3OT3

X-ray crystal structure of compound 22k bound to human Chk1 kinase domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.44 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Discovery of pyrazolo[1,5-a]pyrimidine-based CHK1 inhibitors: A template-based approach-Part 2.

Labroli, M.Paruch, K.Dwyer, M.P.Alvarez, C.Keertikar, K.Poker, C.Rossman, R.Duca, J.S.Fischmann, T.O.Madison, V.Parry, D.Davis, N.Seghezzi, W.Wiswell, D.Guzi, T.J.

(2011) Bioorg Med Chem Lett 21: 471-474

  • DOI: https://doi.org/10.1016/j.bmcl.2010.10.114
  • Primary Citation of Related Structures:  
    3OT3

  • PubMed Abstract: 

    Previous efforts by our group have established pyrazolo[1,5-a]pyrimidine as a viable core for the development of potent and selective CDK inhibitors. As part of an effort to utilize the pyrazolo[1,5-a]pyrimidine core as a template for the design and synthesis of potent and selective kinase inhibitors, we focused on a key regulator in the cell cycle progression, CHK1. Continued SAR development of the pyrazolo[1,5-a]pyrimidine core at the C5 and C6 positions, in conjunction with previously disclosed SAR at the C3 and C7 positions, led to the discovery of potent and selective CHK1 inhibitors.


  • Organizational Affiliation

    Merck Research Laboratories, 2015 Galloping Hill Road, Kenilworth, NJ 07033, United States. marc.labroli@merck.com


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase Chk1273Homo sapiensMutation(s): 0 
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
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
22K
Query on 22K

Download Ideal Coordinates CCD File 
B [auth A]5-[(1R,3S)-3-aminocyclohexyl]-6-bromo-3-(1-methyl-1H-pyrazol-4-yl)pyrazolo[1,5-a]pyrimidin-7-amine
C16 H20 Br N7
CKLKHZYNDIKOOE-KOLCDFICSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
22K PDBBind:  3OT3 IC50: 5 (nM) from 1 assay(s)
Binding MOAD:  3OT3 IC50: 5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.44 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.83α = 90
b = 65.78β = 94.41
c = 57.72γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
BUSTERrefinement
DENZOdata reduction
SCALEPACKdata scaling
BUSTERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description