Download MendeleyStructural basis for FLCN RagC GAP activation in MiT-TFE substrate-selective mTORC1 regulation.
Jansen, R.M., Peruzzo, R., Fromm, S.A., Yokom, A.L., Zoncu, R., Hurley, J.H.(2022) Sci Adv 8: eadd2926-eadd2926
- PubMed: 36103527
- DOI: https://doi.org/10.1126/sciadv.add2926
- Primary Citation of Related Structures:
8DHB - PubMed Abstract:
The mechanistic target of rapamycin complex 1 (mTORC1) regulates cell growth and catabolism in response to nutrients through phosphorylation of key substrates. The tumor suppressor folliculin (FLCN) is a RagC/D guanosine triphosphatase (GTPase)-activating protein (GAP) that regulates mTORC1 phosphorylation of MiT-TFE transcription factors, controlling lysosome biogenesis and autophagy. We determined the cryo-electron microscopy structure of the active FLCN complex (AFC) containing FLCN, FNIP2, the N-terminal tail of SLC38A9, the RagA GDP :RagC GDP.BeFx- GTPase dimer, and the Ragulator scaffold. Relative to the inactive lysosomal FLCN complex structure, FLCN reorients by 90°, breaks contact with RagA, and makes previously unseen contacts with RagC that position its Arg 164 finger for catalysis. Disruption of the AFC-specific interfaces of FLCN and FNIP2 with RagC eliminated GAP activity and led to nuclear retention of TFE3, with no effect on mTORC1 substrates S6K or 4E-BP1. The structure provides a basis for regulation of an mTORC1 substrate-specific pathway and a roadmap to discover MiT-TFE family selective mTORC1 antagonists.
Organizational Affiliation:
Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
