X-group (possible homology)

294 CI-2 family of serine protease inhibitors-like

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Ligands and drugs

398

Member domains

with ligand contacts (≤ 4 Å)

10.3% of members

with DrugDomain annotations

9.5% of members

with a DrugBank compound

7.3% 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.

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 non-metal compounds	3	1.9	1.57×	not tested
Organic oxygen compounds	2	1.8	1.13×	not tested
Homogeneous metal compounds	4	4.4	0.92×	not tested
Organic acids and derivatives	1	1.4	0.73×	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	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CL	CHLORIDE ION	4
ZNmetal	ZINC ION	3
EUmetal	EUROPIUM ION	2
15P	POLYETHYLENE GLYCOL (N=34)	1
CAmetal	CALCIUM ION	1
Kmetal	POTASSIUM ION	1
KEF	CEFUROXIME (OCT-3-ENE FORM)	1
NAmetal	SODIUM ION	1
TLA	L(+)-TARTARIC ACID	1