3G51

Structural diversity of the active conformation of the N-terminal kinase domain of p90 ribosomal S6 kinase 2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.216 

Starting Model: experimental
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Literature

Structural diversity of the active N-terminal kinase domain of p90 ribosomal S6 kinase 2

Malakhova, M.Kurinov, I.Liu, K.Zheng, D.D'Angelo, I.Shim, J.H.Steinman, V.Bode, A.M.Dong, Z.

(2009) PLoS One 4: e8044-e8044

  • DOI: https://doi.org/10.1371/journal.pone.0008044
  • Primary Citation of Related Structures:  
    3G51

  • PubMed Abstract: 

    The p90 ribosomal protein kinase 2 (RSK2) is a highly expressed Ser/Thr kinase activated by growth factors and is involved in cancer cell proliferation and tumor promoter-induced cell transformation. RSK2 possesses two non-identical kinase domains, and the structure of its N-terminal domain (NTD), which is responsible for phosphorylation of a variety of substrates, is unknown. The crystal structure of the NTD RSK2 was determined at 1.8 A resolution in complex with AMP-PNP. The N-terminal kinase domain adopted a unique active conformation showing a significant structural diversity of the kinase domain compared to other kinases. The NTD RSK2 possesses a three-stranded betaB-sheet inserted in the N-terminal lobe, resulting in displacement of the alphaC-helix and disruption of the Lys-Glu interaction, classifying the kinase conformation as inactive. The purified protein was phosphorylated at Ser227 in the T-activation loop and exhibited in vitro kinase activity. A key characteristic is the appearance of a new contact between Lys216 (betaB-sheet) and the beta-phosphate of AMP-PNP. Mutation of this lysine to alanine impaired both NTDs in vitro and full length RSK2 ex vivo activity, emphasizing the importance of this interaction. Even though the N-terminal lobe undergoes structural re-arrangement, it possesses an intact hydrophobic groove formed between the alphaC-helix, the beta4-strand, and the betaB-sheet junction, which is occupied by the N-terminal tail. The presence of a unique betaB-sheet insert in the N-lobe suggests a different type of activation mechanism for RSK2.


  • Organizational Affiliation

    Department of Cellular and Molecular Biology, The Hormel Institute, University of Minnesota, Austin, Minnesota, United States of America.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribosomal protein S6 kinase alpha-3325Mus musculusMutation(s): 0 
Gene Names: Mus musculus ribosomal protein S6 kinase 2Rps6ka-rs1Rps6ka3Rsk2
EC: 2.7.11.1
UniProt
Find proteins for P18654 (Mus musculus)
Explore P18654 
Go to UniProtKB:  P18654
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP18654
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ANP
Query on ANP

Download Ideal Coordinates CCD File 
B [auth A]PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.167α = 90
b = 51.381β = 90
c = 140.873γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

  • Released Date: 2009-12-15 
  • Deposition Author(s): Kurinov, I.

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description