X-group (possible homology)

557 LigA-like domain

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Ligands and drugs

171

Member domains

145

with ligand contacts (≤ 4 Å)

84.8% of members

127

with DrugDomain annotations

74.3% of members

with a DrugBank compound

29.2% 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
Benzenoids	4	0.7	6.17×	not tested
Organic nitrogen compounds	1	0.3	3.53×	not tested
Lipids and lipid-like molecules	2	1.0	2.02×	not tested
Homogeneous metal compounds	8	4.4	1.84×	not tested
Organic acids and derivatives	2	1.4	1.46×	not tested
Homogeneous non-metal compounds	2	1.9	1.05×	not tested
Organic oxygen compounds	1	1.8	0.57×	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
DB09459	TLA	L-tartaric acid	16
DB03568	BUA	Butyric Acid	3
DB03946	DHB	3,4-Dihydroxybenzoic Acid	3
DB02664	BUB	1-Butane Boronic Acid	2
DB01795	PBC	Phenylboronic acid	1
DB02379	BGC	Beta-D-Glucose	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
FEmetal	FE (III) ION	65
3COmetal	COBALT (III) ION	47
COmetal	COBALT (II) ION	17
TLA	L(+)-TARTARIC ACID	12
CL	CHLORIDE ION	11
MGmetal	MAGNESIUM ION	9
NO	NITRIC OXIDE	9
GDE	3,4,5-trihydroxybenzoic acid	8
TAN	2,2-dimethylpropanenitrile	7
FRU	beta-D-fructofuranose	6
TB0	tert-butyl isocyanide	5
BUA	butanoic acid	3
DHB	3,4-DIHYDROXYBENZOIC ACID	3
BUB	1-BUTANE BORONIC ACID	2
CYI	CYCLOHEXYL ISOCYANIDE	2
TAY	2,2-dimethylpropanamide	2
ZNmetal	ZINC ION	2
BGC	beta-D-glucopyranose	1
IBN	2-METHYLPROPAN-1-AMINE	1
O	OXYGEN ATOM	1