X-group (possible homology)

4186 Ribosomal protein L21p

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Ligands and drugs

2,384

Member domains

488

with ligand contacts (≤ 4 Å)

20.5% of members

267

with DrugDomain annotations

11.2% of members

with a DrugBank compound

0.8% 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
Homogeneous metal compounds	11	5.3	2.07×	q = 9.3e-4
Mixed metal/non-metal compounds	1	0.2	4.39×	not tested
Nucleosides, nucleotides, and analogues	1	3.0	0.33×	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
DB01972	5GP	Guanosine-5'-Monophosphate	9

Most frequently bound compounds

PDB ligand	Name	Domains in contact
MGmetal	MAGNESIUM ION	461
5GP	GUANOSINE-5'-MONOPHOSPHATE	9
Kmetal	POTASSIUM ION	7
UNX	UNKNOWN ATOM OR ION	2
MNmetal	MANGANESE (II) ION	1
OHX	osmium (III) hexammine	1