BLV Rex. Further, we identified a dominant-negative form of BLV Rex. Protein localization analysis revealed that wild-type BLV Rex had a punctate nuclear localization and was associated with nuclear pores. In contrast, the dominant-negative BLV Rex mutation had a diffuse nuclear localization and no nuclear pore association. Overexpression of the dominant-negative BLV Rex altered the localization of the wild-type protein. This dominant-negative derivative of BLV Rex could be a useful tool to test the concept of intracellular immunization against viral infection in a large animal model.

Original languageEnglish (US)
Pages (from-to)7172-7181
Number of pages10
JournalJournal of virology
Issue number11
StatePublished - Jun 2005

ASJC Scopus subject areas

  • Insect Science
  • Virology
  • Microbiology
  • Immunology


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