X-group (possible homology)

277 PX domain

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Ligands and drugs

886

Member domains

with ligand contacts (≤ 4 Å)

8.4% of members

with DrugDomain annotations

7.9% of members

with a DrugBank compound

5.6% 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
Homogeneous metal compounds	0	5.3	0	q = 2.5e-3
Lipids and lipid-like molecules	5	1.2	4.14×	not tested
Organic oxygen compounds	4	2.2	1.85×	not tested
Homogeneous non-metal compounds	4	2.3	1.71×	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
DB03556	PE5	2-(2-{2-[2-(2-{2-[2-(2-Ethoxy-Ethoxy)-Ethoxy]-Ethoxy}-Ethoxy)-Ethoxy]-Ethoxy}-Ethoxy)-Ethanol, Polyethyleneglycol Peg400	4
DB00122	—	Choline	1
DB04447	DTT	1,4-Dithiothreitol	1
DB04530	—	—	1
DB14006	—	—	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CL	CHLORIDE ION	13
NAmetal	SODIUM ION	8
PIB	2-(BUTANOYLOXY)-1-{[(HYDROXY{[2,3,4,6-TETRAHYDROXY-5-(PHOSPHONOOXY)CYCLOHEXYL]OXY}PHOSPHORYL)OXY]METHYL}ETHYLBUTANOATE	8
PE5	3,6,9,12,15,18,21,24-OCTAOXAHEXACOSAN-1-OL	4
I35	[(2~{R})-2-butanoyloxy-3-[oxidanyl-[(2~{R},3~{R},5~{S},6~{R})-2,4,6-tris(oxidanyl)-3,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl] butanoate	2
DTT	2,3-DIHYDROXY-1,4-DITHIOBUTANE	1
JEF	O-(O-(2-AMINOPROPYL)-O'-(2-METHOXYETHYL)POLYPROPYLENE GLYCOL 500)	1