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We have isolated mutants of Rous sarcoma virus from an unmutagenized stock of the Schmidt-Ruppin strain of Rous sarcoma virus. These mutants induce only a "partial" transformation, and the transformation properties induced show unusual properties or combinations. Cells infected with mutant CU2 have a unique "blebby" morphology, have lost surface fibronectin, form very small colonies in soft agar, and are nearly normal with respect to adhesiveness and hexose transport. Cells infected with mutant tsCU11 have a nearly normal morphology, but grow well in soft agar. Cells infected with mutant CU12 have a fusiform morphology, intermediate levels of hexose transport and fibronectin, and form very large colonies in soft agar. Because the appearance of the different parameters of transformation is dissociated in these mutant-infected cells, these data are interpreted as supporting a model in which the transforming protein pp60src interacts with more than one primary target in generating the transformed phenotype. All of the mutants display levels of pp60src kinase activity less than that of the wild type. In the case of mutant CU12, the lower kinase activity is in part a consequence of a lower steady-state amount of pp60src inside the cell.

Biological properties of "partial" transformation mutants of Rous sarcoma virus and characterization of their pp60src kinase