X-group (possible homology)

154 Methyl-coenzyme M reductase alpha and beta chain-C

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Ligands and drugs

218

Member domains

150

with ligand contacts (≤ 4 Å)

68.8% of members

130

with DrugDomain annotations

59.6% of members

126

with a DrugBank compound

57.8% 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)

6.0

Superclasses per 20 proteins

narrower than 74% 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
Homogeneous non-metal compounds	4	5.1	0.79×	q = 0.86
Homogeneous metal compounds	5	11.6	0.43×	q = 0.01
Nucleosides, nucleotides, and analogues	0	6.5	0	q = 2.0e-3
Organohalogen compounds	2	0.1	30×	not tested
Organic acids and derivatives	24	3.7	6.55×	not tested
Organoheterocyclic compounds	22	3.6	6.04×	not tested
Organic oxygen compounds	4	4.7	0.85×	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
DB09110	COM	Coenzyme M	122
DB02249	ETX	2-Ethoxyethanol	4

Most frequently bound compounds

PDB ligand	Name	Domains in contact
TP7	Coenzyme B	138
F43	FACTOR 430	136
COM	1-THIOETHANESULFONIC ACID	132
MGmetal	MAGNESIUM ION	35
SHT	O-PHOSPHONO-N-{(2E)-7-[(2-SULFOETHYL)DITHIO]HEPT-2-ENOYL}-L-THREONINE	18
CL	CHLORIDE ION	17
NAmetal	SODIUM ION	13
XE	XENON	12
TXZ	O-phosphono-N-(6-sulfanylhexanoyl)-L-threonine	8
USN	Dimethylated-F430 cofactor	8
M43	(17[2]S)-17[2]-methylthio-coenzyme F43	6
06C	Iodomethane	4
ETX	2-ETHOXYETHANOL	4
Kmetal	POTASSIUM ION	4
TPZ	O-phosphono-N-(5-sulfanylpentanoyl)-L-threonine	4
XP8	O-phosphono-N-(8-sulfanyloctanoyl)-L-threonine	4
XP9	O-phosphono-N-(9-sulfanylnonanoyl)-L-threonine	4
MNmetal	MANGANESE (II) ION	2
CAmetal	CALCIUM ION	1
KR	KRYPTON	1