X-group (possible homology)

3567 MPER trimer

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Ligands and drugs

3,387

Member domains

1,002

with ligand contacts (≤ 4 Å)

29.6% of members

576

with DrugDomain annotations

17.0% of members

519

with a DrugBank compound

15.3% 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)

5.3

Superclasses per 20 proteins

narrower than 79% 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	42	10.4	4.04×	q < 0.0001
Homogeneous non-metal compounds	7	11.3	0.62×	q = 0.24
Homogeneous metal compounds	5	25.7	0.20×	q < 0.0001
Lipids and lipid-like molecules	1	5.8	0.17×	q = 0.05
Organic acids and derivatives	1	8.1	0.12×	q = 7.0e-3
Organoheterocyclic compounds	1	8.0	0.12×	q = 7.0e-3
Nucleosides, nucleotides, and analogues	0	14.5	0	q < 0.0001
Organic nitrogen compounds	2	1.7	1.20×	not tested
Benzenoids	2	3.8	0.52×	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	460
DB03945	PC	N,N,N-Trimethyl-2-(phosphonooxy)ethanaminium	4
DB04237	TAM	Tris(Hydroxyethyl)Aminomethane	4
DB04473	FUC	alpha-L-fucose	4
DB02210	HEZ	Hexane-1,6-Diol	2
DB03904	URE	Urea	2
DB08357	P4G	Diethylene glycol diethyl ether	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	799
CL	CHLORIDE ION	42
NAmetal	SODIUM ION	19
HEZ	HEXANE-1,6-DIOL	10
UOV	N-(4'-methyl[1,1'-biphenyl]-4-yl)-1-oxa-7-azaspiro[3.5]nonane-7-carboxamide	6
TAM	TRIS(HYDROXYETHYL)AMINOMETHANE	5
BR	BROMIDE ION	4
MGmetal	MAGNESIUM ION	4
PC	PHOSPHOCHOLINE	4
2KN	N,N',N''-triethylbenzene-1,3,5-tricarboxamide	3
BNZ	BENZENE	3
MRD	(4R)-2-METHYLPENTANE-2,4-DIOL	3
N07	[3'-(5-methyl-1,3,4-oxadiazol-2-yl)[1,1'-biphenyl]-3-yl](piperidin-1-yl)methanone	3
NImetal	NICKEL (II) ION	3
QOJ	4,4'-(decane-1,10-diyl)bis(9-amino-2,3-dihydro-1H-cyclopenta[b]quinolin-4-ium)	3
XIG	5-{[(4'-methoxybiphenyl-4-yl)methyl][(1S)-1,2,3,4-tetrahydronaphthalen-1-yl]carbamoyl}benzene-1,2,4-tricarboxylic acid	3
2AN	8-ANILINO-1-NAPHTHALENE SULFONATE	2
ACE	ACETYL GROUP	2
JEF	O-(O-(2-AMINOPROPYL)-O'-(2-METHOXYETHYL)POLYPROPYLENE GLYCOL 500)	2
TYZ	PARA ACETAMIDO BENZOIC ACID	2