6DPR

Mapping the binding trajectory of a suicide inhibitor in human indoleamine 2,3-dioxygenase 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Mapping the Binding Trajectory of a Suicide Inhibitor in Human Indoleamine 2,3-Dioxygenase 1.

Pham, K.N.Yeh, S.R.

(2018) J Am Chem Soc 140: 14538-14541

  • DOI: https://doi.org/10.1021/jacs.8b07994
  • Primary Citation of Related Structures:  
    6DPQ, 6DPR, 6MQ6

  • PubMed Abstract: 

    Human indoleamine 2,3-dioxygenase 1 (hIDO1) is an important heme-containing enzyme that is a key drug target for cancer immunotherapy. Several hIDO1 inhibitors have entered clinical trials, among which BMS-986205 (BMS) stands out as the only suicide inhibitor. Despite its "best-in-class" activity, the action mechanism of BMS remains elusive. Here, we report three crystal structures of hIDO1-BMS complexes that define the complete binding trajectory of the inhibitor. BMS first binds in a solvent exposed surface cleft near the active site in an extended conformation. The initial binding partially unfolds the active site, which triggers heme release, thereby exposing a new binding pocket. The inhibitor then undergoes a large scale movement to this new binding pocket, where it binds by adopting a high energy kinked conformation. Finally, the inhibitor relaxes to a bent conformation, via an additional large scale rearrangement, culminating in the energy minimum state. The structural data offer a molecular explanation for the remarkable efficacy and suicide inhibition activity of the inhibitor. They also suggest a novel strategy that can be applied for drug development targeting hIDO1 and related enzymes.


  • Organizational Affiliation

    Department of Physiology and Biophysics , Albert Einstein College of Medicine , Bronx , New York 10461 , United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Indoleamine 2,3-dioxygenase 1
A, B
424Homo sapiensMutation(s): 0 
Gene Names: IDO1IDOINDO
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 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14902
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
C [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
H7P
Query on H7P

Download Ideal Coordinates CCD File 
D [auth A],
J [auth B]
(2R)-N-(4-chlorophenyl)-2-[cis-4-(6-fluoroquinolin-4-yl)cyclohexyl]propanamide
C24 H24 Cl F N2 O
KRTIYQIPSAGSBP-ZACQAIPSSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
H [auth A]
I [auth A]
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
K [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.534α = 90
b = 97.234β = 90
c = 128.289γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM115773
National Science Foundation (NSF, United States)United StatesCHE-1404929

Revision History  (Full details and data files)

  • Version 1.0: 2018-11-07
    Type: Initial release
  • Version 1.1: 2018-11-21
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description
  • Version 1.4: 2023-11-29
    Changes: Database references