9EW0 | pdb_00009ew0

Holo IDO with a bound inhibitor

• PDB DOI: https://doi.org/10.2210/pdb9EW0/pdb

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


• Deposited: 2024-04-03 Released: 2025-04-02 
• Deposition Author(s): Wicki, M., Mac Sweeney, A.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 
  0.278 (Depositor), 0.262 (DCC) 
• R-Value Work: 
  0.249 (Depositor), 0.236 (DCC) 
• R-Value Observed: 
  0.251 (Depositor) 

Starting Model: experimental

Literature

SAR and cellular potency optimization of novel heme-binding IDO1 inhibitors

Cren, S., Lotz, C., Mac Sweeney, A., Lange, R., Kimmerlin, T.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 95.86 kDa 
• Atom Count: 6,219 
• Modeled Residue Count: 749 
• Deposited Residue Count: 836 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Indoleamine 2,3-dioxygenase 1	A, B	418	Homo sapiens	Mutation(s): 0  Gene Names: IDO1, IDO, INDO EC: 1.13.11.52
UniProt & NIH Common Fund Data Resources
Find proteins for P14902 (Homo sapiens) Explore P14902  Go to UniProtKB:  P14902
PHAROS:  P14902 GTEx:  ENSG00000131203

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	C [auth A], E [auth B]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
A1H6U (Subject of Investigation/LOI)	D [auth A], F [auth B]	(~{S})-cyclohexyl(imidazo[1,5-a]pyridin-5-yl)methanol C14 H18 N2 O MHPBLJWAAANDQV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free:  0.278 (Depositor), 0.262 (DCC) 
• R-Value Work:  0.249 (Depositor), 0.236 (DCC) 
• R-Value Observed: 0.251 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85.05	α = 90
b = 92.891	β = 90
c = 129.357	γ = 90

Software Package:

Software Name	Purpose
BUSTER	refinement
autoPROC	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-04-02 
Deposition Author(s): Wicki, M., Mac Sweeney, A.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2025-04-02
  Type: Initial release