X-group (possible homology)

3694 Tail specific protease helical domain

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Ligands and drugs

232

Member domains

with ligand contacts (≤ 4 Å)

9.1% of members

with DrugDomain annotations

9.5% of members

with a DrugBank compound

7.8% 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
Organic acids and derivatives	2	0.8	2.62×	not tested
Lipids and lipid-like molecules	1	0.6	1.82×	not tested
Organic oxygen compounds	1	1.0	1.02×	not tested
Homogeneous non-metal compounds	1	1.1	0.94×	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
DB01984	DKT	(4S)-5-[[(1S)-1-Carboxy-2-cyclohexylethyl]amino]-4-[[(2S)-2-[[(3R)-4-cyclohexyl-2-oxo-3-(phenylmethoxycarbonylamino)butanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-5-oxopentanoic acid	6
DB11948	—	—	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
DKT	4-[2-(3-BENZYLOXYCARBONYLAMINO-4-CYCLOHEXYL-1-HYDROXY-2-OXO-BUTYLAMINO)-5-GUANIDINO-PENTANOYLAMINO]-4-(1-CARBOXY-2-CYCLOHEXYL-ETHYLCARBAMOYL)-BUTYRIC ACID	6
CL	CHLORIDE ION	2
LAS	N-acetyl-S-({(2R,3S,4R)-3-hydroxy-2-[(1S)-1-hydroxy-2-methylpropyl]-4-methyl-5-oxopyrrolidin-2-yl}carbonyl)cysteine	2
MRD	(4R)-2-METHYLPENTANE-2,4-DIOL	1
OLA	OLEIC ACID	1