X-group (possible homology)

176 Annexin

Open in classification tree →

Ligands and drugs

1,596

Member domains

516

with ligand contacts (≤ 4 Å)

32.3% of members

293

with DrugDomain annotations

18.4% of members

178

with a DrugBank compound

11.2% 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)

3.9

Superclasses per 20 proteins

narrower than 91% 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	31	15.0	2.07×	q < 0.0001
Homogeneous non-metal compounds	3	6.6	0.46×	q = 0.18
Nucleosides, nucleotides, and analogues	0	8.5	0	q = 2.1e-4
Organic oxygen compounds	0	6.1	0	q = 5.0e-3
Organic nitrogen compounds	1	1.0	1.03×	not tested
Lipids and lipid-like molecules	1	3.4	0.29×	not tested
Organoheterocyclic compounds	1	4.7	0.21×	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
DB00591	—	—	18
DB02929	K21	K201 free base	8
DB09130	—	—	8
DB02497	—	L-Alpha-Glycerophosphorylserine	5
DB02846	—	L-thioproline	4
DB03484	—	—	4
DB03935	—	—	4
DB03959	—	N,O6-Disulfo-Glucosamine	4
DB03981	—	1,4-Dideoxy-5-Dehydro-O2-Sulfo-Glucuronic Acid	4
DB09095	—	—	4
DB11638	—	—	4
DB00288	—	—	2
DB00741	—	Hydrocortisone	2
DB00959	—	—	2
DB01013	—	Clobetasol propionate	2
DB01222	—	—	2
DB01234	—	Dexamethasone	2
DB01380	—	—	2
DB14538	—	—	2
DB14539	—	—	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CAmetal	CALCIUM ION	448
K21	4-[3-{1-(4-BENZYL)PIPERODINYL}PROPIONYL]-7-METHOXY-2,3,4,5-TERTRAHYDRO-1,4-BENZOTHIAZEPINE	8
NAmetal	SODIUM ION	5
CL	CHLORIDE ION	2
N2O	NITROUS OXIDE	2
ZNmetal	ZINC ION	2
ETA	ETHANOLAMINE	1
GPE	L-ALPHA-GLYCEROPHOSPHORYLETHANOLAMINE	1
GSE	L-ALPHA-GLYCEROPHOSPHORYLSERINE	1
MGmetal	MAGNESIUM ION	1
XE	XENON	1