X-group (possible homology)

258 Methionine synthase activation domain-like

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Ligands and drugs

Member domains

with ligand contacts (≤ 4 Å)

28.3% of members

with DrugDomain annotations

18.9% of members

with a DrugBank compound

15.1% 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	0.25×observed / expected4×	Ratio	Significance
Organoheterocyclic compounds	1	0.2		6.59×	not tested
Nucleosides, nucleotides, and analogues	1	0.3		3.67×	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
DB00118	SAM	Ademetionine	2
DB01752	SAH	S-adenosyl-L-homocysteine	2
DB00115	—	Cyanocobalamin	1
DB00116	—	—	1
DB00134	—	Methionine	1
DB00200	—	—	1
DB01910	SFG	Sinefungin	1
DB03614	—	Mecobalamin	1
DB11590	—	—	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
B12	COBALAMIN	11
SAH	S-ADENOSYL-L-HOMOCYSTEINE	2
SAM	S-ADENOSYLMETHIONINE	2
SFG	SINEFUNGIN	1