X-group (possible homology)

5057 Neurotransmitter-gated ion-channel transmembrane pore

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Ligands and drugs

3,700

Member domains

1,717

with ligand contacts (≤ 4 Å)

46.4% of members

1,162

with DrugDomain annotations

31.4% of members

617

with a DrugBank compound

16.7% 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)

10.2

Superclasses per 20 proteins

broader than 96% 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
Organoheterocyclic compounds	13	6.1	2.14×	q = 0.01
Homogeneous non-metal compounds	9	8.5	1.06×	q = 0.89
Organic oxygen compounds	7	7.9	0.89×	q = 0.89
Homogeneous metal compounds	4	19.4	0.21×	q < 0.0001
Organic acids and derivatives	1	6.1	0.16×	q = 0.04
Nucleosides, nucleotides, and analogues	0	10.9	0	q < 0.0001
Hydrocarbons	23	0.3	83×	not tested
Miscellaneous inorganic compounds	1	0.0	34×	not tested
Organohalogen compounds	3	0.1	27×	not tested
Lipids and lipid-like molecules	29	4.4	6.60×	not tested
Phenylpropanoids and polyketides	4	0.8	4.88×	not tested
Benzenoids	4	2.9	1.39×	not tested
Organic nitrogen compounds	1	1.3	0.80×	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
DB02777	PLC	Diundecyl Phosphatidyl Choline	207
DB00141	NAG	N-Acetylglucosamine	70
DB03054	MBR	Bromoform	43
DB04540	CLR	Cholesterol	39
DB00818	PFL	Propofol	30
DB02451	BNG	B-nonylglucoside	25
DB11859	Y4B	Brexanolone	24
DB08839	SRO	Serotonin	23
DB00898	—	Ethanol	19
DB01567	—	—	16
DB00470	TCI	Dronabinol	15
DB02686	UMQ	Undecyl-Beta-D-Maltopyranoside	14
DB00377	O7B	Palonosetron	10
DB11371	EY4	Alfaxalone	10
DB12308	P9N	Eltanolone	10
DB00829	DZP	Diazepam	9
DB00241	—	—	7
DB00306	—	—	7
DB00312	—	—	7
DB00418	—	—	7

Most frequently bound compounds

PDB ligand	Name	Domains in contact
PLC	DIUNDECYL PHOSPHATIDYL CHOLINE	242
POV	(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate	226
D10	DECANE	172
OCT	N-OCTANE	167
HEX	HEXANE	162
NAmetal	SODIUM ION	146
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	129
D12	DODECANE	89
PEE	1,2-dioleoyl-sn-glycero-3-phosphoethanolamine	79
CLR	CHOLESTEROL	77
IVM	(2aE,4E,5'S,6S,6'R,7S,8E,11R,13R,15S,17aR,20R,20aR,20bS)-6'-[(2S)-butan-2-yl]-20,20b-dihydroxy-5',6,8,19-tetramethyl-17-oxo-3',4',5',6,6',10,11,14,15,17,17a,20,20a,20b-tetradecahydro-2H,7H-spiro[11,15-methanofuro[4,3,2-pq][2,6]benzodioxacyclooctadecine-13,2'-pyran]-7-yl 2,6-dideoxy-4-O-(2,6-dideoxy-3-O-methyl-alpha-L-arabino-hexopyranosyl)-3-O-methyl-alpha-L-arabino-hexopyranoside	70
PX4	1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE	70
UNL	Unknown ligand	55
CL	CHLORIDE ION	50
9Z9	(3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en	45
Y01	CHOLESTEROL HEMISUCCINATE	39
BNG	nonyl beta-D-glucopyranoside	35
RI5	(1aR,2aR,3S,6R,6aS,8aS,8bR,9R)-2a-hydroxy-8b-methyl-9-(prop-1-en-2-yl)hexahydro-3,6-methano-1,5,7-trioxacyclopenta[ij]cyclopropa[a]azulene-4,8(3H)-dione	35
MBR	TRIBROMOMETHANE	34
PFL	2,6-BIS(1-METHYLETHYL)PHENOL	29