X-group (possible homology)

295 ssDNA-binding transcriptional regulator domain-like

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Ligands and drugs

685

Member domains

with ligand contacts (≤ 4 Å)

12.3% of members

with DrugDomain annotations

12.1% of members

with a DrugBank compound

7.0% 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
Benzenoids	2	0.7	3.08×	not tested
Homogeneous non-metal compounds	3	1.9	1.57×	not tested
Homogeneous metal compounds	4	4.4	0.92×	not tested
Organoheterocyclic compounds	1	1.4	0.73×	not tested
Nucleosides, nucleotides, and analogues	1	2.5	0.41×	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
DB03434	MPO	3-(N-morpholino)propanesulfonic acid	4
DB04242	PHB	4-hydroxybenzoic acid	4
DB04417	NPO	P-Nitrophenol	4
DB01643	TMP	Thymidine monophosphate	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CL	CHLORIDE ION	15
7DV	2-methylbenzene-1,4-diol	4
H8N	4-hydroxybenzonitrile	4
MGmetal	MAGNESIUM ION	4
MPO	3[N-MORPHOLINO]PROPANE SULFONIC ACID	4
NPO	P-NITROPHENOL	4
PHB	P-HYDROXYBENZOIC ACID	4
NAmetal	SODIUM ION	1
NImetal	NICKEL (II) ION	1
TMP	THYMIDINE-5'-PHOSPHATE	1