X-group (possible homology)

632 immunoglobulin/albumin-binding domain-like

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Ligands and drugs

5,212

Member domains

281

with ligand contacts (≤ 4 Å)

5.4% of members

213

with DrugDomain annotations

4.1% of members

129

with a DrugBank compound

2.5% 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	10	9.2	1.09×	q = 0.88
Nucleosides, nucleotides, and analogues	0	5.2	0	q = 7.4e-3
Phenylpropanoids and polyketides	2	0.4	5.13×	not tested
Organic nitrogen compounds	2	0.6	3.35×	not tested
Organosulfur compounds	1	0.4	2.60×	not tested
Homogeneous non-metal compounds	6	4.0	1.49×	not tested
Organic oxygen compounds	4	3.7	1.07×	not tested
Organoheterocyclic compounds	3	2.9	1.04×	not tested
Benzenoids	1	1.4	0.73×	not tested
Organic acids and derivatives	2	2.9	0.69×	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
DB02034	SWA	Tridolgosir	5
DB03008	GUL	5-fluoro-beta-L-gulosyl fluoride	3
DB02318	FMF	2-deoxy-2-fluoro-alpha-D-mannosyl fluoride	2
DB02492	GHA	Ghavamiol	2
DB02742	KIF	Kifunensine	2
DB03414	LKA	5-Thio-a/B-D-Mannopyranosylamine	2
DB03955	DMJ	1-deoxymannojirimycin	2
DB06984	2SK	(1R,2R,3R,4S,5R)-4-(Benzylamino)-5-(methylthio)cyclopentane-1,2,3-triol	2
DB08321	OEV	(1S,2S,3R,6R)-4-(hydroxymethyl)-6-(octylamino)cyclohex-4-ene-1,2,3-triol	2
DB09130	—	—	2
DB12695	—	—	2
DB00945	—	Acetylsalicylic acid	1
DB01254	—	Dasatinib	1
DB02376	GOX	D-gluconhydroximo-1,5-lactam	1
DB03309	NHE	N-cyclohexyltaurine	1
DB04216	—	Quercetin	1
DB11638	—	—	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
ZNmetal	ZINC ION	113
CL	CHLORIDE ION	8
MGmetal	MAGNESIUM ION	8
MAN	alpha-D-mannopyranose	7
NAmetal	SODIUM ION	7
CAmetal	CALCIUM ION	6
HGmetal	MERCURY (II) ION	4
SWA	1S-8AB-OCTAHYDRO-INDOLIZIDINE-1A,2A,8B-TRIOL	4
BR	BROMIDE ION	3
EYC	2,2'-ethyne-1,2-diylbis{5-[(chloroacetyl)amino]benzenesulfonic acid}	3
D0J	(2R,3R,4R,5S)-2-(hydroxymethyl)-1-{9-[4-(methoxymethyl)-1H-1,2,3-triazol-1-yl]nonyl}piperidine-3,4,5-triol	2
DKA	DECANOIC ACID	2
GLC	alpha-D-glucopyranose	2
GUL	(2R,3S,4R,5S)-2,6-difluoro-2-(hydroxymethyl)oxane-3,4,5-triol	2
IUM	URANYL (VI) ION	2
MSN	(1R,2R,3R,4S,5R)-4-AMINO-5-(METHYLTHIO)CYCLOPENTANE-1,2,3-TRIOL	2
PG0	2-(2-METHOXYETHOXY)ETHANOL	2
SCN	THIOCYANATE ION	2
0ZJ	N-(sulfanylacetyl)-D-phenylalanyl-N-[(2S,3S)-6-{[amino(iminio)methyl]amino}-1-chloro-2-hydroxyhexan-3-yl]-L-prolinamide	1
2SK	(1R,2R,3R,4S,5R)-4-(BENZYLAMINO)-5-(METHYLTHIO)CYCLOPENTANE-1,2,3-TRIOL	1