X-group (possible homology)

3711 LTXXQ motif family protein

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Ligands and drugs

261

Member domains

with ligand contacts (≤ 4 Å)

20.3% of members

with DrugDomain annotations

20.3% of members

with a DrugBank compound

13.0% 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 nitrogen compounds	1	0.3	3.97×	not tested
Homogeneous non-metal compounds	4	1.7	2.36×	not tested
Homogeneous metal compounds	6	3.9	1.55×	not tested
Organic acids and derivatives	1	1.2	0.82×	not tested
Organic oxygen compounds	1	1.6	0.64×	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
DB00142	GLU	Glutamic acid	2
DB03945	PC	N,N,N-Trimethyl-2-(phosphonooxy)ethanaminium	2
DB09157	CO2	Carbon dioxide	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
ZNmetal	ZINC ION	25
CL	CHLORIDE ION	24
NImetal	NICKEL (II) ION	8
IOD	IODIDE ION	7
CDmetal	CADMIUM ION	6
NAmetal	SODIUM ION	4
CUmetal	COPPER (II) ION	3
COmetal	COBALT (II) ION	2
CO2	CARBON DIOXIDE	2
Kmetal	POTASSIUM ION	2
PC	PHOSPHOCHOLINE	2
GLU	GLUTAMIC ACID	1
MGmetal	MAGNESIUM ION	1
MRD	(4R)-2-METHYLPENTANE-2,4-DIOL	1