Lst4, the yeast Fnip1/2 orthologue is a DENN-family protein
Wong, Louise H
Blaszczyk, Beata K
Nookala, Ravi K
Levine, Tim P
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Pacitto, A., Ascher, D., Wong, L. H., Blaszczyk, B. K., Nookala, R. K., Zhang, N., Dokudovskaya, S., et al. (2015). Lst4, the yeast Fnip1/2 orthologue is a DENN-family protein. Open Biology, 5 (150174)https://doi.org/10.1098/rsob.150174
The folliculin/fnip complex has been demonstrated to play a crucial role in the mechanisms underlying Birt-Hogg-Dubé syndrome, a rare inherited cancer syndrome. Lst4 has been previously proposed to be the Fnip1/2 orthologue in yeast and therefore a member of the DENN-family. In order to confirm this, we solved the crystal structure of the N-terminal region of Lst4 from K. lactis and show it contains a longin domain, the first domain of the full DENN module. Furthermore, we demonstrate that Lst4 through its DENN domain interacts with Lst7, the yeast folliculin orthologue. Like its human counterpart, the Lst7/Lst4 complex relocates to the vacuolar membrane in response to nutrient starvation, most notably in carbon starvation. Finally we express and purify the recombinant Lst7/Lst4 complex and show that it exists as a 1:1 heterodimer in solution. This work confirms the membership of Lst4 and the Fnip proteins in the DENN family, and provides a basis for using the Lst7/Lst4 complex to understand the molecular function of folliculin and its role in the pathogenesis of BHD syndrome.
Lst4, DENN-family, BHD syndrome, Lst7, Fnip1/2, Folliculin
AP, BKB and RKN were supported by the Myrovlytis Trust. DBA was supported by a NHMRC CJ Martin Fellowship (APP1072476). LHW was supported by Medical Research Council (MRC) studentship, MR/J006580/1 and TPL by University College London. SD was supported by Fondation de France, La Ligue National contre le Cancer (Comité de Paris / Ile-de-France and Comité de l’Oise); TLB and NZ thank the University of Cambridge and The Wellcome Trust for facilities and support.
External DOI: https://doi.org/10.1098/rsob.150174
This record's URL: https://www.repository.cam.ac.uk/handle/1810/252532
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