X-group (possible homology)

151 Hemocyanin-N

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Ligands and drugs

160

Member domains

with ligand contacts (≤ 4 Å)

18.1% of members

with DrugDomain annotations

11.3% of members

with a DrugBank compound

7.5% 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 non-metal compounds	2	1.1	1.89×	not tested
Organoheterocyclic compounds	1	0.8	1.32×	not tested
Organic acids and derivatives	1	0.8	1.31×	not tested
Homogeneous metal compounds	3	2.4	1.24×	not tested
Organic oxygen compounds	1	1.0	1.02×	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
DB00145	GLY	Glycine	3
DB00141	NAG	N-Acetylglucosamine	2
DB09140	OXY	Oxygen	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CUmetal	COPPER (II) ION	12
CL	CHLORIDE ION	8
GLY	GLYCINE	3
CUO	CU2-O2 CLUSTER	2
MGmetal	MAGNESIUM ION	2
NAmetal	SODIUM ION	1
OXY	OXYGEN MOLECULE	1
PER	PEROXIDE ION	1