X-group (possible homology)

183 Iron-dependent repressor protein, dimerization domain

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Ligands and drugs

193

Member domains

142

with ligand contacts (≤ 4 Å)

73.6% of members

102

with DrugDomain annotations

52.8% of members

with a DrugBank compound

14.5% 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)

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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 metal compounds	11	5.3	2.07×	q = 9.3e-4
Organosulfur compounds	1	0.2	4.48×	not tested
Organic oxygen compounds	1	2.2	0.46×	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
DB03345	BME	Mercaptoethanol	1
DB04349	PGO	(S)-propane-1,2-diol	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
COmetal	COBALT (II) ION	37
MNmetal	MANGANESE (II) ION	32
NImetal	NICKEL (II) ION	24
ZNmetal	ZINC ION	16
CDmetal	CADMIUM ION	11
FE2metal	FE (II) ION	10
CAmetal	CALCIUM ION	2
MGmetal	MAGNESIUM ION	2
BME	BETA-MERCAPTOETHANOL	1
PGO	S-1,2-PROPANEDIOL	1