X-group (possible homology)

509 PAH2 domain

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Ligands and drugs

445

Member domains

with ligand contacts (≤ 4 Å)

1.8% of members

with DrugDomain annotations

2.0% of members

with a DrugBank compound

1.1% 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
Organic acids and derivatives	1	0.5	2.19×	not tested
Organic oxygen compounds	1	0.6	1.70×	not tested
Homogeneous non-metal compounds	1	0.6	1.57×	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

No DrugBank compounds are annotated on this group's domains.

Most frequently bound compounds

PDB ligand	Name	Domains in contact
2Q5	(2R)-2-{[(2R)-2-{[(2S)-2-{[(2R)-2-hydroxypropyl]oxy}propyl]oxy}propyl]oxy}propan-1-ol	2
8TL	propan-2-yl (3R,6S,9aS)-3-ethyl-8-(3-methylbutyl)-6-(2-methylsulfanylethyl)-4,7-bis(oxidanylidene)-9,9a-dihydro-6H-pyrazino[2,1-c][1,2,4]oxadiazine-1-carboxylate	1
BR	BROMIDE ION	1