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. 1986 Jul;59(1):120–126. doi: 10.1128/jvi.59.1.120-126.1986

Localization of the v-rel protein in reticuloendotheliosis virus strain T-transformed lymphoid cells.

S L Simek, R M Stephens, N R Rice
PMCID: PMC253046  PMID: 3012110

Abstract

The protein (p59rel) encoded by the transforming gene of reticuloendotheliosis virus strain T (REV-T) has been identified in REV-T-transformed avian lymphoid cells by using antisera raised against synthetic peptides whose sequences were derived from three nonoverlapping regions of v-rel (N. R. Rice, T. D. Copeland, S. Simek, S. Oroszlan, and R. V. Gilden, Virology 149:217-229, 1986). To obtain polyclonal antibodies directed against a larger number of p59rel epitopes, a 262-amino acid segment was expressed in bacteria. Antisera raised against this fusion protein (v-delta-rel) precipitated p59rel from lysates of [35S]methionine-labeled REV-T-transformed cells, thus confirming previous results obtained with the peptide antisera. We used this new antiserum to localize p59rel in REV-T-transformed cells by subcellular fractionation using differential centrifugation and by indirect immune fluorescent staining. After fractionation and immune precipitation, the majority of p59rel was found in the cytosolic fraction. Indirect immunofluorescence experiments also gave results consistent with the cytoplasmic localization of the v-rel protein in transformed lymphoid cells. In previous studies (Rice et al., Virology 149:217-229, 1986) it was shown that immune precipitates formed with one of the three p59rel peptide antisera possessed in vitro protein kinase activity. Immune precipitates formed with the fusion protein antiserum also showed kinase activity in the in vitro assay. Most of this activity was found in the soluble cytoplasmic fraction, indicating that the kinase may be p59rel or a protein closely associated with it.

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Selected References

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