Abstract
The RET/PTC3 oncogene arises from the fusion between the N-terminal encoding domain of the RFG gene and the tyrosine kinase encoding domain of RET receptor. RET/PTC3 is very frequent in papillary thyroid carcinomas, especially in children exposed to the Chernobyl accident. We have studied the functional consequences of the RFG–RET fusion. Here we show that the N-terminal coiled-coil domain of RGF mediates oligomerization and activation of the kinase and of the transforming capability of RET/PTC3. In addition, the RFG coiled-coil domain mediates a physical association between RET/PTC3 and RGF proteins, rendering RFG a bona fide substrate of RET/PTC3 kinase. Finally, we show that the coiled-coil domain of RGF is essential for the distribution of the RET/PTC3 protein at the membrane/particulate cell compartment level, where also most of the RFG protein is localized. We propose that fusion to the RFG coiled-coil domain provides RET kinase with a scaffold that mediates oligomerization and re-localization of the RET/PTC3 protein, a process that may be crucial for the signalling of this specific RET/PTC variant.
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Acknowledgements
We are grateful to O Segatto for the 293T cells, S Gutkind for the pCEFL-HA vector, and PP Di Fiore for the anti-eps15 antibody. We thank F Carlomagno for the two-hybrid assay and critical reading of the manuscript, F Sferratore for technical assistance and Jean Ann Gilder for editing the text. This study was supported by the Associazione Italiana per la Ricerca sul Cancro (AIRC), by EC grants BMH4-CT96-0814 and FIS5 1999 00032 and by the Progetto Biotecnologie ‘5%’ of the Consiglio Nazionale delle Ricerche (CNR). MV Barone and GM Pierantoni were recipients of fellowships of the Italian Foundation for Cancer Research (FIRC). The paper was written while G Vecchio was a Scholar-in-Residence at the Fogarty International Center for Advanced Study in the Health Sciences, National Institutes of Health, Bethesda.
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Monaco, C., Visconti, R., Barone, M. et al. The RFG oligomerization domain mediates kinase activation and re-localization of the RET/PTC3 oncoprotein to the plasma membrane. Oncogene 20, 599–608 (2001). https://doi.org/10.1038/sj.onc.1204127
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DOI: https://doi.org/10.1038/sj.onc.1204127
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