X-group (possible homology)

4983 Indoleamine 2,3-dioxygenase N-terminal subdomain

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Ligands and drugs

272

Member domains

with ligand contacts (≤ 4 Å)

30.5% of members

with DrugDomain annotations

15.4% of members

with a DrugBank compound

12.1% of members

Aggregated over all current member domains of this group. Drug annotations come from DrugDomain; buffers and crystallization additives are excluded from the tables below.

Chemical profile

ClassyFire chemical superclasses of the ligands bound by this X-group's proteins, from DrugDomain annotations.

Proteins with classified ligands

Superclasses bound (of 23)

—

Superclasses per 20 proteins

fewer than 20 proteins: too few to compare at equal depth

The raw number of superclasses rises with the number of proteins sampled; the per-20 value compares X-groups at equal depth.

Superclass	Proteins	Expected	Ratio	Significance
Benzenoids	1	0.1	14×	not tested
Organoheterocyclic compounds	1	0.2	6.59×	not tested
Organic oxygen compounds	1	0.2	5.09×	not tested
Homogeneous non-metal compounds	1	0.2	4.71×	not tested

enriched (q < 0.05)depleted (q < 0.05)not significantnot tested (expected < 5)

Unit: a protein (UniProt accession) with a ligand-binding domain in this X-group, counted once per superclass. Expected counts use each superclass's frequency across all ligand-binding X-groups; significance is Fisher's exact test with Benjamini–Hochberg correction. Buffers and crystallization additives are excluded. ECOD v295.2; the method follows the ECOD 2027 update, whose published figures used a slightly different artifact filter.

DrugBank compounds

DrugBank	PDB ligand	Name	Domains
DB02070	KYN	Kynurenine	3
DB00150	TRP	Tryptophan	1
DB00435	—	—	1
DB09061	—	Cannabidiol	1
DB14011	—	—	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
HEM	PROTOPORPHYRIN IX CONTAINING FE	14
NFK	N'-Formylkynurenine	5
A1H93	(R)-[1-[2,5-bis(fluoranyl)-4-methoxy-phenyl]-1,2,3-triazol-4-yl]-(6-cyclopropylimidazo[1,5-a]pyrazin-5-yl)methanol	4
CL	CHLORIDE ION	4
HQJ	4-(3-chlorophenyl)-1H-imidazole	4
KYN	(2S)-2-amino-4-(2-aminophenyl)-4-oxobutanoic acid	3
A1H60	(~{R})-(2-cyclopropylimidazo[5,1-b][1,3]thiazol-3-yl)-(1-phenyl-1,2,3-triazol-4-yl)methanol	2
A1H6R	(~{S})-[(7~{a}~{R})-2-cyclopentyl-5,6,7,7~{a}-tetrahydroimidazo[5,1-b][1,3]thiazol-3-yl]-cyclohexyl-methanol	2
A1H6T	(~{R})-(6-chloranylimidazo[1,5-a]pyridin-5-yl)-(1-phenyl-1,2,3-triazol-4-yl)methanol	2
A1H6U	(~{S})-cyclohexyl(imidazo[1,5-a]pyridin-5-yl)methanol	2
A1H6V	(~{R})-(2-cyclopropylimidazo[5,1-b][1,3]thiazol-3-yl)-[1-(1~{H}-indol-5-yl)-1,2,3-triazol-4-yl]methanol	2
TRP	TRYPTOPHAN	2
A1JLA	2-[4-[[(1~{R},2~{S},6~{S},8~{R})-2-[(4-ethynylphenyl)carbamoyloxymethyl]-9,9-dimethyl-4-azatricyclo[6.1.1.0^{2,6}]decan-4-yl]sulfonyl]-3-methyl-phenyl]-2-methyl-propanoic acid	1
A1JLB	2-[4-[[(1~{R},2~{R},6~{S},8~{R})-2-[3-[(4-ethynylphenyl)amino]-3-oxidanylidene-propyl]-9,9-dimethyl-4-azatricyclo[6.1.1.0^{2,6}]decan-4-yl]sulfonyl]phenyl]-2-methyl-propanoic acid	1
A1JLD	[(1~{R},2~{S},6~{S},8~{R})-4-(4-~{tert}-butyl-2-methyl-phenyl)sulfonyl-9,9-dimethyl-4-azatricyclo[6.1.1.0^{2,6}]decan-2-yl]methyl ~{N}-(4-ethynylphenyl)carbamate	1
A1JLE	[(1~{R},2~{S},6~{S},8~{R})-4-(4-~{tert}-butylphenyl)sulfonyl-9,9-dimethyl-4-azatricyclo[6.1.1.0^{2,6}]decan-2-yl]methyl ~{N}-(4-ethynylphenyl)carbamate	1