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We determined the biological activities of the 44-amino-acid deer papillomavirus (DPV) E5 protein in mouse C127 cells. The DPV E5 gene can induce focus formation, stable and acute morphologic transformation, and DNA synthesis, and it activates the platelet-derived growth factor (PDGF) beta receptor as assessed by increased constitutive tyrosine phosphorylation of mature and precursor receptor forms. Thus, the DPV E5 protein has biological activities similar to those of the closely related E5 protein from bovine papillomavirus type 1. Moreover, like the bovine papillomavirus type 1 E5 protein, the DPV E5 protein shares a short region of sequence similarity with the B chain of PDGF. These results show that activation of the PDGF receptor is a general property of fibropapillomavirus E5 proteins, lending support to our previous proposal (L. Petti, L. Nilson, and D. DiMaio, EMBO J. 10:845-855, 1991) that activation of the PDGF receptor may play a central role in transformation of fibroblasts by E5 proteins.

journal of virology

Biological properties of the deer papillomavirus E5 gene in mouse C127 cells: growth transformation, induction of DNA synthesis, and activation of the platelet-derived growth factor receptor