X-group (possible homology)

387 omega toxin-like

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Ligands and drugs

5,129

Member domains

326

with ligand contacts (≤ 4 Å)

6.4% of members

269

with DrugDomain annotations

5.2% of members

183

with a DrugBank compound

3.6% 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)

7.0

Superclasses per 20 proteins

narrower than 60% 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
Homogeneous non-metal compounds	11	6.4	1.73×	q = 0.07
Organic oxygen compounds	9	5.9	1.53×	q = 0.23
Homogeneous metal compounds	10	14.5	0.69×	q = 0.15
Nucleosides, nucleotides, and analogues	0	8.2	0	q = 3.4e-4
Organosulfur compounds	1	0.6	1.64×	not tested
Lipids and lipid-like molecules	4	3.3	1.22×	not tested
Organic nitrogen compounds	1	0.9	1.06×	not tested
Organic acids and derivatives	4	4.6	0.87×	not tested
Benzenoids	1	2.2	0.46×	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	16
DB03740	NDG	N-acetyl-alpha-D-glucosamine	11
DB04454	DBB	Alpha-Aminobutyric Acid	6
DB02379	BGC	Beta-D-Glucose	1
DB03766	PPI	Propanoic acid	1
DB09157	CO2	Carbon dioxide	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	40
PIO	[(2R)-2-octanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl] octanoate	38
CL	CHLORIDE ION	20
PA8	1,2-DIOCTANOYL-SN-GLYCERO-3-PHOSPHATE	20
ZNmetal	ZINC ION	13
GYV	2-acetamido-1-O-carbamoyl-2-deoxy-alpha-D-glucopyranose	12
NDG	2-acetamido-2-deoxy-alpha-D-glucopyranose	12
65I	(9R,12R)-15-amino-12-hydroxy-6,12-dioxo-7,11,13-trioxa-12lambda~5~-phosphapentadecan-9-yl undecanoate	8
GYT	BIS-(2-ACETAMIDO-2-DEOXY-ALPHA-D-GLUCOPYRANOSYLOXYCARBONYL)-4,7,10-TRIOXA-1,13-TRIDECANEDIAMINE	8
MAN	alpha-D-mannopyranose	8
NAmetal	SODIUM ION	8
BR	BROMIDE ION	7
I3C	5-amino-2,4,6-triiodobenzene-1,3-dicarboxylic acid	7
MRD	(4R)-2-METHYLPENTANE-2,4-DIOL	7
44E	(2R)-3-(phosphonooxy)propane-1,2-diyl dihexanoate	5
6O9	(2S)-2-(acetyloxy)-3-{[(R)-(2-aminoethoxy)(hydroxy)phosphoryl]oxy}propyl pentanoate	4
6OE	(2S)-3-{[(S)-(2-aminoethoxy)(hydroxy)phosphoryl]oxy}-2-(hexanoyloxy)propyl hexanoate	4
GYU	2-acetamido-2-deoxy-1-O-(propylcarbamoyl)-alpha-D-glucopyranose	4
SCN	THIOCYANATE ION	4
SIA	N-acetyl-alpha-neuraminic acid	4