4YKQ | pdb_00004ykq

Heat Shock Protein 90 Bound to CS301

• PDB DOI: https://doi.org/10.2210/pdb4YKQ/pdb

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


• Deposited: 2015-03-04 Released: 2016-03-09 
• Deposition Author(s): Kang, Y.N., Stuckey, J.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.91 Å
• R-Value Free: 
  0.201 (Depositor), 0.207 (DCC) 
• R-Value Work: 
  0.175 (Depositor) 
• R-Value Observed: 
  0.176 (Depositor) 

Starting Model: other

Literature

Structure of Heat Shock Protein 90 Bound to CS301

Kang, Y.N., Stuckey, J.A.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 27.01 kDa 
• Atom Count: 1,840 
• Modeled Residue Count: 208 
• Deposited Residue Count: 238 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Heat shock protein HSP 90-alpha	A	238	Homo sapiens	Mutation(s): 0  Gene Names: HSP90AA1, HSP90A, HSPC1, HSPCA 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

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
4EO	B [auth A]	1-(5-ethyl-2,4-dihydroxyphenyl)-1,3-dihydro-2H-benzimidazol-2-one C15 H14 N2 O3 ZNBISFUDIQEGEX-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
4EO	BindingDB:  4YKQ	Kd: min: 69, max: 165 (nM) from 2 assay(s)
		IC50: 24.8 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.91 Å
• R-Value Free:  0.201 (Depositor), 0.207 (DCC) 
• R-Value Work:  0.175 (Depositor) 
• R-Value Observed: 0.176 (Depositor) 

Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 64.793	α = 90
b = 88.934	β = 90
c = 99.745	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data reduction
HKL-2000	data scaling
BUSTER-TNT	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2016-03-09 
Deposition Author(s): Kang, Y.N., Stuckey, J.A.

Revision History  

• Version 1.0: 2016-03-09
  Type: Initial release
  
• Version 1.1: 2016-04-13
  Changes: Derived calculations
• Version 1.2: 2024-02-28
  Changes: Data collection, Database references, Derived calculations
• Version 1.3: 2026-03-04
  Changes: Refinement description, Structure summary