X-group (possible homology)

382 Snake toxin-like

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Ligands and drugs

2,167

Member domains

205

with ligand contacts (≤ 4 Å)

9.5% of members

183

with DrugDomain annotations

8.4% of members

153

with a DrugBank compound

7.1% 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)

6.3

Superclasses per 20 proteins

narrower than 72% of the 256 X-groups with enough proteins to compare (median 7.6)

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
Organic oxygen compounds	20	6.5	3.09×	q < 0.0001
Homogeneous non-metal compounds	6	7.0	0.86×	q = 0.88
Homogeneous metal compounds	8	16.0	0.50×	q = 0.01
Organoheterocyclic compounds	2	5.0	0.40×	q = 0.29
Organic acids and derivatives	2	5.0	0.40×	q = 0.29
Nucleosides, nucleotides, and analogues	0	9.0	0	q = 1.3e-4
Organosulfur compounds	3	0.7	4.48×	not tested
Lipids and lipid-like molecules	1	3.6	0.28×	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
DB00141	NAG	N-Acetylglucosamine	76
DB03740	NDG	N-acetyl-alpha-D-glucosamine	3
DB03967	SDS	Dodecyl sulfate	3
DB04349	PGO	(S)-propane-1,2-diol	3
DB00145	GLY	Glycine	2
DB02249	ETX	2-Ethoxyethanol	2
DB04780	SFT	Sulfatide	2
DB05476	—	—	2
DB02580	PG6	Pentaglyme	1
DB12010	—	Fostamatinib	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	71
CL	CHLORIDE ION	15
NAmetal	SODIUM ION	11
ZNmetal	ZINC ION	8
SCN	THIOCYANATE ION	6
CAmetal	CALCIUM ION	4
IOD	IODIDE ION	4
PTmetal	PLATINUM (II) ION	4
NDG	2-acetamido-2-deoxy-alpha-D-glucopyranose	3
NImetal	NICKEL (II) ION	3
PGO	S-1,2-PROPANEDIOL	3
SDS	DODECYL SULFATE	3
CUmetal	COPPER (II) ION	2
Kmetal	POTASSIUM ION	2
QJE	3-[2-[2-[2-[2-[2-(2-azanylethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]propan-1-ol	2
SFT	SULFOGALACTOCERAMIDE	2
1PS	3-PYRIDINIUM-1-YLPROPANE-1-SULFONATE	1
41D	3-[2-(2-hydroxyethyl)pyridinium-1-yl]propane-1-sulfonate	1
ACE	ACETYL GROUP	1
CLR	CHOLESTEROL	1