X-group (possible homology)

838 Ribosomal protein S19

Open in classification tree →

Ligands and drugs

3,318

Member domains

304

with ligand contacts (≤ 4 Å)

9.2% of members

202

with DrugDomain annotations

6.1% of members

with a DrugBank compound

0.2% 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
Mixed metal/non-metal compounds	2	0.2	11×	not tested
Organic acids and derivatives	4	1.4	2.91×	not tested
Homogeneous metal compounds	7	4.4	1.61×	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
DB00120	PHE	Phenylalanine	3
DB00128	ASP	Aspartic acid	2
DB00134	MET	Methionine	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
MGmetal	MAGNESIUM ION	222
OHX	osmium (III) hexammine	80
Kmetal	POTASSIUM ION	2
UNX	UNKNOWN ATOM OR ION	2