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Interaction of folliculin (Birt-Hogg-Dubé gene product) with a novel Fnip1-like (FnipL/Fnip2) protein

Abstract

Birt-Hogg-Dubé (BHD) syndrome is characterized by the development of pneumothorax, hair folliculomas and renal tumors and the responsible BHD gene is thought to be a tumor suppressor. The function of folliculin (Flcn), encoded by BHD, is totally unknown, although its interaction with Fnip1 has been reported. In this study, we identified a novel protein binding to Flcn, which is highly homologous to Fnip1, and which we named FnipL (recently reported in an independent study as Fnip2). The interaction between FnipL/Fnip2 and Flcn may be mediated mainly by the C-terminal domains of each protein as is the case for the Flcn-Fnip1 interaction. FnipL/Fnip2 and Flcn were located together in the cytoplasm in a reticular pattern, although solely expressed Flcn was found mainly in the nucleus. Cytoplasmic retention of Flcn was canceled with C-terminal truncation of FnipL/Fnip2, suggesting that FnipL/Fnip2 regulates Flcn distribution through their complex formation. By the employment of siRNA, we observed a decrease in S6K1 phosphorylation in the BHD-suppressed cell. We also observed a decrease in S6K1 phosphorylation in FNIP1- and, to a lesser extent, in FNIPL/FNIP2-suppressed cells. These results suggest that Flcn-FnipL/Fnip2 and Flcn-Fnip1 complexes positively regulate S6K1 phosphorylation and that FnipL/Fnip2 provides an important clue to elucidating the function of Flcn and the pathogenesis of BHD.

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Acknowledgements

We thank Drs Fujii H, Tsurui H, Matsuoka S, Wakiya M, Kajino K, Mr Sasahara K and Mr Takagaki T in the Department of Pathology and Oncology for helpful discussions and technical supports. We also thank Ms Ochiai K and Mr Matsunami K in the Division of Radioisotope Research for expert support. We appreciate Dr Maeda M (IBL) for production of antibodies, and Drs Okimoto K, Matsumoto I and Kouchi M (Dainippon-Sumitomo Pharma) and Dr Maeda T (Tokyo University) for helpful discussions. We also thank Kazusa DNA Research Institute for cDNA clones. This study was supported by the grants from the Japan Society for the Promotion of Science (JSPS), from the Ministry of Education, Culture, Sports and Technology of Japan, and from the Ministry of Health, Labour and Welfare of Japan.

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Correspondence to O Hino.

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Takagi, Y., Kobayashi, T., Shiono, M. et al. Interaction of folliculin (Birt-Hogg-Dubé gene product) with a novel Fnip1-like (FnipL/Fnip2) protein. Oncogene 27, 5339–5347 (2008). https://doi.org/10.1038/onc.2008.261

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