6KW7 image
Entry Detail
PDB ID:
6KW7
Keywords:
Title:
Crystal structure of indoleamine 2,3-dioxygenagse 1 (IDO1) in complex with compound 12
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2019-09-06
Release Date:
2020-03-25
Method Details:
Experimental Method:
Resolution:
3.02 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Indoleamine 2,3-dioxygenase 1
Chain IDs:A, B
Chain Length:403
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Unique Sulfur-Aromatic Interactions Contribute to the Binding of Potent Imidazothiazole Indoleamine 2,3-Dioxygenase Inhibitors.
J.Med.Chem. 63 1642 1659 (2020)
PMID: 31961685 DOI: 10.1021/acs.jmedchem.9b01549

Abstact

Indoleamine 2,3-dioxygenase (IDO1) inhibitors are speculated to be useful in cancer immunotherapy, but a phase III clinical trial of the most advanced IDO1 inhibitor, epacadostat, did not meet its primary end point and was abandoned. In previous work, we identified the novel IDO1 inhibitor N-(4-chlorophenyl)-2-((5-phenylthiazolo[2,3-c][1,2,4]triazol-3-yl)thio)acetamide 1 through high-throughput screening (HTS). Herein, we report a structure-activity relationship (SAR) study of this compound, which resulted in the potent IDO1 inhibitor 1-(4-cyanophenyl)-3-(3-(cyclopropylethynyl)imidazo[2,1-b]thiazol-5-yl)thiourea 47 (hIDO IC50 = 16.4 nM). X-ray cocrystal structural analysis revealed that the basis for this high potency is a unique sulfur-aromatic interaction network formed by the thiourea moiety of 47 with F163 and F226. This finding is expected to inspire new approaches toward the discovery of potent IDO1 inhibitors in the future.

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