X-group (possible homology)

4966 inserted helical bundle subdomain in T7 RNA polymerase

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Ligands and drugs

151

Member domains

with ligand contacts (≤ 4 Å)

23.8% of members

with DrugDomain annotations

24.5% of members

with a DrugBank compound

21.2% 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 non-metal compounds	3	0.9	3.53×	not tested
Nucleosides, nucleotides, and analogues	2	1.1	1.83×	not tested
Organic oxygen compounds	1	0.8	1.27×	not tested
Homogeneous metal compounds	1	1.9	0.52×	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
DB02831	2HP	Dihydrogenphosphate	8
DB00171	ATP	ATP	4
DB02596	APC	alpha,beta-Methyleneadenosine 5'-triphosphate	4
DB03896	3PO	Triphosphoric acid	4
DB04137	GTP	Guanosine-5'-Triphosphate	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
MGmetal	MAGNESIUM ION	11
2HP	DIHYDROGENPHOSPHATE ION	8
3PO	TRIPHOSPHATE	4
APC	DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER	4
ATP	ADENOSINE-5'-TRIPHOSPHATE	4
POP	PYROPHOSPHATE 2-	3
S96	(7P)-3-{5-O-[(R)-hydroxy{[(S)-hydroxy(phosphonooxy)phosphoryl]oxy}phosphoryl]-beta-D-ribofuranosyl}-7-(thiophen-2-yl)-3H-imidazo[4,5-b]pyridine	2
CL	CHLORIDE ION	1
HGmetal	MERCURY (II) ION	1
S8L	1-{5-O-[(S)-hydroxy{[(R)-hydroxy(phosphonooxy)phosphoryl]oxy}phosphoryl]-beta-D-ribofuranosyl}-1H-pyrrole-2-carbaldehyde	1