X-group (possible homology)

358 SRCR-like

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Ligands and drugs

883

Member domains

151

with ligand contacts (≤ 4 Å)

17.1% of members

with DrugDomain annotations

6.3% of members

with a DrugBank compound

5.2% 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 metal compounds	8	5.8	1.38×	q = 0.33
Organic oxygen compounds	6	2.4	2.55×	not tested
Homogeneous non-metal compounds	2	2.6	0.79×	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
DB05389	—	—	9
DB00141	NAG	N-Acetylglucosamine	8
DB01593	—	—	3
DB14487	—	—	3
DB14533	—	—	3
DB09130	—	—	2
DB00522	—	—	1
DB00746	—	Deferoxamine	1
DB01370	—	—	1
DB02235	—	L-methionine (R)-S-oxide	1
DB02709	—	Resveratrol	1
DB03297	—	Benzylsulfonic acid	1
DB03754	—	Tromethamine	1
DB04892	—	—	1
DB05088	—	—	1
DB05938	—	—	1
DB06782	—	—	1
DB09019	—	—	1
DB09148	—	—	1
DB09149	—	—	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	70
CAmetal	CALCIUM ION	69
CL	CHLORIDE ION	12
HEM	PROTOPORPHYRIN IX CONTAINING FE	7
MGmetal	MAGNESIUM ION	5
UNX	UNKNOWN ATOM OR ION	4
BU4	(3R)-butane-1,3-diol	3
CUmetal	COPPER (II) ION	1
TAM	TRIS(HYDROXYETHYL)AMINOMETHANE	1