6G76

Phosphorylated RSK4 N-terminal Kinase Domain in complex with AMP-PNP

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.226 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history. 


Literature

Repurposed floxacins targeting RSK4 prevent chemoresistance and metastasis in lung and bladder cancer.

Chrysostomou, S., Roy, R., Prischi, F., Thamlikitkul, L., Chapman, K.L., Mufti, U., Peach, R., Ding, L., Hancock, D., Moore, C., Molina-Arcas, M., Mauri, F., Pinato, D.J., Abrahams, J.M., Ottaviani, S., Castellano, L., Giamas, G., Pascoe, J., Moonamale, D., Pirrie, S., Gaunt, C., Billingham, L., Steven, N.M., Cullen, M., Hrouda, D., Winkler, M., Post, J., Cohen, P., Salpeter, S.J., Bar, V., Zundelevich, A., Golan, S., Leibovici, D., Lara, R., Klug, D.R., Yaliraki, S.N., Barahona, M., Wang, Y., Downward, J., Skehel, J.M., Ali, M.M.U., Seckl, M.J., Pardo, O.E.

(2021) Sci Transl Med 13

  • DOI: 10.1126/scitranslmed.aba4627
  • Primary Citation of Related Structures:  
    6G76, 6G77, 6G78

  • PubMed Abstract: 

    • Lung and bladder cancers are mostly incurable because of the early development of drug resistance and metastatic dissemination. Hence, improved therapies that tackle these two processes are urgently needed to improve clinical outcome. We have identified RSK4 as a promoter of drug resistance and metastasis in lung and bladder cancer cells ...

    Lung and bladder cancers are mostly incurable because of the early development of drug resistance and metastatic dissemination. Hence, improved therapies that tackle these two processes are urgently needed to improve clinical outcome. We have identified RSK4 as a promoter of drug resistance and metastasis in lung and bladder cancer cells. Silencing this kinase, through either RNA interference or CRISPR, sensitized tumor cells to chemotherapy and hindered metastasis in vitro and in vivo in a tail vein injection model. Drug screening revealed several floxacin antibiotics as potent RSK4 activation inhibitors, and trovafloxacin reproduced all effects of RSK4 silencing in vitro and in/ex vivo using lung cancer xenograft and genetically engineered mouse models and bladder tumor explants. Through x-ray structure determination and Markov transient and Deuterium exchange analyses, we identified the allosteric binding site and revealed how this compound blocks RSK4 kinase activation through binding to an allosteric site and mimicking a kinase autoinhibitory mechanism involving the RSK4's hydrophobic motif. Last, we show that patients undergoing chemotherapy and adhering to prophylactic levofloxacin in the large placebo-controlled randomized phase 3 SIGNIFICANT trial had significantly increased ( P = 0.048) long-term overall survival times. Hence, we suggest that RSK4 inhibition may represent an effective therapeutic strategy for treating lung and bladder cancer.

    Organizational Affiliation: 

    Division of Cancer, Department of Surgery and Cancer, Imperial College London, London SW7 2AZ, UK. maruf.ali@imperial.ac.uk m.seckl@imperial.ac.uk o.pardo@imperial.ac.uk.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ribosomal protein S6 kinase alpha-6A, B307Homo sapiensMutation(s): 0 
Gene Names: RPS6KA6, RSK4
EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UK32 (Homo sapiens)
Explore Q9UK32 
Go to UniProtKB:  Q9UK32
PHAROS:  Q9UK32
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UK32
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ANP
Query on ANP
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
F [auth B]		PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N		 Ligand Interaction
ZN
Query on ZN
Download Ideal Coordinates CCD File 
E [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP		A, B L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.226 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.489α = 90
b = 52.331β = 90
c = 115.505γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Cancer Research UKUnited KingdomC33269/A11161

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-17
    Type: Initial release
  • Version 1.1: 2021-07-28
    Changes: Database references
  • Version 1.2: 2021-08-11
    Changes: Database references