X-group (possible homology)

4104 EscU C-terminal domain-like

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Ligands and drugs

112

Member domains

with ligand contacts (≤ 4 Å)

24.1% of members

with DrugDomain annotations

14.3% of members

with a DrugBank compound

9.8% 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
Organic acids and derivatives	3	0.8	3.93×	not tested
Homogeneous non-metal compounds	3	1.1	2.83×	not tested
Organoheterocyclic compounds	1	0.8	1.32×	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
DB00151	CYS	Cysteine	3
DB00139	SIN	Succinic acid	1
DB00172	PRO	Proline	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CL	CHLORIDE ION	6
CYS	CYSTEINE	6
NAmetal	SODIUM ION	6
PRO	PROLINE	3
B8E	methyl 2-(5-methyl-2-phenyl-1,3-thiazol-4-yl)ethanoate	2
SIN	SUCCINIC ACID	1
ZNmetal	ZINC ION	1