X-group (possible homology)

5050 Major facilitator superfamily (MFS) general substrate transporter

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Ligands and drugs

14,852

Member domains

816

with ligand contacts (≤ 4 Å)

5.5% of members

415

with DrugDomain annotations

2.8% of members

237

with a DrugBank compound

1.6% 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)

9.9

Superclasses per 20 proteins

broader than 93% 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 acids and derivatives	12	6.3	1.92×	q = 0.04
Organic oxygen compounds	12	8.1	1.49×	q = 0.17
Organoheterocyclic compounds	9	6.2	1.45×	q = 0.34
Homogeneous metal compounds	11	19.8	0.55×	q = 0.01
Homogeneous non-metal compounds	3	8.7	0.34×	q = 0.06
Nucleosides, nucleotides, and analogues	3	11.2	0.27×	q = 5.4e-3
Alkaloids and derivatives	2	0.1	14×	not tested
Hydrocarbons	2	0.3	7.08×	not tested
Lipids and lipid-like molecules	31	4.5	6.89×	not tested
Phenylpropanoids and polyketides	2	0.8	2.38×	not tested
Benzenoids	4	3.0	1.35×	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
DB02451	BNG	B-nonylglucoside	43
DB02379	BGC	Beta-D-Glucose	18
DB00160	ALA	Alanine	15
DB00119	—	Pyruvic acid	14
DB00141	NAG	N-Acetylglucosamine	11
DB00120	PHE	Phenylalanine	8
DB03619	DXC	Deoxycholic acid	8
DB00446	CLM	Chloramphenicol	6
DB14475	2OP	L-Lactic acid	6
DB16766	5RH	Cytochalasin B	6
DB03556	PE5	2-(2-{2-[2-(2-{2-[2-(2-Ethoxy-Ethoxy)-Ethoxy]-Ethoxy}-Ethoxy)-Ethoxy]-Ethoxy}-Ethoxy)-Ethanol, Polyethyleneglycol Peg400	5
DB00493	—	Cefotaxime	4
DB00583	—	—	4
DB00855	FVT	Aminolevulinic acid	4
DB02024	HCI	3-phenylpropionic acid	4
DB04540	CLR	Cholesterol	4
DB11256	THH	Levomefolic acid	4
DB12529	NO2	Nitrite	4
DB14026	JKE	Thiosalicylic acid	4
DB17692	SZU	Vamifeport	4

Most frequently bound compounds

PDB ligand	Name	Domains in contact
BNG	nonyl beta-D-glucopyranoside	66
78M	(2S)-2,3-DIHYDROXYPROPYL(7Z)-PENTADEC-7-ENOATE	41
OLC	(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate	40
BGC	beta-D-glucopyranose	27
YHR	reserpine	26
78N	(2R)-2,3-DIHYDROXYPROPYL(7Z)-PENTADEC-7-ENOATE	25
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	18
NAmetal	SODIUM ION	15
URC	URIC ACID	15
D10	DECANE	14
D12	DODECANE	14
OCT	N-OCTANE	14
OLA	OLEIC ACID	14
GLC	alpha-D-glucopyranose	12
VIB	3-(4-AMINO-2-METHYL-PYRIMIDIN-5-YLMETHYL)-5-(2-HYDROXY-ETHYL)-4-METHYL-THIAZOL-3-IUM	12
ZGS	[(2~{R})-2-oxidanyl-3-[oxidanyl-[2-(trimethyl-$l^{4}-azanyl)ethoxy]phosphoryl]oxy-propyl] (9~{Z},12~{Z},15~{Z})-octadeca-9,12,15-trienoate	12
CL	CHLORIDE ION	11
SRO	SEROTONIN	11
G6P	6-O-phosphono-alpha-D-glucopyranose	10
Y01	CHOLESTEROL HEMISUCCINATE	10