Journal: Science / Year: 2016 Title: Architecture of human mTOR complex 1. Authors: Christopher H S Aylett / Evelyn Sauer / Stefan Imseng / Daniel Boehringer / Michael N Hall / Nenad Ban / Timm Maier / Abstract: Target of rapamycin (TOR), a conserved protein kinase and central controller of cell growth, functions in two structurally and functionally distinct complexes: TORC1 and TORC2. Dysregulation of ...Target of rapamycin (TOR), a conserved protein kinase and central controller of cell growth, functions in two structurally and functionally distinct complexes: TORC1 and TORC2. Dysregulation of mammalian TOR (mTOR) signaling is implicated in pathologies that include diabetes, cancer, and neurodegeneration. We resolved the architecture of human mTORC1 (mTOR with subunits Raptor and mLST8) bound to FK506 binding protein (FKBP)-rapamycin, by combining cryo-electron microscopy at 5.9 angstrom resolution with crystallographic studies of Chaetomium thermophilum Raptor at 4.3 angstrom resolution. The structure explains how FKBP-rapamycin and architectural elements of mTORC1 limit access to the recessed active site. Consistent with a role in substrate recognition and delivery, the conserved amino-terminal domain of Raptor is juxtaposed to the kinase active site.
History
Deposition
Oct 23, 2015
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Header (metadata) release
Nov 11, 2015
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Map release
Dec 30, 2015
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Update
Jan 13, 2016
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Current status
Jan 13, 2016
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
UniProtKB: Target of rapamycin complex subunit LST8
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Experimental details
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Structure determination
Method
cryo EM
Processing
single particle reconstruction
Aggregation state
particle
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Sample preparation
Buffer
pH: 8 / Details: 100 mM NaCl, 10 mM NaBicine, 1 mM TCEP
Grid
Details: Quantifoil R2/2 with an additional thin carbon layer
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 120 K / Instrument: FEI VITROBOT MARK I / Method: 4 second blotting
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Electron microscopy
Microscope
FEI TITAN KRIOS
Temperature
Average: 100 K
Alignment procedure
Legacy - Astigmatism: Objective lens astigmatism was corrected at 150,000 times magnification
Date
May 5, 2015
Image recording
Category: CCD / Film or detector model: FEI FALCON II (4k x 4k) / Number real images: 6299 / Average electron dose: 25 e/Å2 Details: Single movie frame readout. 7 frames per exposure. Drift corrected in post-processing. 4 images per hole. Bits/pixel: 16
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Poor quality micrographs were rejected by eye, based on the extent and regularity of the Thon rings observed in the contrast transfer function. Estimation of the contrast transfer function was carried out for each image using CTFFIND3, particles were selected semi-automatically using boxer and batchboxer.
CTF correction
Details: Each image
Final reconstruction
Applied symmetry - Point group: C2 (2 fold cyclic) / Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 6.1 Å / Resolution method: OTHER / Software - Name: CTFFIND3, RELION, 1.3 Details: For full details see the supplemental materials and methods in the accompanying publication which provides processing details and the classification schema. Number images used: 309792
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