X-group (possible homology)

352 Noncollagenous (NC1) domain of collagen IV

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Ligands and drugs

293

Member domains

170

with ligand contacts (≤ 4 Å)

58.0% of members

164

with DrugDomain annotations

56.0% of members

with a DrugBank compound

22.9% 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)

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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 non-metal compounds	8	1.7	4.71×	not tested
Organic oxygen compounds	2	1.6	1.27×	not tested
Homogeneous metal compounds	4	3.9	1.03×	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
CL	CHLORIDE ION	99
Kmetal	POTASSIUM ION	52
BR	BROMIDE ION	24
CAmetal	CALCIUM ION	6
LUmetal	LUTETIUM (III) ION	4
MGmetal	MAGNESIUM ION	4
P6G	HEXAETHYLENE GLYCOL	3