4A28

Eg5-2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Mitotic Kinesin Eg5 Overcomes Inhibition to the Phase I/II Clinical Candidate Sb743921 by an Allosteric Resistance Mechanism.

Talapatra, S.K.Anthony, N.G.Mackay, S.P.Kozielski, F.

(2013) J.Med.Chem. 56: 6317

  • DOI: 10.1021/jm4006274
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Development of drug resistance during cancer chemotherapy is one of the major causes of chemotherapeutic failure for the majority of clinical agents. The aim of this study was to investigate the underlying molecular mechanism of resistance developed ...

    Development of drug resistance during cancer chemotherapy is one of the major causes of chemotherapeutic failure for the majority of clinical agents. The aim of this study was to investigate the underlying molecular mechanism of resistance developed by the mitotic kinesin Eg5 against the potent second-generation ispinesib analogue SB743921 (1), a phase I/II clinical candidate. Biochemical and biophysical data demonstrate that point mutations in the inhibitor-binding pocket decrease the efficacy of 1 by several 1000-fold. Surprisingly, the structures of wild-type and mutant Eg5 in complex with 1 display no apparent structural changes in the binding configuration of the drug candidate. Furthermore, ITC and modeling approaches reveal that resistance to 1 is not through conventional steric effects at the binding site but through reduced flexibility and changes in energy fluctuation pathways through the protein that influence its function. This is a phenomenon we have called "resistance by allostery".


    Organizational Affiliation

    The Beatson Institute for Cancer Research, Garscube Estate, Switchback Road, Bearsden, Glasgow G61 1BS, Scotland, U.K. s.talapatra@ed.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
KINESIN-LIKE PROTEIN KIF11
A, B
368Homo sapiensMutation(s): 1 
Gene Names: KIF11 (EG5, KNSL1, TRIP5)
Find proteins for P52732 (Homo sapiens)
Go to Gene View: KIF11
Go to UniProtKB:  P52732
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
A, B
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.180 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 52.900α = 90.00
b = 78.390β = 93.16
c = 92.690γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
MOSFLMdata reduction
PHENIXrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-10-31
    Type: Initial release
  • Version 1.1: 2013-07-31
    Type: Database references
  • Version 1.2: 2013-09-04
    Type: Database references