Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 29285.51 
• Atom Count: 1769 
• Residue Count: 256 
• Unique protein chains: 1

2FWZ

Structure of human Hsp90-alpha bound to the potent water soluble inhibitor PU-H71

• DOI: 10.2210/pdb2FWZ/pdb

• Classification: CHAPERONE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2006-02-03 Released: 2006-10-03 
• Deposition Author(s): Immormino, R.M., Gewirth, D.T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Free: 0.228 
• R-Value Work: 0.190 

Literature

Structural and quantum chemical studies of 8-aryl-sulfanyl adenine class Hsp90 inhibitors.

Immormino, R.M., Kang, Y., Chiosis, G., Gewirth, D.T.

(2006) J.Med.Chem. 49: 4953-4960

• PubMed: 16884307 
• DOI: 10.1021/jm060297x
• Primary Citation of Related Structures:  
  2H55, 2FWY


• PubMed Abstract: 
  

Hsp90 chaperones play a critical role in modulating the activity of many cell signaling proteins and are an attractive target for anti-cancer therapeutics. We report here the structures of the water soluble 8-aryl-sulfanyl adenine class Hsp90 inhibitors, 1 (PU-H71) and 2 (PU-H64), in complex with the N-terminal domain of human Hsp90alpha. The conformation of 1 when bound to Hsp90 differs from previously reported 8-aryl adenine Hsp90 inhibitors including 3 (PU24FCl). While the binding mode for 3 places the 2'-halide of the 8-aryl group on top of the adenine ring, for 1 and 2, we show that the 2'-halide is rotated approximately 180 degrees away. This difference explains the opposing trends in Hsp90 inhibitory activity for the 2'-halo derivatives of the 3',4',5'-trimethoxy series where Cl > Br > I compared to the 4',5'-methylenedioxy series where I > Br > Cl. We also present quantum chemical calculations of 2 and its analogues that illuminate their basis for Hsp90 inhibition. The calculated conformation of 2 agreed well with the crystallographically observed conformations of 1 and 2. The predictive nature of the calculations has allowed the exploration of additional derivatives based on the 8-aryl adenine scaffold.

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Organizational Affiliation: 

Hauptman-Woodward Medical Research Institute, Buffalo, New York 14203, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Heat shock protein HSP 90-alpha	A	256	Homo sapiens	Mutation(s): 0  Gene Names: HSP90AA1 (HSP90A, HSPC1, HSPCA)
Find proteins for P07900 (Homo sapiens) Go to Gene View: HSP90AA1 Go to UniProtKB:  P07900

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
H71	A	8-[(6-IODO-1,3-BENZODIOXOL-5-YL)THIO]-9-[3-(ISOPROPYLAMINO)PROPYL]-9H-PURIN-6-AMINE C18 H21 I N6 O2 S SUPVGFZUWFMATN-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
H71	IC50: 42 - 51 nM (92) BINDINGDB
H71	EC50: 10.2 - 6000 nM (92) BINDINGDB
H71	IC50: 50 nM BINDINGMOAD
H71	IC50: 50 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Free: 0.228 
• R-Value Work: 0.190 
• Space Group: I 2 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 66.680	α = 90.00
b = 91.280	β = 90.00
c = 98.640	γ = 90.00

Software Package:

Software Name	Purpose
XDS	data scaling
HKL-2000	data reduction
CNS	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-02-03 
• Released Date: 2006-10-03 
• Deposition Author(s): Immormino, R.M., Gewirth, D.T.

Revision History 

• Version 1.0: 2006-10-03
  Type: Initial release
• Version 1.1: 2008-05-01
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance