Crystal Structure of the N-terminal Kinase Domain of Human RSK1 bound to Purvalnol A

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Work: 0.253 
  • R-Value Observed: 0.279 

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Crystal structures of the N-terminal kinase domain of human RSK1 bound to three different ligands: Implications for the design of RSK1 specific inhibitors.

Ikuta, M.Kornienko, M.Byrne, N.Reid, J.C.Mizuarai, S.Kotani, H.Munshi, S.K.

(2007) Protein Sci 16: 2626-2635

  • DOI: https://doi.org/10.1110/ps.073123707
  • Primary Citation of Related Structures:  
    2Z7Q, 2Z7R, 2Z7S

  • PubMed Abstract: 

    The p90 ribosomal S6 kinases (RSKs) also known as MAPKAP-Ks are serine/threonine protein kinases that are activated by ERK or PDK1 and act as downstream effectors of mitogen-activated protein kinase (MAPK). RSK1, a member of the RSK family, contains two distinct kinase domains in a single polypeptide chain, the regulatory C-terminal kinase domain (CTKD) and the catalytic N-terminal kinase domain (NTKD). Autophosphorylation of the CTKD leads to activation of the NTKD that subsequently phosphorylates downstream substrates. Here we report the crystal structures of the unactivated RSK1 NTKD bound to different ligands at 2.0 A resolution. The activation loop and helix alphaC, key regulatory elements of kinase function, are disordered. The DFG motif of the inactive RSK1 adopts an "active-like" conformation. The beta-PO(4) group in the AMP-PCP complex adopts a unique conformation that may contribute to inactivity of the enzyme. Structures of RSK1 ligand complexes offer insights into the design of novel anticancer agents and into the regulation of the catalytic activity of RSKs.

  • Organizational Affiliation

    Department of Structural Biology, Merck Research Laboratories, West Point, Pennsylvania 19486, USA. mari_ikuta@.merck.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribosomal protein S6 kinase alpha-1321Homo sapiensMutation(s): 0 
Gene Names: RPS6KA1RSK1
UniProt & NIH Common Fund Data Resources
Find proteins for Q15418 (Homo sapiens)
Explore Q15418 
Go to UniProtKB:  Q15418
PHAROS:  Q15418
GTEx:  ENSG00000117676 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15418
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on P01

Download Ideal Coordinates CCD File 
C19 H25 Cl N6 O
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Work: 0.253 
  • R-Value Observed: 0.279 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.641α = 90
b = 52.996β = 90
c = 119.304γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-05-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description