X-group (possible homology)

7575 Caspase-like

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Ligands and drugs

1,764

Member domains

410

with ligand contacts (≤ 4 Å)

23.2% of members

366

with DrugDomain annotations

20.7% of members

192

with a DrugBank compound

10.9% 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)

7.0

Superclasses per 20 proteins

narrower than 60% 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 non-metal compounds	10	5.1	1.96×	q = 0.04
Homogeneous metal compounds	12	11.6	1.03×	q = 1.00
Nucleosides, nucleotides, and analogues	2	6.5	0.31×	q = 0.06
Benzenoids	7	1.7	4.05×	not tested
Organic oxygen compounds	13	4.7	2.76×	not tested
Organic acids and derivatives	9	3.7	2.46×	not tested
Organoheterocyclic compounds	7	3.6	1.92×	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
DB00141	NAG	N-Acetylglucosamine	49
DB14981	IHP	Phytic acid	14
DB04447	DTT	1,4-Dithiothreitol	12
DB01822	DTD	(4R,5R)-1,2-dithiane-4,5-diol	3
DB05408	—	—	3
DB06255	—	—	3
DB00172	PRO	Proline	2
DB00282	—	Pamidronic acid	2
DB00945	—	Acetylsalicylic acid	2
DB01017	—	Minocycline	2
DB03124	161	5-[4-(1-Carboxymethyl-2-Oxo-Propylcarbamoyl)-Benzylsulfamoyl]-2-Hydroxy-Benzoic Acid	2
DB03384	FXN	Fica	2
DB04137	GTP	Guanosine-5'-Triphosphate	2
DB04315	GDP	Guanosine-5'-Diphosphate	2
DB07696	DZE	methyl (3S)-3-[(tert-butoxycarbonyl)amino]-4-oxopentanoate	2
DB08251	NA4	4-[5-(2-CARBOXY-1-FORMYL-ETHYLCARBAMOYL)-PYRIDIN-3-YL]-BENZOIC ACID	2
DB08497	RXB	(1S)-2-oxo-1-phenyl-2-[(1,3,4-trioxo-1,2,3,4-tetrahydroisoquinolin-5-yl)amino]ethyl acetate	2
DB08498	RXC	(1S)-1-(3-chlorophenyl)-2-oxo-2-[(1,3,4-trioxo-1,2,3,4-tetrahydroisoquinolin-5-yl)amino]ethyl acetate	2
DB08499	RXD	N-[3-(2-fluoroethoxy)phenyl]-N'-(1,3,4-trioxo-1,2,3,4-tetrahydroisoquinolin-6-yl)butanediamide	2
DB12843	—	—	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
NAmetal	SODIUM ION	52
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	46
CL	CHLORIDE ION	41
AZI	AZIDE ION	35
CAmetal	CALCIUM ION	19
IHP	INOSITOL HEXAKISPHOSPHATE	19
ZNmetal	ZINC ION	16
WSN	N-[(2R)-4-amino-1-imino-4-oxobutan-2-yl]-1-(1-{4-[(2,4-difluorophenyl)methoxy]phenyl}cyclopropane-1-carbonyl)-L-prolinamide	14
DTT	2,3-DIHYDROXY-1,4-DITHIOBUTANE	12
MRD	(4R)-2-METHYLPENTANE-2,4-DIOL	10
MGmetal	MAGNESIUM ION	8
UCI	(3R,5S)-1-(ethanesulfonyl)-5-phenyl-N-[4-(trifluoromethoxy)phenyl]piperidine-3-carboxamide (bound form)	8
US9	(3R)-1-(ethanesulfonyl)-N-[4-(trifluoromethoxy)phenyl]piperidine-3-carboxamide	8
2GQ	3-(pyrrolidin-1-yl)isoquinolin-1(2H)-one	6
DTD	DITHIANE DIOL	5
A1AAB	N-{7-[(1S)-1-methoxyethyl]-2-methyl[1,3]thiazolo[5,4-b]pyridin-6-yl}-N'-[6-(2H-1,2,3-triazol-2-yl)-5-(trifluoromethyl)pyridin-3-yl]urea	4
AZ0	ethyl (5S,8S,14S)-14-hydroxy-5,8,11-tris(2-methylpropyl)-3,6,9,12-tetraoxo-1-phenyl-2-oxa-4,7,10,11-tetraazapentadecan-15-oate	4
BAmetal	BARIUM ION	4
WS9	N-[(1E,3R)-5-amino-1-(1,3-oxazol-2-yl)-5-oxopent-1-en-3-yl]-1-{1-[4-(trifluoromethoxy)phenyl]cyclopropane-1-carbonyl}-L-prolinamide	4
158	3-(2-MERCAPTO-ACETYLAMINO)-4-OXO-PENTANOIC ACID	3