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The genome of avian sarcoma virus UR2 was completely sequenced and found to have a size of 3,165 nucleotides. The UR2-specific transforming sequence, ros, with a length of 1,273 nucleotides, is inserted between the truncated gag gene coding for p19 and the env gene coding for gp37 of the UR2AV helper virus. The deduced amino acid sequence for the UR2 transforming protein P68 gives a molecular weight of 61,113 and shows that it is closely related to the oncogene family coding for tyrosine protein kinases. P68 contains two distinctive hydrophobic regions that are absent in other tyrosine kinases, and it has unique amino acid changes and insertions within the conserved domain of the kinases. These characteristics may modulate the activity and target specificity of P68.

journal of virology

Nucleotide sequence of avian sarcoma virus UR2 and comparison of its transforming gene with other members of the tyrosine protein kinase oncogene family