2FWZ

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

Experimental Data Snapshot

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

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This is version 1.2 of the entry. See complete history. 


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

  • DOI: 10.1021/jm060297x
  • Primary Citation of Related Structures:  
    2FWZ, 2FWY, 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 ...

    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.

    Organizational Affiliation: 

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



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Heat shock protein HSP 90-alphaA256Homo sapiensMutation(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
GTEx:  ENSG00000080824
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
H71
Query on H71
Download Ideal Coordinates CCD File 
 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		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
H71IC50:  51   nM  BindingDB
H71IC50:  43   nM  BindingDB
H71IC50:  60   nM  BindingDB
H71EC50:  59.599998474121094   nM  BindingDB
H71EC50:  16   nM  BindingDB
H71EC50:  6000   nM  BindingDB
H71IC50:  50   nM  BindingDB
H71IC50:  42   nM  BindingDB
H71IC50:  43   nM  BindingDB
H71EC50:  10.199999809265137   nM  BindingDB
H71IC50:  89   nM  BindingDB
H71IC50:  50   nM  Binding MOAD
H71EC50:  2200   nM  BindingDB
H71EC50:  16.100000381469727   nM  BindingDB
H71IC50 :  50   nM  PDBBind
H71EC50:  50   nM  BindingDB
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 = 66.68α = 90
b = 91.28β = 90
c = 98.64γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
XDSdata scaling
CNSphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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