6YTA

CLK1 bound with imidazopyridazine (Cpd 1)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.194 

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Ligand Structure Quality Assessment 


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Literature

DFG-1 Residue Controls Inhibitor Binding Mode and Affinity, Providing a Basis for Rational Design of Kinase Inhibitor Selectivity.

Schroder, M., Bullock, A.N., Fedorov, O., Bracher, F., Chaikuad, A., Knapp, S.

(2020) J Med Chem 63: 10224-10234

  • DOI: 10.1021/acs.jmedchem.0c00898
  • Primary Citation of Related Structures:  
    6YTA, 6YTD, 6YTE, 6YTG, 6YTI, 6YTW, 6YTY, 6YU1, 6Z2V, 6ZLN

  • PubMed Abstract: 

    • Selectivity remains a challenge for ATP-mimetic kinase inhibitors, an issue that may be overcome by targeting unique residues or binding pockets. However, to date only few strategies have been developed. Here we identify that bulky residues located N-terminal to the DFG motif (DFG-1) represent an opportunity for designing highly selective inhibitors with unexpected binding modes ...

    Selectivity remains a challenge for ATP-mimetic kinase inhibitors, an issue that may be overcome by targeting unique residues or binding pockets. However, to date only few strategies have been developed. Here we identify that bulky residues located N-terminal to the DFG motif (DFG-1) represent an opportunity for designing highly selective inhibitors with unexpected binding modes. We demonstrate that several diverse inhibitors exerted selective, noncanonical binding modes that exclusively target large hydrophobic DFG-1 residues present in many kinases including PIM, CK1, DAPK, and CLK. By use of the CLK family as a model, structural and biochemical data revealed that the DFG-1 valine controlled a noncanonical binding mode in CLK1, providing a rationale for selectivity over the closely related CLK3 which harbors a smaller DFG-1 alanine. Our data suggest that targeting the restricted back pocket in the small fraction of kinases that harbor bulky DFG-1 residues offers a versatile selectivity filter for inhibitor design.

    Organizational Affiliation: 

    German Translational Cancer Network (DKTK), Frankfurt/Mainz Site, 60438 Frankfurt, Germany.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Dual specificity protein kinase CLK1A339Homo sapiensMutation(s): 0 
Gene Names: CLK1, CLK
EC: 2.7.12.1
UniProt & NIH Common Fund Data Resources
Find proteins for P49759 (Homo sapiens)
Explore P49759 
Go to UniProtKB:  P49759
PHAROS:  P49759
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49759
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IYZ (Subject of Investigation/LOI)
Query on IYZ
Download Ideal Coordinates CCD File 
C [auth A]1-(3-{6-[(CYCLOPROPYLMETHYL)AMINO]IMIDAZO[1,2-B]PYRIDAZIN-3-YL}PHENYL)ETHANONE
C18 H18 N4 O
IVUBNTNWKIPCPS-UHFFFAOYSA-N		 Ligand Interaction
EDO
Query on EDO
Download Ideal Coordinates CCD File 
B [auth A]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
IYZ Binding MOAD:  6YTA Ki: 229 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.194 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.378α = 90
b = 64.56β = 117.55
c = 72.519γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-15
    Type: Initial release
  • Version 1.1: 2020-10-14
    Changes: Database references