X-group (possible homology)

396 CCHC-type 1 zinc finger

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Ligands and drugs

304

Member domains

123

with ligand contacts (≤ 4 Å)

40.5% of members

with DrugDomain annotations

26.6% of members

with a DrugBank compound

2.3% 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)

4.3

Superclasses per 20 proteins

narrower than 89% of the 256 X-groups with enough proteins to compare (median 7.6)

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	31	15.0	2.07×	q < 0.0001
Organic oxygen compounds	2	6.1	0.33×	q = 0.11
Homogeneous non-metal compounds	2	6.6	0.30×	q = 0.07
Nucleosides, nucleotides, and analogues	2	8.5	0.24×	q = 0.01
Organic acids and derivatives	1	4.7	0.21×	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
DB14981	IHP	Phytic acid	4
DB01972	5GP	Guanosine-5'-Monophosphate	1
DB03403	C5P	Cytidine-5'-Monophosphate	1
DB03685	U5P	Uridine monophosphate	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
ZNmetal	ZINC ION	122
IHP	INOSITOL HEXAKISPHOSPHATE	6
IOD	IODIDE ION	3
1HF	(3E)-3-{(2Z)-[(5Z)-5-(furan-2-ylmethylidene)-4-oxo-1,3-thiazolidin-2-ylidene]hydrazinylidene}-2-oxo-2,3-dihydro-1H-indole-5-sulfonic acid	2
CL	CHLORIDE ION	2
UPU	[(2R,3S,4R,5R)-5-(2,4-DIOXO-3,4-DIHYDROPYRIMIDIN-1(2H)-YL)-3,4-DIHYDROXYTETRAHYDROFURAN-2-YL]METHYL (2R,3S,4R,5R)-5-(2,4-DIOXO-3,4-DIHYDROPYRIMIDIN-1(2H)-YL)-4-HYDROXY-2-(HYDROXYMETHYL)TETRAHYDROFURAN-3-YL HYDROGEN (S)-PHOSPHATE	2
5GP	GUANOSINE-5'-MONOPHOSPHATE	1
MNmetal	MANGANESE (II) ION	1