Nek2 bound to purine compound 51

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

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Ligand Structure Quality Assessment 

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Nek7 conformational flexibility and inhibitor binding probed through protein engineering of the R-spine.

Byrne, M.J.Nasir, N.Basmadjian, C.Bhatia, C.Cunnison, R.F.Carr, K.H.Mas-Droux, C.Yeoh, S.Cano, C.Bayliss, R.

(2020) Biochem J 477: 1525-1539

  • DOI: https://doi.org/10.1042/BCJ20200128
  • Primary Citation of Related Structures:  
    6S73, 6S75, 6S76, 6SK9

  • PubMed Abstract: 

    Nek7 is a serine/threonine-protein kinase required for proper spindle formation and cytokinesis. Elevated Nek7 levels have been observed in several cancers, and inhibition of Nek7 might provide a route to the development of cancer therapeutics. To date, no selective and potent Nek7 inhibitors have been identified. Nek7 crystal structures exhibit an improperly formed regulatory-spine (R-spine), characteristic of an inactive kinase. We reasoned that the preference of Nek7 to crystallise in this inactive conformation might hinder attempts to capture Nek7 in complex with Type I inhibitors. Here, we have introduced aromatic residues into the R-spine of Nek7 with the aim to stabilise the active conformation of the kinase through R-spine stacking. The strong R-spine mutant Nek7SRS retained catalytic activity and was crystallised in complex with compound 51, an ATP-competitive inhibitor of Nek2 and Nek7. Subsequently, we obtained the same crystal form for wild-type Nek7WT in apo form and bound to compound 51. The R-spines of the three well-ordered Nek7WT molecules exhibit variable conformations while the R-spines of the Nek7SRS molecules all have the same, partially stacked configuration. Compound 51 bound to Nek2 and Nek7 in similar modes, but differences in the precise orientation of a substituent highlights features that could be exploited in designing inhibitors that are selective for particular Nek family members. Although the SRS mutations are not required to obtain a Nek7-inhibitor structure, we conclude that it is a useful strategy for restraining the conformation of a kinase in order to promote crystallogenesis.

  • Organizational Affiliation

    Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, U.K.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase Nek2279Homo sapiensMutation(s): 0 
Gene Names: NEK2NEK2ANLK1
UniProt & NIH Common Fund Data Resources
Find proteins for P51955 (Homo sapiens)
Explore P51955 
Go to UniProtKB:  P51955
GTEx:  ENSG00000117650 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP51955
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
F9N (Subject of Investigation/LOI)
Query on F9N

Download Ideal Coordinates CCD File 
B [auth A]3-[[6-(cyclohexylmethoxy)-7~{H}-purin-2-yl]amino]-~{N}-[3-(dimethylamino)propyl]benzenesulfonamide
C23 H33 N7 O3 S
Query on GOL

Download Ideal Coordinates CCD File 
C3 H8 O3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.02α = 90
b = 56.89β = 132.42
c = 77.94γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Cancer Research UKUnited KingdomC24461/ A13231
Medical Research Council (United Kingdom)United KingdomMR/L017032/1

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-17
    Type: Initial release
  • Version 1.1: 2024-05-15
    Changes: Data collection, Database references