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 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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

  • 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, p ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CALCIUM-BINDING PROTEIN 39
A, D
341Homo sapiensMutation(s): 0 
Gene Names: CAB39 (MO25)
Find proteins for Q9Y376 (Homo sapiens)
Go to Gene View: CAB39
Go to UniProtKB:  Q9Y376
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
STE20-RELATED KINASE ADAPTER PROTEIN ALPHA
B, E
373Homo sapiensMutation(s): 0 
Gene Names: STRADA (LYK5, STRAD)
Find proteins for Q7RTN6 (Homo sapiens)
Go to Gene View: STRADA
Go to UniProtKB:  Q7RTN6
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
SERINE/THREONINE-PROTEIN KINASE 11
C, F
305Homo sapiensMutation(s): 1 
Gene Names: STK11 (LKB1, PJS)
EC: 2.7.11.1
Find proteins for Q15831 (Homo sapiens)
Go to Gene View: STK11
Go to UniProtKB:  Q15831
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
ANP
Query on ANP

Download SDF File 
Download CCD File 
B, C, E, F
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
 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 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 118.360α = 90.00
b = 118.360β = 90.00
c = 390.012γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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