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- EMDB-50253: cryo-EM structure of human LST2 bound to human mTOR complex 1 -

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Basic information

Entry
Database: EMDB / ID: EMD-50253
Titlecryo-EM structure of human LST2 bound to human mTOR complex 1
Map data
Sample
  • Complex: mTORC1 in complex with LST2
KeywordsMTOR / MTORC1 / LST2 / ZFYVE28 / EGFR / TOS / SIGNALING PROTEIN
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.02 Å
AuthorsCraigie LM / Maier T
Funding support Switzerland, European Union, 2 items
OrganizationGrant numberCountry
Swiss National Science Foundation179323 Switzerland
H2020 Marie Curie Actions of the European Commission812830European Union
CitationJournal: Proc Natl Acad Sci U S A / Year: 2024
Title: mTORC1 phosphorylates and stabilizes LST2 to negatively regulate EGFR.
Authors: Stefania Battaglioni / Louise-Marie Craigie / Sofia Filippini / Timm Maier / Michael N Hall /
Abstract: TORC1 (target of rapamycin complex 1) is a highly conserved protein kinase that plays a central role in regulating cell growth. Given the role of mammalian TORC1 (mTORC1) in metabolism and disease, ...TORC1 (target of rapamycin complex 1) is a highly conserved protein kinase that plays a central role in regulating cell growth. Given the role of mammalian TORC1 (mTORC1) in metabolism and disease, understanding mTORC1 downstream signaling and feedback loops is important. mTORC1 recognizes some of its substrates via a five amino acid binding sequence called the TOR signaling (TOS) motif. mTORC1 binding to a TOS motif facilitates phosphorylation of a distinct, distal site. Here, we show that LST2, also known as ZFYVE28, contains a TOS motif (amino acids 401 to 405) and is directly phosphorylated by mTORC1 at serine 670 (S670). mTORC1-mediated S670 phosphorylation promotes LST2 monoubiquitination on lysine 87 (K87). Monoubiquitinated LST2 is stable and displays a broad reticular distribution. When mTORC1 is inactive, unphosphorylated LST2 is degraded by the proteasome. The absence of LST2 enhances EGFR (epidermal growth factor receptor) signaling. We propose that mTORC1 negatively feeds back on its upstream receptor EGFR via LST2.
History
DepositionMay 7, 2024-
Header (metadata) releaseAug 14, 2024-
Map releaseAug 14, 2024-
UpdateAug 28, 2024-
Current statusAug 28, 2024Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_50253.png

Downloads & links

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Map

FileDownload / File: emd_50253.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.31 Å/pix.
x 512 pix.
= 670.72 Å		1.31 Å/pix.
x 512 pix.
= 670.72 Å		1.31 Å/pix.
x 512 pix.
= 670.72 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.31 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.15
Minimum - Maximum-0.23395512 - 0.7936923
Average (Standard dev.)0.00013632179 (±0.014168677)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 670.72 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_50253_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : mTORC1 in complex with LST2

EntireName: mTORC1 in complex with LST2
Components
  • Complex: mTORC1 in complex with LST2

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Supramolecule #1: mTORC1 in complex with LST2

SupramoleculeName: mTORC1 in complex with LST2 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration1 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 281 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Number grids imaged: 1 / Number real images: 4719 / Average electron dose: 43.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1057805
Startup modelType of model: OTHER / Details: CryoSPARC ab-initio reconstruction
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.02 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 272762
Initial angle assignmentType: RANDOM ASSIGNMENT / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

7peb


Chain - Source name: PDB / Chain - Initial model type: experimental model

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