2WTK

Structure of the heterotrimeric LKB1-STRADalpha-MO25alpha complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.240 

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Literature

Structure of the Lkb1-Strad-Mo25 Complex Reveals an Allosteric Mechanism of Kinase Activation.

Zeqiraj, E., Filippi, B.M., Deak, M., Alessi, D.R., Van Aalten, D.M.F.

(2009) Science 326: 1707

  • DOI: 10.1126/science.1178377
  • Primary Citation of Related Structures:  
    2WTK

  • PubMed Abstract: 

    • The LKB1 tumor suppressor is a protein kinase that controls the activity of adenosine monophosphate-activated protein kinase (AMPK). LKB1 activity is regulated by the pseudokinase STRADalpha and the scaffolding protein MO25alpha through an unknown, phosphorylation-independent, mechanism ...

    The LKB1 tumor suppressor is a protein kinase that controls the activity of adenosine monophosphate-activated protein kinase (AMPK). LKB1 activity is regulated by the pseudokinase STRADalpha and the scaffolding protein MO25alpha through an unknown, phosphorylation-independent, mechanism. We describe the structure of the core heterotrimeric LKB1-STRADalpha-MO25alpha complex, revealing an unusual allosteric mechanism of LKB1 activation. STRADalpha adopts a closed conformation typical of active protein kinases and binds LKB1 as a pseudosubstrate. STRADalpha and MO25alpha promote the active conformation of LKB1, which is stabilized by MO25alpha interacting with the LKB1 activation loop. This previously undescribed mechanism of kinase activation may be relevant to understanding the evolution of other pseudokinases. The structure also reveals how mutations found in Peutz-Jeghers syndrome and in various sporadic cancers impair LKB1 function.

    Organizational Affiliation: 

    Division of Molecular Microbiology, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CALCIUM-BINDING PROTEIN 39A, D341Homo sapiensMutation(s): 0 
Gene Names: CAB39, MO25, CGI-66
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y376 (Homo sapiens)
Explore Q9Y376 
Go to UniProtKB:  Q9Y376
PHAROS:  Q9Y376
GTEx:  ENSG00000135932 
Entity Groups  
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UniProt GroupQ9Y376
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
STE20-RELATED KINASE ADAPTER PROTEIN ALPHAB, E373Homo sapiensMutation(s): 0 
Gene Names: STRADA, LYK5, STRAD
UniProt & NIH Common Fund Data Resources
Find proteins for Q7RTN6 (Homo sapiens)
Explore Q7RTN6 
Go to UniProtKB:  Q7RTN6
PHAROS:  Q7RTN6
GTEx:  ENSG00000266173 
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UniProt GroupQ7RTN6
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
SERINE/THREONINE-PROTEIN KINASE 11C, F305Homo sapiensMutation(s): 1 
Gene Names: STK11, LKB1, PJS
EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q15831 (Homo sapiens)
Explore Q15831 
Go to UniProtKB:  Q15831
PHAROS:  Q15831
GTEx:  ENSG00000118046 
Entity Groups  
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UniProt GroupQ15831
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Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ANP
Query on ANP
Download Ideal Coordinates CCD File 
G [auth B],
H [auth C],
J [auth E],
K [auth F]		PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
I [auth D]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.240 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.36α = 90
b = 118.36β = 90
c = 390.012γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2011-11-02
    Changes: Database references, Refinement description