X-group (possible homology)

241 Type III secretory system chaperone-like

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Ligands and drugs

1,533

Member domains

with ligand contacts (≤ 4 Å)

6.3% of members

with DrugDomain annotations

5.7% of members

with a DrugBank compound

3.1% 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 metal compounds	12	8.7	1.38×	q = 0.22
Homogeneous non-metal compounds	7	3.8	1.83×	not tested
Organoheterocyclic compounds	1	2.7	0.37×	not tested
Organic acids and derivatives	1	2.8	0.36×	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
DB02175	MLA	Malonic acid	4
DB08217	MTN	S-[(1-Hydroxy-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-3-yl)methyl] methanesulfonothioate	2
DB01592	—	—	1
DB14488	—	—	1
DB14489	—	—	1
DB14490	—	—	1
DB14491	—	—	1
DB14501	—	—	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CL	CHLORIDE ION	10
CAmetal	CALCIUM ION	9
MGmetal	MAGNESIUM ION	8
MLA	MALONIC ACID	6
COmetal	COBALT (II) ION	3
EU3metal	EUROPIUM (III) ION	3
HGmetal	MERCURY (II) ION	3
ADP	ADENOSINE-5'-DIPHOSPHATE	2
IOD	IODIDE ION	2
Kmetal	POTASSIUM ION	2
MNmetal	MANGANESE (II) ION	2
MTN	S-[(1-oxyl-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-3-yl)methyl] methanesulfonothioate	2
UNL	Unknown ligand	2
ZNmetal	ZINC ION	2
BR	BROMIDE ION	1
CUmetal	COPPER (II) ION	1
NAmetal	SODIUM ION	1
NImetal	NICKEL (II) ION	1
PTmetal	PLATINUM (II) ION	1
UNX	UNKNOWN ATOM OR ION	1