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 

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Ligand Structure Quality Assessment 


This is version 1.1 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: 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 ...

    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
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein kinase Chk1A273Homo 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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14757
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / 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		 Ligand Interaction
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

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Ligand Structure Quality Assessment 


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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