Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 29.29 kDa 
• Atom Count: 2091 
• Modelled Residue Count: 208 
• Deposited Residue Count: 256 
• Unique protein chains: 1

2FWZ

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

• PDB DOI: 10.2210/pdb2FWZ/pdb

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


• 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: 2.10 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:  
  2FWY, 2FWZ, 2H55


• 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

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Heat shock protein HSP 90-alpha	A	256	Homo sapiens	Mutation(s): 0  Gene Names: HSPCA, HSP90AA1, HSP90A, HSPC1
UniProt & NIH Common Fund Data Resources
Find proteins for P07900 (Homo sapiens) Explore P07900  Go to UniProtKB:  P07900
PHAROS:  P07900

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
H71	B [auth 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

Binding Affinity Annotations
ID	Source	Binding Affinity
H71	PDBBind:  2FWZ	IC50: 50 (nM) from 1 assay(s)
	BindingDB:  2FWZ	IC50: min: 42, max: 126 (nM) from 8 assay(s)
		EC50: min: 10, max: 6000 (nM) from 8 assay(s)
	Binding MOAD:  2FWZ	IC50: 50 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.228 
• R-Value Work: 0.190 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 66.68	α = 90
b = 91.28	β = 90
c = 98.64	γ = 90

Software Package:

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

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
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance