X-group (possible homology)

4039 Beta-strand domain in eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment

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Ligands and drugs

Member domains

with ligand contacts (≤ 4 Å)

12.9% of members

with DrugDomain annotations

11.4% of members

with a DrugBank compound

8.6% 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
Alkaloids and derivatives	1	0.0	149×	not tested
Organoheterocyclic compounds	1	0.3	3.29×	not tested
Homogeneous non-metal compounds	1	0.4	2.36×	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
DB01030	TTC	Topotecan	3
DB04690	EHD	Camptothecin	1
DB07354	AI3	2,3-DIMETHOXY-12H-[1,3]DIOXOLO[5,6]INDENO[1,2-C]ISOQUINOLIN-6-IUM	1
DB08159	M38	4-(5,11-DIOXO-5H-INDENO[1,2-C]ISOQUINOLIN-6(11H)-YL)BUTANOATE	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
TTG	2-(1-DIMETHYLAMINOMETHYL-2-HYDROXY-8-HYDROXYMETHYL-9-OXO-9,11-DIHYDRO-INDOLIZINO[1,2-B]QUINOLIN-7-YL)-2-HYDROXY-BUTYRIC ACID	3
CL	CHLORIDE ION	2
AI3	2,3-DIMETHOXY-12H-[1,3]DIOXOLO[5,6]INDENO[1,2-C]ISOQUINOLIN-6-IUM	1
EHD	4-ETHYL-4-HYDROXY-1,12-DIHYDRO-4H-2-OXA-6,12A-DIAZA-DIBENZO[B,H]FLUORENE-3,13-DIONE	1
M38	4-(5,11-DIOXO-5H-INDENO[1,2-C]ISOQUINOLIN-6(11H)-YL)BUTANOATE	1
SA3	2,10-DIHYDROXY-12-(BETA-D-GLUCOPYRANOSYL)-6,7,12,13-TETRAHYDROINDOLO[2,3-A]PYRROLO[3,4-C]CARBAZOLE-5,7-DIONE	1
TTC	(S)-10-[(DIMETHYLAMINO)METHYL]-4-ETHYL-4,9-DIHYDROXY-1H-PYRANO[3',4':6,7]INOLIZINO[1,2-B]-QUINOLINE-3,14(4H,12H)-DIONE	1