X-group (possible homology)

719 XRCC4, N-terminal domain-like

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Ligands and drugs

419

Member domains

with ligand contacts (≤ 4 Å)

11.0% of members

with DrugDomain annotations

12.6% of members

with a DrugBank compound

9.1% 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
Mixed metal/non-metal compounds	2	0.1	16×	not tested
Organic nitrogen compounds	2	0.2	11×	not tested
Organic acids and derivatives	1	0.9	1.09×	not tested
Homogeneous metal compounds	3	2.9	1.03×	not tested
Homogeneous non-metal compounds	1	1.3	0.79×	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
DB04119	TBR	Hexatantalum Dodecabromide	8
DB03260	16D	Hexamethylene diamine	7
DB00126	—	Ascorbic acid	2
DB03963	—	—	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
ZNmetal	ZINC ION	19
16D	HEXANE-1,6-DIAMINE	7
TBR	HEXATANTALUM DODECABROMIDE	6
CL	CHLORIDE ION	1