6BCU

Cryo-EM structure of the activated RHEB-mTORC1 refined to 3.4 angstrom


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Mechanisms of mTORC1 activation by RHEB and inhibition by PRAS40.

Yang, H.Jiang, X.Li, B.Yang, H.J.Miller, M.Yang, A.Dhar, A.Pavletich, N.P.

(2017) Nature 552: 368-373

  • DOI: 10.1038/nature25023
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The mechanistic target of rapamycin complex 1 (mTORC1) controls cell growth and metabolism in response to nutrients, energy levels, and growth factors. It contains the atypical kinase mTOR and the RAPTOR subunit that binds to the Tor signalling seque ...

    The mechanistic target of rapamycin complex 1 (mTORC1) controls cell growth and metabolism in response to nutrients, energy levels, and growth factors. It contains the atypical kinase mTOR and the RAPTOR subunit that binds to the Tor signalling sequence (TOS) motif of substrates and regulators. mTORC1 is activated by the small GTPase RHEB (Ras homologue enriched in brain) and inhibited by PRAS40. Here we present the 3.0 ångström cryo-electron microscopy structure of mTORC1 and the 3.4 ångström structure of activated RHEB-mTORC1. RHEB binds to mTOR distally from the kinase active site, yet causes a global conformational change that allosterically realigns active-site residues, accelerating catalysis. Cancer-associated hyperactivating mutations map to structural elements that maintain the inactive state, and we provide biochemical evidence that they mimic RHEB relieving auto-inhibition. We also present crystal structures of RAPTOR-TOS motif complexes that define the determinants of TOS recognition, of an mTOR FKBP12-rapamycin-binding (FRB) domain-substrate complex that establishes a second substrate-recruitment mechanism, and of a truncated mTOR-PRAS40 complex that reveals PRAS40 inhibits both substrate-recruitment sites. These findings help explain how mTORC1 selects its substrates, how its kinase activity is controlled, and how it is activated by cancer-associated mutations.


    Organizational Affiliation

    Howard Hughes Medical Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase mTOR,Serine/threonine-protein kinase mTORA, B2549Homo sapiensMutation(s): 0 
Gene Names: MTORFRAPFRAP1FRAP2RAFT1RAPT1
EC: 2.7.11.1
Find proteins for P42345 (Homo sapiens)
Explore P42345 
Go to UniProtKB:  P42345
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PHAROS  P42345
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Target of rapamycin complex subunit LST8D, E326Homo sapiensMutation(s): 0 
Gene Names: MLST8GBLLST8
Find proteins for Q9BVC4 (Homo sapiens)
Explore Q9BVC4 
Go to UniProtKB:  Q9BVC4
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PHAROS  Q9BVC4
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Regulatory-associated protein of mTOR,Regulatory-associated protein of mTORW, Y1343Homo sapiensMutation(s): 0 
Gene Names: RPTORKIAA1303RAPTOR
Find proteins for Q8N122 (Homo sapiens)
Explore Q8N122 
Go to UniProtKB:  Q8N122
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PHAROS  Q8N122
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  • Reference Sequence

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Eukaryotic translation initiation factor 4E-binding protein 1X, Z122Homo sapiensMutation(s): 0 
Gene Names: EIF4EBP1
Find proteins for Q13541 (Homo sapiens)
Explore Q13541 
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PHAROS  Q13541
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  • Reference Sequence

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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
GTP-binding protein RhebR, S188Homo sapiensMutation(s): 0 
Gene Names: RHEBRHEB2
Find proteins for Q15382 (Homo sapiens)
Explore Q15382 
Go to UniProtKB:  Q15382
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PHAROS  Q15382
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download CCD File 
R, S
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
ATP
Query on ATP

Download CCD File 
A, B
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A, B, R, S
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--

Revision History 

  • Version 1.0: 2017-12-20
    Type: Initial release
  • Version 1.1: 2018-01-17
    Changes: Author supporting evidence
  • Version 1.2: 2018-01-24
    Changes: Database references
  • Version 1.3: 2018-10-03
    Changes: Data collection, Refinement description
  • Version 1.4: 2019-11-20
    Changes: Author supporting evidence