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 4CWN | pdb_00004cwn

Human HSP90 alpha N-terminal domain in complex with an Aminotriazoloquinazoline inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 
    0.228 (Depositor), 0.227 (DCC) 
  • R-Value Work: 
    0.198 (Depositor), 0.197 (DCC) 
  • R-Value Observed: 
    0.200 (Depositor) 

wwPDB Validation 3D Report Full Report

Validation slider image for 4CWN

Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history. 

Literature

Fragment-Based Hit Discovery and Structure-Based Optimization of Aminotriazoloquinazolines as Novel Hsp90 Inhibitors.

Casale, E., Amboldi, N., Brasca, M.G., Caronni, D., Colombo, N., Dalvit, C., Felder, E.R., Fogliatto, G., Galvani, A., Isacchi, A., Polucci, P., Riceputi, L., Sola, F., Visco, C., Zuccotto, F., Casuscelli, F.

(2014) Bioorg Med Chem 22: 4135

  • DOI: https://doi.org/10.1016/j.bmc.2014.05.056
  • Primary Citation Related Structures: 
    4CWF, 4CWN, 4CWO, 4CWP, 4CWQ, 4CWR, 4CWS, 4CWT

  • PubMed Abstract: 

    In the last decade the heat shock protein 90 (Hsp90) has emerged as a major therapeutic target and many efforts have been dedicated to the discovery of Hsp90 inhibitors as new potent anticancer agents. Here we report the identification of a novel class of Hsp90 inhibitors by means of a biophysical FAXS-NMR based screening of a library of fragments. The use of X-ray structure information combined with modeling studies enabled the fragment evolution of the initial triazoloquinazoline hit to a class of compounds with nanomolar potency and drug-like properties suited for further lead optimization.


  • Organizational Affiliation: 
    • Oncology, Nerviano Medical Sciences, Viale Pasteur 10, 20014 Nerviano (MI), Italy. Electronic address: elena.casale@nervianoms.com.

Macromolecule Content 

  • Total Structure Weight: 26.15 kDa 
  • Atom Count: 1,844 
  • Modeled Residue Count: 207 
  • Deposited Residue Count: 230 
  • Unique protein chains: 1

Macromolecules

Find similar proteins by:|  3D Structure
Entity ID: 1
MoleculeChains  Sequence LengthOrganismDetailsImage
HEAT SHOCK PROTEIN HSP 90-ALPHA230Homo sapiensMutation(s): 0 
EC: 3.6.4.10
UniProt & NIH Common Fund Data Resources
Find proteins for P07900 (Homo sapiens)
Explore P07900 
Go to UniProtKB:  P07900
PHAROS:  P07900
GTEx:  ENSG00000080824 
Entity Groups
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07900
Sequence Annotations
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Reference Sequence

Small Molecules

Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
6LV

Query on 6LV



Download:Ideal Coordinates CCD File
B [auth A]5-(3,5-dimethoxybenzyl)[1,2,4]triazolo[1,5-c]quinazolin-2-amine
C18 H17 N5 O2
OOUWYRBLMZEUGI-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
6LV BindingDB:  4CWN Ki: 2600 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free:  0.228 (Depositor), 0.227 (DCC) 
  • R-Value Work:  0.198 (Depositor), 0.197 (DCC) 
  • R-Value Observed: 0.200 (Depositor) 
Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.179α = 90
b = 90.712β = 90
c = 99.232γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-09
    Type: Initial release
  • Version 1.1: 2014-08-06
    Changes: Database references
  • Version 1.2: 2017-06-28
    Changes: Data collection
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other