7AKM

Crystal structure of CHK1 kinase domain in complex with ATPyS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural basis for recruitment of the CHK1 DNA damage kinase by the CLASPIN scaffold protein.

Day, M.Parry-Morris, S.Houghton-Gisby, J.Oliver, A.W.Pearl, L.H.

(2021) Structure 29: 531

  • DOI: https://doi.org/10.1016/j.str.2021.03.007
  • Primary Citation of Related Structures:  
    7AKM, 7AKO

  • PubMed Abstract: 

    CHK1 is a protein kinase that functions downstream of activated ATR to phosphorylate multiple targets as part of intra-S and G2/M DNA damage checkpoints. Its role in allowing cells to survive replicative stress has made it an important target for anti-cancer drug discovery. Activation of CHK1 by ATR depends on their mutual interaction with CLASPIN, a natively unstructured protein that interacts with CHK1 through a cluster of phosphorylation sites in its C-terminal half. We have now determined the crystal structure of the kinase domain of CHK1 bound to a high-affinity motif from CLASPIN. Our data show that CLASPIN engages a conserved site on CHK1 adjacent to the substrate-binding cleft, involved in phosphate sensing in other kinases. The CLASPIN motif is not phosphorylated by CHK1, nor does it affect phosphorylation of a CDC25 substrate peptide, suggesting that it functions purely as a scaffold for CHK1 activation by ATR.


  • Organizational Affiliation

    Cancer Research UK DNA Repair Enzymes Group, Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9RQ, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase Chk1
A, B
298Homo sapiensMutation(s): 1 
Gene Names: CHEK1CHK1
EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for O14757 (Homo sapiens)
Explore O14757 
Go to UniProtKB:  O14757
PHAROS:  O14757
GTEx:  ENSG00000149554 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14757
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
AGS (Subject of Investigation/LOI)
Query on AGS

Download Ideal Coordinates CCD File 
C [auth A]PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
C10 H16 N5 O12 P3 S
NLTUCYMLOPLUHL-KQYNXXCUSA-N
CIT
Query on CIT

Download Ideal Coordinates CCD File 
O [auth B]CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
H [auth A]
I [auth A]
J [auth B]
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth B],
K [auth B],
L [auth B],
M [auth B],
N [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A],
P [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.62α = 90
b = 89.27β = 90
c = 112.03γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
DIALSdata reduction
DIALSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Cancer Research UKUnited KingdomC302/A24386

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-14
    Type: Initial release
  • Version 1.1: 2021-06-16
    Changes: Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Database references, Refinement description