6E42

CRYSTAL STRUCTURE OF HUMAN INDOLEAMINE 2,3-DIOXYGENASE 1 (IDO1) in complex with ferric heme and 4-Chlorophenyl imidazole

Summary for 6E42

• Entry DOI: 10.2210/pdb6e42/pdb
• Descriptor: Indoleamine 2,3-dioxygenase 1, PROTOPORPHYRIN IX CONTAINING FE, 4-(3-chlorophenyl)-1H-imidazole, ... (5 entities in total)
• Functional Keywords: ido1, 4-chlorophenyl imidazole, inhibitor complex, oxidoreductase-oxidoreductase inhibitor complex, oxidoreductase/oxidoreductase inhibitor
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 4
• Total formula weight: 186622.40

Authors

Luo, S.,Tong, L. (deposition date: 2018-07-16, release date: 2018-11-14, Last modification date: 2024-03-13)

Primary citation

Luo, S.,Xu, K.,Xiang, S.,Chen, J.,Chen, C.,Guo, C.,Tong, Y.,Tong, L.
High-resolution structures of inhibitor complexes of human indoleamine 2,3-dioxygenase 1 in a new crystal form.
Acta Crystallogr F Struct Biol Commun, 74:717-724, 2018

PubMed Abstract: Human indoleamine 2,3-dioxygenase 1 (IDO1) is a heme-dependent enzyme with important roles in many cellular processes and is a potential target for drug discovery against cancer and other diseases. Crystal structures of IDO1 in complex with various inhibitors have been reported. Many of these crystals belong to the same crystal form and most of the reported structures have resolutions in the range 3.2-2.3 Å. Here, three new crystal forms of human IDO1 obtained by introducing a surface mutation, K116A/K117A, distant from the active site are reported. One of these crystal forms diffracted to 1.5 Å resolution and can be readily used for soaking experiments to determine high-resolution structures of IDO1 in complex with the substrate tryptophan or inhibitors that coordinate the heme. In addition, this mutant was used to produce crystals of a complex with an inhibitor that targets the apo form of the enzyme under the same conditions; the structure of this complex was determined at 1.7 Å resolution. Overall, this mutant represents a robust platform for determining the structures of inhibitor and substrate complexes of IDO1 at high resolution.

PubMed: 30387777
DOI: 10.1107/S2053230X18012955

Experimental method

X-RAY DIFFRACTION (2.103 Å)