X-group (possible homology)

4357 WWE domain

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Ligands and drugs

278

Member domains

with ligand contacts (≤ 4 Å)

12.2% of members

with DrugDomain annotations

2.9% of members

with a DrugBank compound

0.7% 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	0.25×observed / expected4×	Ratio	Significance
Nucleosides, nucleotides, and analogues	3	0.8		3.67×	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
DB00171	ATP	ATP	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CL	CHLORIDE ION	14
ADP	ADENOSINE-5'-DIPHOSPHATE	6
ATP	ADENOSINE-5'-TRIPHOSPHATE	5
UNX	UNKNOWN ATOM OR ION	4
V3L	2'-O-(5-O-phosphono-alpha-D-ribofuranosyl)adenosine 5'-(dihydrogen phosphate)	4
APR	ADENOSINE-5-DIPHOSPHORIBOSE	3
YP2	2-(2-hydroxy-2-oxoethyl)-1,3-bis(oxidanylidene)isoindole-5-carboxylic acid	3
51X	(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)acetic acid	2
YGC	[[(2~{R},3~{R},4~{R},5~{R})-5-(6-aminopurin-9-yl)-4-fluoranyl-3-oxidanyl-oxolan-2-yl]methoxy-oxidanyl-phosphoryl] phosphono hydrogen phosphate	2
AR6	[(2R,3S,4R,5R)-5-(6-AMINOPURIN-9-YL)-3,4-DIHYDROXY-OXOLAN-2-YL]METHYL[HYDROXY-[[(2R,3S,4R,5S)-3,4,5-TRIHYDROXYOXOLAN-2-YL]METHOXY]PHOSPHORYL] HYDROGEN PHOSPHATE	1
NAmetal	SODIUM ION	1