Human p70s6k1 with ruthenium-based inhibitor FL772

Experimental Data Snapshot

  • Resolution: 2.79 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 

Starting Model: experimental
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Development of Organometallic S6K1 Inhibitors.

Qin, J.Rajaratnam, R.Feng, L.Salami, J.Barber-Rotenberg, J.S.Domsic, J.Reyes-Uribe, P.Liu, H.Dang, W.Berger, S.L.Villanueva, J.Meggers, E.Marmorstein, R.

(2015) J Med Chem 58: 305-314

  • DOI: https://doi.org/10.1021/jm5011868
  • Primary Citation of Related Structures:  
    4RLO, 4RLP

  • PubMed Abstract: 

    Aberrant activation of S6 kinase 1 (S6K1) is found in many diseases, including diabetes, aging, and cancer. We developed ATP competitive organometallic kinase inhibitors, EM5 and FL772, which are inspired by the structure of the pan-kinase inhibitor staurosporine, to specifically inhibit S6K1 using a strategy previously used to target other kinases. Biochemical data demonstrate that EM5 and FL772 inhibit the kinase with IC50 value in the low nanomolar range at 100 μM ATP and that the more potent FL772 compound has a greater than 100-fold specificity over S6K2. The crystal structures of S6K1 bound to staurosporine, EM5, and FL772 reveal that the EM5 and FL772 inhibitors bind in the ATP binding pocket and make S6K1-specific contacts, resulting in changes to the p-loop, αC helix, and αD helix when compared to the staurosporine-bound structure. Cellular data reveal that FL772 is able to inhibit S6K phosphorylation in yeast cells. Together, these studies demonstrate that potent, selective, and cell permeable S6K1 inhibitors can be prepared and provide a scaffold for future development of S6K inhibitors with possible therapeutic applications.

  • Organizational Affiliation

    The Wistar Institute , 3601 Spruce Street, Philadelphia, Pennsylvania 19104, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
p70S6K1288Homo sapiensMutation(s): 0 
Gene Names: RPS6KB1STK14A
UniProt & NIH Common Fund Data Resources
Find proteins for P23443 (Homo sapiens)
Explore P23443 
Go to UniProtKB:  P23443
GTEx:  ENSG00000108443 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23443
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.79 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.13α = 90
b = 126.371β = 90
c = 110.571γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-21
    Type: Initial release
  • Version 1.1: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary