2BRB image
Entry Detail
PDB ID:
2BRB
Keywords:
Title:
Structure-based Design of Novel Chk1 Inhibitors: Insights into Hydrogen Bonding and Protein-Ligand Affinity
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2005-05-04
Release Date:
2005-05-12
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.27
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:SERINE/THREONINE-PROTEIN KINASE CHK1
Chain IDs:A
Chain Length:297
Number of Molecules:1
Biological Source:HOMO SAPIENS
Primary Citation
Structure-Based Design of Novel Chk1 Inhibitors: Insights Into Hydrogen Bonding and Protein-Ligand Affinity.
J.Med.Chem. 48 4332 ? (2005)
PMID: 15974586 DOI: 10.1021/JM049022C

Abstact

We report the discovery, synthesis, and crystallographic binding mode of novel furanopyrimidine and pyrrolopyrimidine inhibitors of the Chk1 kinase, an oncology target. These inhibitors are synthetically tractable and inhibit Chk1 by competing for its ATP site. A chronological account allows an objective comparison of modeled compound docking modes to the subsequently obtained crystal structures. The comparison provides insights regarding the interpretation of modeling results, in relationship to the multiple reasonable docking modes which may be obtained in a kinase-ATP site. The crystal structures were used to guide medicinal chemistry efforts. This led to a thorough characterization of a pair of ligand-protein complexes which differ by a single hydrogen bond. An analysis indicates that this hydrogen bond is expected to contribute a fraction of the 10-fold change in binding affinity, adding a valuable observation to the debate about the energetic role of hydrogen bonding in molecular recognition.

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