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 
  • R-Value Observed: 0.201 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


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:  
    6FC8, 6FCF, 6FCK

  • 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 evaluated in clinical trials in combination with chemotherapeutics and radiation treatment ...

    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: 

    Oncology Chemistry, IMED Biotech Unit, AstraZeneca , 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein kinase Chk1A276Homo sapiensMutation(s): 0 
Gene Names: CHEK1, CHK1
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
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
D58 (Subject of Investigation/LOI)
Query on D58
Download Ideal Coordinates CCD File 
B [auth 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 Ideal Coordinates CCD File 
C [auth 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
Binding Affinity Annotations 
IDSourceBinding Affinity
D58 BindingDB:  6FCF IC50: 6 (nM) from 1 assay(s)
EC50: 8 (nM) from 1 assay(s)
Binding MOAD:  6FCF IC50: 6 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.171α = 90
b = 65.469β = 93.66
c = 59.257γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
MOSFLMdata reduction
SCALAdata scaling
autoBUSTERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


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  (Full details and data files)

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