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. 1994 Jun;68(6):3582–3592. doi: 10.1128/jvi.68.6.3582-3592.1994

Specific interaction between the bovine papillomavirus E5 transforming protein and the beta receptor for platelet-derived growth factor in stably transformed and acutely transfected cells.

L Petti 1, D DiMaio 1
PMCID: PMC236862  PMID: 8189497

Abstract

The E5 protein of bovine papillomavirus is a 44-amino-acid membrane protein which induces morphologic and tumorigenic transformation of fibroblasts. We previously showed that the E5 protein activates and forms a complex with the endogenous beta receptor for platelet-derived growth factor (PDGF) in transformed rodent fibroblasts and that the PDGF beta receptor can mediate tumorigenic transformation by the E5 protein in a heterologous cell system. Other workers have identified the receptor for epidermal growth factor (EGF) as a potential target of the E5 protein in NIH 3T3 cells. Here, we investigate the specificity of the interaction of the E5 protein with various growth factor receptors, with particular emphasis on the PDGF beta receptor and the EGF receptor. Under conditions where both the PDGF beta receptor and the EGF receptor are stably expressed in E5-transformed mouse and bovine fibroblasts and in E5-transformed epithelial cells, the E5 protein specifically forms a complex with and activates the PDGF receptor and not the EGF receptor. Under conditions of transient overexpression in COS cells, the E5 protein has the potential to associate with several growth factor receptors, including the EGF receptor. However, upon coexpression of PDGF beta receptors and EGF receptors in COS cells, the E5 protein preferentially forms a complex with the PDGF receptor. Therefore, we conclude that the PDGF beta receptor is the primary target for the E5 protein in a variety of cell types, including bovine fibroblasts.

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Selected References

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