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 and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 26.12 kDa 
• Atom Count: 1745 
• Modelled Residue Count: 210 
• Deposited Residue Count: 230 
• Unique protein chains: 1

4CWO

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

• PDB DOI: 10.2210/pdb4CWO/pdb

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


• Deposited: 2014-04-03 Released: 2014-07-09 
• Deposition Author(s): Casale, E., Amboldi, N., Brasca, G., Caronni, D., Colombo, N., Dalvit, C., Felder, E.R., Fogliatto, G., Isacchi, A., Mantegani, S., Polucci, P., Riceputi, L., Sola, F., Visco, C., Zuccotto, F., Casuscelli, F.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.31 Å
• R-Value Free: 0.253 
• R-Value Work: 0.196 
• R-Value Observed: 0.199 

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

• PubMed: 24980703 
• DOI: 10.1016/j.bmc.2014.05.056
• Primary Citation of 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: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HEAT SHOCK PROTEIN HSP 90-ALPHA	A	230	Homo sapiens	Mutation(s): 0  Gene Names: HSP90AA1, HSP90A, HSPC1, HSPCA
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
T62	B [auth A]	5-(2-amino-[1,2,4]triazolo[1,5-c]quinazolin-5-ylmethyl)-benzene-1,3-diol C16 H13 N5 O2 DXCBGOVJQFRCDX-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
T62	Binding MOAD:  4CWO	Ki: 6100 (nM) from 1 assay(s)
	BindingDB:  4CWO	Ki: 6100 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.31 Å
• R-Value Free: 0.253 
• R-Value Work: 0.196 
• R-Value Observed: 0.199 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 67.985	α = 90
b = 92.014	β = 90
c = 100.291	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-04-03 
• Released Date: 2014-07-09 
Deposition Author(s): Casale, E., Amboldi, N., Brasca, G., Caronni, D., Colombo, N., Dalvit, C., Felder, E.R., Fogliatto, G., Isacchi, A., Mantegani, S., Polucci, P., Riceputi, L., Sola, F., Visco, C., Zuccotto, F., Casuscelli, F.

Revision History  

• 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