X-group (possible homology)

3355 dicarboxylate/sodium symporter

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Ligands and drugs

725

Member domains

with ligand contacts (≤ 4 Å)

11.9% of members

with DrugDomain annotations

6.9% of members

with a DrugBank compound

4.1% 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
Hydrocarbons	2	0.0	73×	not tested
Lipids and lipid-like molecules	3	0.4	6.83×	not tested
Benzenoids	1	0.3	3.47×	not tested
Organic acids and derivatives	2	0.6	3.28×	not tested
Organic oxygen compounds	1	0.8	1.27×	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
DB00139	SIN	Succinic acid	12
DB00141	NAG	N-Acetylglucosamine	4
DB02451	BNG	B-nonylglucoside	3
DB01677	FUM	Fumaric acid	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
NAmetal	SODIUM ION	72
SIN	SUCCINIC ACID	12
HEX	HEXANE	7
OCT	N-OCTANE	7
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	6
3PH	1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE	4
CLR	CHOLESTEROL	4
LMR	(2S)-2-hydroxybutanedioic acid	4
PGT	(1S)-2-{[{[(2R)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE	4
PTY	PHOSPHATIDYLETHANOLAMINE	4
UB7	terephthalic acid	4
BNG	nonyl beta-D-glucopyranoside	3
D10	DECANE	3
4DS	4,4'-Diisothiocyano-2,2'-stilbenedisulfonic acid	2
6PE	1,2-DIHEXANOYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE	2
FUM	FUMARIC ACID	2
X3M	(2R)-2-[2-(4-tert-butylphenyl)ethyl]-2-hydroxybutanedioic acid	2
XKC	(2R)-2-hydroxy-2-[2-(2-methoxy-5-methylpyridin-3-yl)ethyl]butanedioic acid	2
8X3	2-hydroxyethylsulfonic acid	1
SLB	N-acetyl-beta-neuraminic acid	1