X-group (possible homology)

5040 Cytochrome c oxidase subunit II-like, transmembrane region

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Ligands and drugs

740

Member domains

357

with ligand contacts (≤ 4 Å)

48.2% of members

261

with DrugDomain annotations

35.3% of members

152

with a DrugBank compound

20.5% 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	Ratio	Significance
Homogeneous metal compounds	3	5.8	0.52×	q = 0.21
Hydrocarbons	4	0.1	48×	not tested
Lipids and lipid-like molecules	12	1.3	9.11×	not tested
Organoheterocyclic compounds	1	1.8	0.55×	not tested
Organic oxygen compounds	1	2.4	0.42×	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
DB03429	CDL	Tetrastearoyl cardiolipin	123
DB02659	CHD	Cholic Acid	122
DB01728	PEF	1,2-dihexadecanoyl-sn-glycero-3-phosphoethanolamine	11
DB09114	PCF	Colfosceril palmitate	2
DB03317	HEC	Ferroheme C	1
DB03619	DXC	Deoxycholic acid	1
DB04464	—	N-Formylmethionine	1
DB05412	—	Talmapimod	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
HEA	HEME-A	301
CDL	CARDIOLIPIN	156
CHD	CHOLIC ACID	144
PSC	(7R,17E,20E)-4-HYDROXY-N,N,N-TRIMETHYL-9-OXO-7-[(PALMITOYLOXY)METHYL]-3,5,8-TRIOXA-4-PHOSPHAHEXACOSA-17,20-DIEN-1-AMINIUM 4-OXIDE	131
TGL	TRISTEAROYLGLYCEROL	124
PEK	(1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(STEAROYLOXY)METHYL]ETHYL (5E,8E,11E,14E)-ICOSA-5,8,11,14-TETRAENOATE	107
DMU	DECYL-BETA-D-MALTOPYRANOSIDE	53
TRD	TRIDECANE	26
3PE	1,2-Distearoyl-sn-glycerophosphoethanolamine	23
LFA	EICOSANE	22
OLC	(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate	21
CDmetal	CADMIUM ION	18
HEO	HEME O	16
PEF	DI-PALMITOYL-3-SN-PHOSPHATIDYLETHANOLAMINE	12
PTY	PHOSPHATIDYLETHANOLAMINE	11
HAS	HEME-AS	10
PGV	(1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE	8
PC1	1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE	7
PLX	(9R,11S)-9-({[(1S)-1-HYDROXYHEXADECYL]OXY}METHYL)-2,2-DIMETHYL-5,7,10-TRIOXA-2LAMBDA~5~-AZA-6LAMBDA~5~-PHOSPHAOCTACOSANE-6,6,11-TRIOL	6
XE	XENON	6