X-group (possible homology)

7550 Tetrapyrrole methylase N-terminal domain

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Ligands and drugs

871

Member domains

262

with ligand contacts (≤ 4 Å)

30.1% of members

232

with DrugDomain annotations

26.6% of members

230

with a DrugBank compound

26.4% 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)

5.6

Superclasses per 20 proteins

narrower than 78% 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	2	11.1	0.18×	q = 2.4e-4
Organosulfur compounds	1	0.5	2.14×	not tested
Homogeneous non-metal compounds	5	4.9	1.02×	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
DB04193	HSE	L-Homoserine	1
DB14128	NAD	Nadide	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
SAH	S-ADENOSYL-L-HOMOCYSTEINE	196
SAM	S-ADENOSYLMETHIONINE	23
CL	CHLORIDE ION	8
MGmetal	MAGNESIUM ION	4
PTmetal	PLATINUM (II) ION	4
SFG	SINEFUNGIN	2
F0X	cobalt-sirohydrochlorin	1
HSE	L-HOMOSERINE	1
NAD	NICOTINAMIDE-ADENINE-DINUCLEOTIDE	1
PQ2	3,3',3'',3'''-[(7S,8S,12S,13S)-3,8,13,17-tetrakis(carboxymethyl)-8,13-dimethyl-7,8,12,13,20,24-hexahydroporphyrin-2,7,12,18-tetrayl]tetrapropanoic acid	1
SHN	3,3',3'',3'''-[(7S,8S,12S,13S)-3,8,13,17-tetrakis(carboxymethyl)-8,13-dimethyl-7,8,12,13-tetrahydroporphyrin-2,7,12,18-tetrayl]tetrapropanoic acid	1
UP2	UROPORPHYRINOGEN III	1