9ETV

Holo IDO with a bound inhibitor

• PDB DOI: https://doi.org/10.2210/pdb9ETV/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Drosophila melanogaster
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-03-27 Released: 2025-03-05 
• 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: 2.40 Å
• R-Value Free: 
  0.290 (Depositor), 0.264 (DCC) 
• R-Value Work: 
  0.260 (Depositor), 0.246 (DCC) 
• R-Value Observed: 
  0.261 (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: Dihedral - D2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 44.05 kDa 
• Atom Count: 2,889 
• Modelled Residue Count: 341 
• Deposited Residue Count: 365 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tryptophan 2,3-dioxygenase	A	365	Drosophila melanogaster	Mutation(s): 0  Gene Names: v, CG5163 EC: 1.13.11.11
UniProt
Find proteins for P20351 (Drosophila melanogaster) Explore P20351  Go to UniProtKB:  P20351

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	B [auth A]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
A1H61 (Subject of Investigation/LOI)	C [auth A]	6-methylimidazo[1,5-a]pyridine C8 H8 N2 LOHYEHLOEQRDHI-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free:  0.290 (Depositor), 0.264 (DCC) 
• R-Value Work:  0.260 (Depositor), 0.246 (DCC) 
• R-Value Observed: 0.261 (Depositor) 

Space Group: P 6₄ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 113.382	α = 90
b = 113.382	β = 90
c = 213.926	γ = 120

Software Package:

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

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-03-05 
Deposition Author(s): Wicki, M., Mac Sweeney, A.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2025-03-05
  Type: Initial release