X-group (possible homology)

5017 Subunit X (non-heme 7 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)

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Ligands and drugs

370

Member domains

186

with ligand contacts (≤ 4 Å)

50.3% of members

127

with DrugDomain annotations

34.3% of members

with a DrugBank compound

19.7% 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)

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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
Homogeneous metal compounds	0	5.8		0	q = 1.4e-3
Lipids and lipid-like molecules	12	1.3		9.11×	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
DB04327	PEE	Phosphatidylethanolamine	38
DB03429	CDL	Tetrastearoyl cardiolipin	27
DB09114	PCF	Colfosceril palmitate	16
DB01728	PEF	1,2-dihexadecanoyl-sn-glycero-3-phosphoethanolamine	13
DB02686	UMQ	Undecyl-Beta-D-Maltopyranoside	7
DB02144	PIE	1,2-diacyl-sn-glycero-3-phosphoinositol	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
PC1	1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE	77
PEE	1,2-dioleoyl-sn-glycero-3-phosphoethanolamine	61
PTY	PHOSPHATIDYLETHANOLAMINE	43
CDL	CARDIOLIPIN	40
3PE	1,2-Distearoyl-sn-glycerophosphoethanolamine	29
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	22
PCF	1,2-DIACYL-SN-GLYCERO-3-PHOSHOCHOLINE	20
PX4	1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE	9
PEF	DI-PALMITOYL-3-SN-PHOSPHATIDYLETHANOLAMINE	8
UMQ	UNDECYL-MALTOSIDE	7
3PH	1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE	4
PC7	(7S)-4-HYDROXY-N,N,N-TRIMETHYL-9-OXO-7-[(PALMITOYLOXY)METHYL]-3,5,8-TRIOXA-4-PHOSPHAHEXACOSAN-1-AMINIUM 4-OXIDE	4
PLC	DIUNDECYL PHOSPHATIDYL CHOLINE	4
6PH	(1R)-2-(phosphonooxy)-1-[(tridecanoyloxy)methyl]ethyl pentadecanoate	2
7PH	(1R)-2-(dodecanoyloxy)-1-[(phosphonooxy)methyl]ethyl tetradecanoate	2
LOP	(1R)-2-{[(R)-(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(DODECANOYLOXY)METHYL]ETHYL (9Z)-OCTADEC-9-ENOATE	1
MC3	1,2-DIMYRISTOYL-RAC-GLYCERO-3-PHOSPHOCHOLINE	1
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	1
UNL	Unknown ligand	1