X-group (possible homology)

3937 Connexin 26

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Ligands and drugs

2,095

Member domains

1,009

with ligand contacts (≤ 4 Å)

48.2% of members

431

with DrugDomain annotations

20.6% of members

152

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)

—

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	Ratio	Significance
Homogeneous metal compounds	2	6.3	0.32×	q = 0.04
Hydrocarbons	2	0.1	22×	not tested
Lipids and lipid-like molecules	12	1.4	8.41×	not tested
Benzenoids	1	0.9	1.07×	not tested
Organic oxygen compounds	1	2.6	0.39×	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
DB04327	PEE	Phosphatidylethanolamine	68
DB04540	CLR	Cholesterol	57
DB00141	NAG	N-Acetylglucosamine	14
DB02329	CBO	Carbenoxolone	14
DB02043	LHG	1,2-Dipalmitoyl-Phosphatidyl-Glycerole	12
DB00144	P5S	Phosphatidyl serine	6
DB01136	—	—	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
MC3	1,2-DIMYRISTOYL-RAC-GLYCERO-3-PHOSPHOCHOLINE	408
PTY	PHOSPHATIDYLETHANOLAMINE	272
CLR	CHOLESTEROL	168
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	119
Y01	CHOLESTEROL HEMISUCCINATE	85
PEE	1,2-dioleoyl-sn-glycero-3-phosphoethanolamine	67
C14	TETRADECANE	62
POV	(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate	42
DGA	DIACYL GLYCEROL	35
YMZ	(11R,12S)- Mefloquine	24
LBN	1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine	21
ACD	ARACHIDONIC ACID	12
HE2	HEXAN-1-OL	12
L9Y	4-{[(2S)-2-butyl-6,7-dichloro-2-cyclopentyl-1-oxo-2,3-dihydro-1H-inden-5-yl]oxy}butanoic acid	12
LHG	1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE	12
QDN	Quinidine	12
QI9	Quinine	12
YNJ	7-{[(2S)-2-butyl-6,7-dichloro-2-cyclopentyl-1-oxo-2,3-dihydro-1H-inden-5-yl]oxy}heptanoic acid	11
CAmetal	CALCIUM ION	8
6OU	[(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyloxy-propan-2-yl] (~{Z})-octadec-9-enoate	7