Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 28.37 kDa 
• Atom Count: 1993 
• Residue Count: 221 
• Unique protein chains: 1

2XJX

Structure of HSP90 with small molecule inhibitor bound

• DOI: 10.2210/pdb2XJX/pdb

• Classification: CHAPERONE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2010-07-06 Released: 2010-08-11 
• Deposition Author(s): Murray, C.W., Carr, M.G., Callaghan, O., Chessari, G., Congreve, M., Cowan, S., Coyle, J.E., Downham, R., Figueroa, E., Frederickson, M., Graham, B., McMenamin, R., OBrien, M.A., Patel, S., Phillips, T.R., Williams, G., Woodhead, A.J., Woolford, A.J.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.66 Å
• R-Value Free: 0.208 
• R-Value Work: 0.155 
• R-Value Observed: 0.158 

Literature

Discovery of (2,4-Dihydroxy-5-Isopropylphenyl)-[5-(4-Methylpiperazin-1-Ylmethyl)-1,3-Dihydroisoindol-2-Yl]Methanone (at13387), a Novel Inhibitor of the Molecular Chaperone Hsp90 by Fragment Based Drug Design.

Woodhead, A.J., Angove, H., Carr, M.G., Chessari, G., Congreve, M., Coyle, J.E., Cosme, J., Graham, B., Day, P.J., Downham, R., Fazal, L., Feltell, R., Figueroa, E., Frederickson, M., Lewis, J., Mcmenamin, R., Murray, C.W., O'Brien, M.A., Parra, L., Patel, S., Phillips, T., Rees, D.C., Rich, S., Smith, D.M., Trewartha, G., Vinkovic, M., Williams, B., Woolford, A.J.

(2010) J Med Chem 53: 5956

• PubMed: 20662534 
• DOI: 10.1021/jm100060b
• Primary Citation of Related Structures:  
  2XAB, 2XJX, 2XJG, 2XJJ


• PubMed Abstract: 
  

Inhibitors of the molecular chaperone heat shock protein 90 (Hsp90) are currently generating significant interest in clinical development as potential treatments for cancer. In a preceding publication (DOI: 10.1021/jm100059d ) we describe Astex's approach to screening fragments against Hsp90 and the subsequent optimization of two hits into leads with inhibitory activities in the low nanomolar range. This paper describes the structure guided optimization of the 2,4-dihydroxybenzamide lead molecule 1 and details some of the drug discovery strategies employed in the identification of AT13387 (35), which has progressed through preclinical development and is currently being tested in man.

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Organizational Affiliation: 

Medicinal Chemistry, Astex Therapeutics, Ltd., Cambridge, UK. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HEAT SHOCK PROTEIN HSP 90-ALPHA	A	249	Homo sapiens	Mutation(s): 0  Gene Names: HSP90AA1, HSP90A, HSPC1, HSPCA
Find proteins for P07900 (Homo sapiens) Explore P07900  Go to UniProtKB:  P07900
NIH Common Fund Data Resources
PHAROS  P07900 GTEx  ENSG00000080824

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
XJX	A	Onalespib C24 H31 N3 O3 IFRGXKKQHBVPCQ-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
XJX	IC50:  14   nM  BindingDB
XJX	IC50:  22   nM  BindingDB
XJX	IC50:  350   nM  BindingDB
XJX	Kd:  0.7099999785423279   nM  Binding MOAD
XJX	IC50:  30   nM  BindingDB
XJX	Kd :  0.7099999785423279   nM  PDBBind

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.66 Å
• R-Value Free: 0.208 
• R-Value Work: 0.155 
• R-Value Observed: 0.158 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 44.95	α = 90
b = 41.05	β = 101.86
c = 49.23	γ = 90

Software Package:

Software Name	Purpose
BUSTER-TNT	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-07-06 
• Released Date: 2010-08-11 
Deposition Author(s): Murray, C.W., Carr, M.G., Callaghan, O., Chessari, G., Congreve, M., Cowan, S., Coyle, J.E., Downham, R., Figueroa, E., Frederickson, M., Graham, B., McMenamin, R., OBrien, M.A., Patel, S., Phillips, T.R., Williams, G., Woodhead, A.J., Woolford, A.J.A.

Revision History 

• Version 1.0: 2010-08-11
  Type: Initial release
  
• Version 1.1: 2013-04-24
  Changes: Other, Structure summary, Version format compliance
• Version 1.2: 2015-02-18
  Changes: Non-polymer description, Structure summary