X-group (possible homology)

859 The spindle assembly checkpoint protein mad2

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Ligands and drugs

416

Member domains

with ligand contacts (≤ 4 Å)

11.3% of members

with DrugDomain annotations

11.1% of members

with a DrugBank compound

6.7% 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)

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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
Organosulfur compounds	1	0.1	9.86×	not tested
Organic nitrogen compounds	1	0.2	6.36×	not tested
Benzenoids	2	0.4	5.55×	not tested
Homogeneous non-metal compounds	2	1.1	1.89×	not tested
Homogeneous metal compounds	2	2.4	0.83×	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
DB02219	CXS	3-(cyclohexylamino)propanesulfonic acid	1
DB03345	BME	Mercaptoethanol	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CL	CHLORIDE ION	15
MGmetal	MAGNESIUM ION	8
BEN	BENZAMIDINE	2
BME	BETA-MERCAPTOETHANOL	1
CXS	3-CYCLOHEXYL-1-PROPYLSULFONIC ACID	1
NImetal	NICKEL (II) ION	1