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. 1992 Oct;66(10):5975–5987. doi: 10.1128/jvi.66.10.5975-5987.1992

A novel oncogene, v-ryk, encoding a truncated receptor tyrosine kinase is transduced into the RPL30 virus without loss of viral sequences.

R Jia 1, B J Mayer 1, T Hanafusa 1, H Hanafusa 1
PMCID: PMC241475  PMID: 1527848

Abstract

The RPL viruses are acute oncogenic avian retroviruses isolated from chicken tumors. We carried out a genetic analysis of three of the viruses, RPL25, RPL28, and RPL30. While RPL25 and RPL28 were shown to contain the erbB oncogene, RPL30 appeared to contain a novel protein tyrosine kinase oncogene. This gene, v-ryk, was cloned and sequenced. The v-ryk oncogene contains a 1.39-kb nonretroviral sequence that includes a tyrosine kinase domain which was inserted into the viral envelope protein gp37-coding region and fused in frame with upstream gp37 to generate a P69gp37-ryk fusion oncoprotein. Unlike that of other acutely transforming retroviruses, transduction of the v-ryk gene into RPL30 did not result in deletion of viral sequences. Sequence analysis suggested that v-Ryk is more homologous to receptor-type tyrosine kinases than to nonreceptor-type kinases. By reconstitution of a virus from its cDNA, the v-ryk oncogene has been shown to be fully responsible for the transforming activity of the RPL30 virus. Antibodies specific to v-Ryk immunoprecipitated the v-Ryk oncoprotein from cells transformed by the RPL30 virus. The v-Ryk protein was shown to be first synthesized as a 150-kDa precursor and then cleaved into the mature 69-kDa gp37-Ryk fusion protein, both parts of which were found to be localized to the membrane fraction. As expected from the sequence of v-Ryk, immunoprecipitates of v-Ryk from RPL30-transformed cells were found to display a protein tyrosine kinase activity in vitro, and the levels of tyrosine-phosphorylated proteins are elevated in v-ryk-transformed cells.

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