X-group (possible homology)

3916 Helical domain in PB2

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Ligands and drugs

137

Member domains

with ligand contacts (≤ 4 Å)

18.2% of members

with DrugDomain annotations

11.7% of members

with a DrugBank compound

7.3% 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)

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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	0.25×observed / expected4×	Ratio	Significance
Nucleosides, nucleotides, and analogues	2	0.6		3.67×	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
DB01649	GTA	7-methyl-GpppA	7

Most frequently bound compounds

PDB ligand	Name	Domains in contact
GTA	P1-7-METHYLGUANOSINE-P3-ADENOSINE-5',5'-TRIPHOSPHATE	7
21G	(2S,3S)-3-[[5-fluoranyl-2-(5-fluoranyl-1H-pyrrolo[2,3-b]pyridin-3-yl)pyrimidin-4-yl]amino]bicyclo[2.2.2]octane-2-carboxylic acid	4
G1G	7-METHYL-GUANOSINE-5'-TRIPHOSPHATE-5'-(2'-O-METHYL)-GUANOSINE	2
MGT	7N-METHYL-8-HYDROGUANOSINE-5'-TRIPHOSPHATE	2