X-group (possible homology)

702 beta-hairpin stack

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Ligands and drugs

248

Member domains

with ligand contacts (≤ 4 Å)

25.8% of members

with DrugDomain annotations

25.0% of members

with a DrugBank compound

16.9% 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	4	6.3	0.64×	q = 0.34
Alkaloids and derivatives	1	0.0	23×	not tested
Organic nitrogen compounds	9	0.4	22×	not tested
Organic oxygen compounds	3	2.6	1.18×	not tested
Organic acids and derivatives	2	2.0	1.01×	not tested
Organoheterocyclic compounds	1	2.0	0.51×	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
DB00122	CHT	Choline	27
DB03945	PC	N,N,N-Trimethyl-2-(phosphonooxy)ethanaminium	3
DB00572	OIN	Atropine	2
DB00160	ALA	Alanine	1
DB01912	TPT	2,2':6',2''-Terpyridine Platinum(Ii)	1
DB03034	XED	D-Levofloxacin	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CHT	CHOLINE ION	30
GLC	alpha-D-glucopyranose	6
PC	PHOSPHOCHOLINE	3
OIN	(1R,5S)-8-METHYL-8-AZABICYCLO[3.2.1]OCT-3-YL (2R)-3-HYDROXY-2-PHENYLPROPANOATE	2
ZNmetal	ZINC ION	2
BGC	beta-D-glucopyranose	1
CL	CHLORIDE ION	1
NAmetal	SODIUM ION	1
P6G	HEXAETHYLENE GLYCOL	1
PRmetal	PRASEODYMIUM ION	1
T7K	neutral Yb(III)-caged complex	1
TPT	2,2':6',2''-TERPYRIDINE PLATINUM(II) Chloride	1
TUD	TAUROCHENODEOXYCHOLIC ACID	1
X8M	IPRATROPIUM	1
XED	DEXTROFLOXACINE	1