6FCF

CHK1 KINASE IN COMPLEX WITH COMPOUND 44

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Adventures in Scaffold Morphing: Discovery of Fused Ring Heterocyclic Checkpoint Kinase 1 (CHK1) Inhibitors.

Yang, B., Vasbinder, M.M., Hird, A.W., Su, Q., Wang, H., Yu, Y., Toader, D., Lyne, P.D., Read, J.A., Breed, J., Ioannidis, S., Deng, C., Grondine, M., DeGrace, N., Whitston, D., Brassil, P., Janetka, J.W.

(2018) J. Med. Chem. 61: 1061-1073

  • DOI: 10.1021/acs.jmedchem.7b01490
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Checkpoint kinase 1 (CHK1) inhibitors are potential cancer therapeutics that can be utilized for enhancing the efficacy of DNA damaging agents. Multiple small molecule CHK1 inhibitors from different chemical scaffolds have been developed and evaluate ...

    Checkpoint kinase 1 (CHK1) inhibitors are potential cancer therapeutics that can be utilized for enhancing the efficacy of DNA damaging agents. Multiple small molecule CHK1 inhibitors from different chemical scaffolds have been developed and evaluated in clinical trials in combination with chemotherapeutics and radiation treatment. Scaffold morphing of thiophene carboxamide ureas (TCUs), such as AZD7762 (1) and a related series of triazoloquinolines (TZQs), led to the identification of fused-ring bicyclic CHK1 inhibitors, 7-carboxamide thienopyridines (7-CTPs), and 7-carboxamide indoles. X-ray crystal structures reveal a key intramolecular noncovalent sulfur-oxygen interaction in aligning the hinge-binding carboxamide group to the thienopyridine core in a coplanar fashion. An intramolecular hydrogen bond to an indole NH was also effective in locking the carboxamide in the preferred bound conformation to CHK1. Optimization on the 7-CTP series resulted in the identification of lead compound 44, which displayed respectable drug-like properties and good in vitro and in vivo potency.

    Organizational Affiliation: 

    Discovery Sciences, IMED Biotech Unit, AstraZeneca , Building 310, Cambridge Science Park, Milton Road, Cambridge CB4 0WG, U.K.,Oncology Chemistry, IMED Biotech Unit, AstraZeneca , 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase Chk1
A
276Homo sapiensMutation(s): 0 
Gene Names: CHEK1 (CHK1)
EC: 2.7.11.1
Find proteins for O14757 (Homo sapiens)
Go to Gene View: CHEK1
Go to UniProtKB:  O14757
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
D58
Query on D58
Download SDF File 
Download CCD File 
A
4-[[(2~{R},3~{S})-2-methylpiperidin-3-yl]amino]-2-phenyl-thieno[3,2-c]pyridine-7-carboxamide
C20 H22 N4 O S
LMQOZGSVTQQPFU-WBMJQRKESA-N
 Ligand Interaction
SO4
Query on SO4
Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CSS
Query on CSS
A
L-PEPTIDE LINKINGC3 H7 N O2 S2CYS
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
D58IC50: 6 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.200 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 42.171α = 90.00
b = 65.469β = 93.66
c = 59.257γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
autoBUSTERphasing
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2017-12-20 
  • Released Date: 2018-01-17 
  • Deposition Author(s): Read, J.A., Breed, J.

Revision History 

  • Version 1.0: 2018-01-17
    Type: Initial release
  • Version 1.1: 2018-02-21
    Type: Database references