4CFV

Structure-based design of C8-substituted O6-cyclohexylmethoxyguanine CDK1 and 2 inhibitors.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

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Ligand Structure Quality Assessment 


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Literature

8-Substituted O6-Cyclohexylmethylguanine Cdk2 Inhibitors; Using Structure-Based Inhibitor Design to Optimise an Alternative Binding Mode.

Carbain, B., Paterson, D.J., Anscombe, E., Campbell-Dexter, A., Cano, C., Echalier, A., Endicott, J., Golding, B.T., Haggerty, K., Hardcastle, I.R., Jewsbury, P.J., Newell, D.R., Noble, M., Roche, C., Wang, L., Griffin, R.J.

(2014) J Med Chem 57: 56

  • DOI: 10.1021/jm401555v
  • Primary Citation of Related Structures:  
    1W8C, 4CFM, 4CFN, 4CFU, 4CFV, 4CFW, 4CFX

  • PubMed Abstract: 

    • Evaluation of the effects of purine C-8 substitution within a series of CDK1/2-selective O(6)-cyclohexylmethylguanine derivatives revealed that potency decreases initially with increasing size of the alkyl substituent. Structural analysis showed that C-8 substitution is poorly tolerated, and to avoid unacceptable steric interactions, these compounds adopt novel binding modes ...

    Evaluation of the effects of purine C-8 substitution within a series of CDK1/2-selective O(6)-cyclohexylmethylguanine derivatives revealed that potency decreases initially with increasing size of the alkyl substituent. Structural analysis showed that C-8 substitution is poorly tolerated, and to avoid unacceptable steric interactions, these compounds adopt novel binding modes. Thus, 2-amino-6-cyclohexylmethoxy-8-isopropyl-9H-purine adopts a "reverse" binding mode where the purine backbone has flipped 180°. This provided a novel lead chemotype from which we have designed more potent CDK2 inhibitors using, in the first instance, quantum mechanical energy calculations. Introduction of an ortho-tolyl or ortho-chlorophenyl group at the purine C-8 position restored the potency of these "reverse" binding mode inhibitors to that of the parent 2-amino-6-cyclohexylmethoxy-9H-purine. By contrast, the corresponding 8-(2-methyl-3-sulfamoylphenyl)-purine derivative exhibited submicromolar CDK2-inhibitory activity by virtue of engineered additional interactions with Asp86 and Lys89 in the reversed binding mode, as confirmed by X-ray crystallography.

    Organizational Affiliation: 

    Department of Biochemistry, University of Oxford , South Parks Road, Oxford OX1 3QU, U.K.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYCLIN-DEPENDENT KINASE 2A, C303Homo sapiensMutation(s): 0 
Gene Names: CDK2, CDKN2
EC: 2.7.11.22 (PDB Primary Data), 2.7.11.23 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P24941 (Homo sapiens)
Explore P24941 
Go to UniProtKB:  P24941
PHAROS:  P24941
GTEx:  ENSG00000123374 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP24941
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CYCLIN-A2B, D262Homo sapiensMutation(s): 0 
Gene Names: CCNA2, CCN1, CCNA
UniProt & NIH Common Fund Data Resources
Find proteins for P20248 (Homo sapiens)
Explore P20248 
Go to UniProtKB:  P20248
PHAROS:  P20248
GTEx:  ENSG00000145386 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20248
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
75X
Query on 75X
Download Ideal Coordinates CCD File 
E [auth A],
H [auth C]		3-[2-amino-6-(cyclohexylmethoxy)-7H-purin-8-yl]-2-methylphenol
C19 H23 N5 O2
GTQOUNMUULYWFG-UHFFFAOYSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
F [auth B],
G [auth B],
I [auth D],
J [auth D]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO		A, C L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Binding Affinity Annotations 
IDSourceBinding Affinity
75X Binding MOAD:  4CFV IC50: 2.35e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.068α = 90
b = 133.913β = 90
c = 147.89γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
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: 2014-12-10
    Type: Initial release