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. 1988 Mar;62(3):703–714. doi: 10.1128/jvi.62.3.703-714.1988

v-rel oncoproteins in the nucleus and in the cytoplasm transform chicken spleen cells.

T D Gilmore 1, H M Temin 1
PMCID: PMC253623  PMID: 2828665

Abstract

The transforming protein encoded by the v-rel oncogene of the highly oncogenic avian retrovirus reticuloendotheliosis virus strain T (Rev-T) is a 59,000-dalton protein, p59v-rel. The mechanism by which p59v-rel induces transformation of early lymphoid cells is unknown. As a step towards understanding the mechanism of v-rel-induced transformation, we sought to establish the subcellular site of action of p59v-rel. In this report, we show that p59v-rel contains sequences that are necessary for its efficient localization in the nucleus of infected chicken embryo fibroblasts. These v-rel sequences when added to the normally cytoplasmic protein, beta-galactosidase, directed that protein to the nucleus. A mutation in the v-rel nuclear-localizing sequence did not affect the transforming function, although it did alter the nuclear-localizing function. The addition of a supplemental nuclear-localizing sequence from simian virus 40 large T-antigen to v-rel resulted in the expression of a transforming rel protein which was located exclusively in the nucleus of transformed spleen cells, in contrast to wild-type p59v-rel, which was largely cytoplasmic in transformed spleen cells. Our results support the hypothesis that v-rel encodes a protein which can act either in the nucleus or in the cytoplasm to transform spleen cells.

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Selected References

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