1IEP

CRYSTAL STRUCTURE OF THE C-ABL KINASE DOMAIN IN COMPLEX WITH STI-571.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.231 

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Literature

Crystal structures of the kinase domain of c-Abl in complex with the small molecule inhibitors PD173955 and imatinib (STI-571)

Nagar, B., Bornmann, W., Pellicena, P., Schindler, T., Veach, D.R., Miller, W.T., Clarkson, B., Kuriyan, J.

(2002) Cancer Res 62: 4236-4243

  • Primary Citation of Related Structures:  
    1M52, 1IEP

  • PubMed Abstract: 

    • The inadvertent fusion of the bcr gene with the abl gene results in a constitutively active tyrosine kinase (Bcr-Abl) that transforms cells and causes chronic myelogenous leukemia. Small molecule inhibitors of Bcr-Abl that bind to the kinase domain can be used to treat chronic myelogenous leukemia ...

    The inadvertent fusion of the bcr gene with the abl gene results in a constitutively active tyrosine kinase (Bcr-Abl) that transforms cells and causes chronic myelogenous leukemia. Small molecule inhibitors of Bcr-Abl that bind to the kinase domain can be used to treat chronic myelogenous leukemia. We report crystal structures of the kinase domain of Abl in complex with two such inhibitors, imatinib (also known as STI-571 and Gleevec) and PD173955 (Parke-Davis). Both compounds bind to the canonical ATP-binding site of the kinase domain, but they do so in different ways. As shown previously in a crystal structure of Abl bound to a smaller variant of STI-571, STI-571 captures a specific inactive conformation of the activation loop of Abl in which the loop mimics bound peptide substrate. In contrast, PD173955 binds to a conformation of Abl in which the activation loop resembles that of an active kinase. The structure suggests that PD173955 would be insensitive to whether the conformation of the activation loop corresponds to active kinases or to that seen in the STI-571 complex. In vitro kinase assays confirm that this is the case and indicate that PD173955 is at least 10-fold more inhibitory than STI-571. The structures suggest that PD173955 achieves its greater potency over STI-571 by being able to target multiple forms of Abl (active or inactive), whereas STI-571 requires a specific inactive conformation of Abl.

    Organizational Affiliation: 

    Department of Molecular and Cell Biology and Howard Hughes Medical Institute, University of California, Berkeley, California 94720, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTO-ONCOGENE TYROSINE-PROTEIN KINASE ABLA, B293Mus musculusMutation(s): 0 
Gene Names: Abl1, Abl
EC: 2.7.1.112 (PDB Primary Data), 2.7.10.2 (UniProt)
UniProt
Find proteins for P00520 (Mus musculus)
Explore P00520 
Go to UniProtKB:  P00520
Protein Feature View
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  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
STI BindingDB:  1IEP Ki: min: 13, max: 7000 (nM) from 5 assay(s)
Kd: min: 1, max: 1.00e+4 (nM) from 35 assay(s)
IC50: min: 1.1, max: 1.00e+4 (nM) from 57 assay(s)
EC50: min: 34, max: 1000 (nM) from 4 assay(s)
PDBBind:  1IEP IC50: 100 (nM) from 1 assay(s)
Binding MOAD:  1IEP IC50: 100 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.231 
  • Space Group: F 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.885α = 90
b = 147.371β = 90
c = 153.442γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-04-18
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance