Molecular cloning and characterization of avian sarcoma virus UR2 and comparison of its transforming sequence with those of other avian sarcoma viruses (original) (raw)

Abstract

Avian sarcoma virus UR2 and its associated helper virus, UR2AV , were molecularly cloned into lambda gtWES X lambda B by using unintegrated viral DNAs. One UR2 and several UR2AV clones were obtained. The UR2 DNA was subsequently cloned into pBR322. Both UR2 and UR2AV DNAs were tested for their biological activity by transfection onto chicken embryo fibroblasts. When cotransfected with UR2AV DNA, UR2 DNA was able to induce transformation of chicken embryo fibroblasts with a morphology similar to that of parental UR2 . UR2 -specific protein with kinase activity and UR2 -specific RNA were detected in the transfected cells. Transforming virus, UR2 ( UR2AV ), was produced from the doubly transfected cells. Five of the six UR2AV clones tested were also shown to be biologically active. The insert of the UR2 DNA clone is 3.4 kilobases in length and contains two copies of the long terminal repeat. Detailed restriction mapping showed that UR2 DNA shared with UR2AV DNA 0.8 kilobases of 5' sequence, including a portion of 5' gag, and 1.4 kilobases of 3' sequence, including a portion of 3' env. The UR2 transforming sequence, ros, is ca. 1.2 kilobases. No significant homology was found between v-ros and the conserved regions of v-src, v-yes, or v- abl . By contrast, a significant homology was found between v-ros and v-fps. The v-fps-related sequence was mapped within a 300-base-pair sequence in the middle of ros.

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Selected References

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