title: Genome structure of avian sarcoma virus Y73 and unique sequence coding for polyprotein p90.
abstract: The genome structure of a newly isolated sarcoma virus, Y73, was studied. Y73 is a defective, potent sarcomagenic virus and contains 4.8-kilobase (kb) RNA as its genome; in contrast, helper virus associated with Y73 had 8.5-kb RNA, similar to other avian leukemia viruses. Fingerprinting analysis these RNAs demonstrated that the 4.8-kb RNA contains a specific RNA sequence of 2.5 kb, which represents the transforming gene (yas) of Y73. This specific sequence was mapped in the middle of the genome and had at both ends 1- to 1.5-kb sequences in common with Y73-associated virus RNA. This structure is very similar to those of avian and mammalian leukemia viruses. In vitro translation of the 4.8-kb RNA and the immunospecificity of the products directly demonstrated that polyprotein p90, containing p19, is a product translated from capped 4.8-kb RNA and that the specific peptide portion is coded by the yas sequence. Protein 90, which was also found in cells transformed with Y73, was suggested to be a transforming protein.
mesh_terms: D001355:Alpharetrovirus / Q000235:genetics*; D000818:Animals; D001483:Base Sequence; D002471:Cell Transformation, Neoplastic; D002472:Cell Transformation, Viral; D002642:Chick Embryo; D003673:Defective Viruses / Q000235:genetics; D005814:Genes, Viral; D012367:RNA, Viral / Q000032:analysis / Q000235:genetics; D014764:Viral Proteins / Q000235:genetics*
chemical_list: D012367:RNA, Viral; D014764:Viral Proteins