X-group (possible homology)

1137 Tetrapyrrole methylase C-terminal domain-like

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Ligands and drugs

924

Member domains

315

with ligand contacts (≤ 4 Å)

34.1% of members

274

with DrugDomain annotations

29.7% of members

243

with a DrugBank compound

26.3% 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)

4.7

Superclasses per 20 proteins

narrower than 87% of the 256 X-groups with enough proteins to compare (median 7.6)

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
Nucleosides, nucleotides, and analogues	23	6.3	3.67×	q < 0.0001
Homogeneous metal compounds	4	11.1	0.36×	q = 6.3e-3
Homogeneous non-metal compounds	4	4.9	0.82×	not tested
Organoheterocyclic compounds	1	3.5	0.29×	not tested
Organic acids and derivatives	1	3.5	0.28×	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
DB01752	SAH	S-adenosyl-L-homocysteine	176
DB00118	SAM	Ademetionine	20
DB01910	SFG	Sinefungin	2
DB00974	EDT	Edetic acid	1
DB04193	HSE	L-Homoserine	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
SAH	S-ADENOSYL-L-HOMOCYSTEINE	210
NAmetal	SODIUM ION	63
SAM	S-ADENOSYLMETHIONINE	23
ZNmetal	ZINC ION	19
CL	CHLORIDE ION	9
MGmetal	MAGNESIUM ION	6
PTmetal	PLATINUM (II) ION	4
AN6	5'-{[(3S)-3-amino-3-carboxypropyl](ethyl)amino}-5'-deoxyadenosine	2
SFG	SINEFUNGIN	2
EDT	{[-(BIS-CARBOXYMETHYL-AMINO)-ETHYL]-CARBOXYMETHYL-AMINO}-ACETIC ACID	1
F0X	cobalt-sirohydrochlorin	1
HSE	L-HOMOSERINE	1
UP2	UROPORPHYRINOGEN III	1