EMD-0556

Single-particle
8.1 Å
EMD-0556 Deposition: 13/02/2019
Map released: 06/11/2019
Last modified: 04/12/2019
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links

EMD-0556

Cryo-EM Map of the active Ragulator-RagA-RagC Complex

EMD-0556

Single-particle
8.1 Å
EMD-0556 Deposition: 13/02/2019
Map released: 06/11/2019
Last modified: 04/12/2019
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Sample Organism: Homo sapiens
Sample: active RagA-RagC-Ragulator Complex

Deposition Authors: Yokom AL, Fromm SA, Hurley JH
Structural mechanism of a Rag GTPase activation checkpoint by the lysosomal folliculin complex.
Lawrence RE , Fromm SA , Fu Y , Yokom AL , Kim DJ, Thelen AM , Young LN , Lim CY , Samelson AJ , Hurley JH , Zoncu R
(2019) Science , 366 , 971 - 977
PUBMED: 31672913
DOI: doi:10.1126/science.aax0364
ISSN: 1095-9203
ASTM: SCIEAS
Abstract:
The tumor suppressor folliculin (FLCN) enables nutrient-dependent activation of the mechanistic target of rapamycin complex 1 (mTORC1) protein kinase via its guanosine triphosphatase (GTPase) activating protein (GAP) activity toward the GTPase RagC. Concomitant with mTORC1 inactivation by starvation, FLCN relocalizes from the cytosol to lysosomes. To determine the lysosomal function of FLCN, we reconstituted the human lysosomal FLCN complex (LFC) containing FLCN, its partner FLCN-interacting protein 2 (FNIP2), and the RagAGDP:RagCGTP GTPases as they exist in the starved state with their lysosomal anchor Ragulator complex and determined its cryo-electron microscopy structure to 3.6 angstroms. The RagC-GAP activity of FLCN was inhibited within the LFC, owing to displacement of a catalytically required arginine in FLCN from the RagC nucleotide. Disassembly of the LFC and release of the RagC-GAP activity of FLCN enabled mTORC1-dependent regulation of the master regulator of lysosomal biogenesis, transcription factor E3, implicating the LFC as a checkpoint in mTORC1 signaling.