X-group (possible homology)

3191 RyR motifs

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Ligands and drugs

1,005

Member domains

with ligand contacts (≤ 4 Å)

7.5% of members

with DrugDomain annotations

5.7% of members

with a DrugBank compound

5.1% 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 non-metal compounds	2	1.1	1.89×	not tested
Nucleosides, nucleotides, and analogues	2	1.4	1.47×	not tested
Organoheterocyclic compounds	1	0.8	1.32×	not tested
Organic acids and derivatives	1	0.8	1.31×	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
DB00201	CFF	Caffeine	6
DB00171	ATP	ATP	3
DB00119	PYR	Pyruvic acid	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
ATP	ADENOSINE-5'-TRIPHOSPHATE	11
CL	CHLORIDE ION	8
KVR	4-[(7-methoxy-2,3-dihydro-1,4-benzothiazepin-4(5H)-yl)methyl]benzoic acid	8
ACP	PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER	6
CFF	CAFFEINE	6
U1C	Dantrolene	4
ANP	PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER	3
A1L7B	Azumolene	2
A1L7G	(2~{S})-4-(naphthalen-2-ylamino)-4-oxidanylidene-2-(3-oxidanylpropylamino)butanoic acid	2
ADP	ADENOSINE-5'-DIPHOSPHATE	2
MGmetal	MAGNESIUM ION	2
PYR	PYRUVIC ACID	2
Kmetal	POTASSIUM ION	1
NAmetal	SODIUM ION	1