X-group (possible homology)

192 Long alpha-hairpin

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Ligands and drugs

14,211

Member domains

1,177

with ligand contacts (≤ 4 Å)

8.3% of members

917

with DrugDomain annotations

6.5% of members

181

with a DrugBank compound

1.3% 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.

103

Proteins with classified ligands

Superclasses bound (of 23)

5.7

Superclasses per 20 proteins

narrower than 77% 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
Homogeneous metal compounds	86	49.9	1.73×	q < 0.0001
Homogeneous non-metal compounds	15	21.9	0.69×	q = 0.17
Lipids and lipid-like molecules	5	11.3	0.44×	q = 0.09
Nucleosides, nucleotides, and analogues	7	28.1	0.25×	q < 0.0001
Benzenoids	1	7.4	0.14×	q = 0.01
Organic oxygen compounds	2	20.2	0.10×	q < 0.0001
Organic acids and derivatives	1	15.7	0.06×	q < 0.0001
Organoheterocyclic compounds	0	15.6	0	q < 0.0001
Mixed metal/non-metal compounds	4	2.1	1.88×	not tested
Hydrocarbons	1	0.7	1.41×	not tested
Organosulfur compounds	2	2.1	0.96×	not tested
Organic nitrogen compounds	2	3.2	0.62×	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
DB02777	PLC	Diundecyl Phosphatidyl Choline	27
DB03345	BME	Mercaptoethanol	24
DB14522	OH	Hydroxide ion	6
DB00171	ATP	ATP	5
DB14128	NAD	Nadide	4
DB03297	PMS	Benzylsulfonic acid	3
DB04022	G4P	Guanosine tetraphosphate	3
DB11091	PEO	Hydrogen peroxide	3
DB16733	—	—	3
DB02210	HEZ	Hexane-1,6-Diol	2
DB03619	DXC	Deoxycholic acid	2
DB04729	LLL	Gentamicin C1a	2
DB00167	—	Isoleucine	1
DB00753	—	Isoflurane	1
DB01189	—	—	1
DB01497	—	—	1
DB01548	—	—	1
DB01565	—	—	1
DB01593	—	—	1
DB02219	CXS	3-(cyclohexylamino)propanesulfonic acid	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
MNmetal	MANGANESE (II) ION	332
MGmetal	MAGNESIUM ION	266
FEmetal	FE (III) ION	189
OHX	osmium (III) hexammine	62
FE2metal	FE (II) ION	46
ZNmetal	ZINC ION	42
Kmetal	POTASSIUM ION	39
PLC	DIUNDECYL PHOSPHATIDYL CHOLINE	29
D10	DECANE	27
BME	BETA-MERCAPTOETHANOL	24
P1O	1,2-DIDECANOYL-SN-GLYCERO-3-PHOSPHOCHOLINE	24
SF4	IRON/SULFUR CLUSTER	21
AZI	AZIDE ION	20
MN3metal	MANGANESE (III) ION	15
CL	CHLORIDE ION	12
3PH	1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE	11
PEO	HYDROGEN PEROXIDE	10
A1A0P	(2R)-3-{[(R)-(2-aminoethoxy)(hydroxy)phosphoryl]oxy}-2-(hexadecanoyloxy)propyl (9Z)-heptadec-9-enoate	9
COmetal	COBALT (II) ION	9
BEZ	BENZOIC ACID	6