X-group (possible homology)

5054 Voltage-gated ion channels

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Ligands and drugs

11,470

Member domains

5,240

with ligand contacts (≤ 4 Å)

45.7% of members

2,915

with DrugDomain annotations

25.4% of members

1,207

with a DrugBank compound

10.5% 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.

145

Proteins with classified ligands

Superclasses bound (of 23)

10.4

Superclasses per 20 proteins

broader than 97% 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
Lipids and lipid-like molecules	92	15.9	5.78×	q < 0.0001
Benzenoids	35	10.5	3.35×	q < 0.0001
Organoheterocyclic compounds	26	22.0	1.18×	q = 0.43
Homogeneous metal compounds	82	70.2	1.17×	q = 0.09
Organic acids and derivatives	24	22.1	1.08×	q = 0.72
Organic oxygen compounds	28	28.5	0.98×	q = 1.00
Homogeneous non-metal compounds	9	30.8	0.29×	q < 0.0001
Nucleosides, nucleotides, and analogues	5	39.5	0.13×	q < 0.0001
Hydrocarbons	13	1.0	13×	not tested
Organometallic compounds	1	0.2	4.91×	not tested
Alkaloids and derivatives	2	0.5	4.10×	not tested
Phenylpropanoids and polyketides	7	3.0	2.35×	not tested
Organic nitrogen compounds	7	4.6	1.53×	not tested
Mixed metal/non-metal compounds	4	3.0	1.33×	not tested
Organosulfur compounds	1	2.9	0.34×	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	150
DB04540	CLR	Cholesterol	116
DB00142	GLU	Glutamic acid	93
DB00171	ATP	ATP	84
DB03796	PLM	Palmitic Acid	80
DB12393	ZK1	Fanapanel	69
DB03690	PCW	(Z,Z)-4-Hydroxy-N,N,N-Trimethyl-10-Oxo-7-[(1-Oxo-9-Octadecenyl)Oxy]-3,5,9-Trioxa-4-Phosphaheptacos-18-En-1-Aminium-4-Oxide	65
DB00606	CYZ	Cyclothiazide	64
DB00145	GLY	Glycine	50
DB00201	CFF	Caffeine	44
DB09114	PCF	Colfosceril palmitate	40
DB03143	F09	Nonan-1-Ol	35
DB02306	CPL	Palmitoyl-Linoleoyl Phosphatidylcholine	32
DB06515	6EU	Resiniferatoxin	32
DB03566	SPD	Spermidine	28
DB09061	P0T	Cannabidiol	28
DB00144	P5S	Phosphatidyl serine	24
DB02930	AGS	Adenosine 5'-[gamma-thio]triphosphate	24
DB03429	CDL	Tetrastearoyl cardiolipin	24
DB08883	6ZP	Perampanel	24

Most frequently bound compounds

PDB ligand	Name	Domains in contact
Kmetal	POTASSIUM ION	1,405
CAmetal	CALCIUM ION	863
POV	(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate	681
Y01	CHOLESTEROL HEMISUCCINATE	531
NAmetal	SODIUM ION	462
CLR	CHOLESTEROL	399
ZNmetal	ZINC ION	338
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	257
ATP	ADENOSINE-5'-TRIPHOSPHATE	215
PCW	1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE	189
GLU	GLUTAMIC ACID	160
6OU	[(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyloxy-propan-2-yl] (~{Z})-octadec-9-enoate	159
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	144
PX4	1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE	134
CFF	CAFFEINE	111
3PE	1,2-Distearoyl-sn-glycerophosphoethanolamine	110
9Z9	(3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en	110
6EU	resiniferatoxin	107
PLM	PALMITIC ACID	107
OLC	(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate	97