X-group (possible homology)

5026 PetN subunit of the cytochrome b6f complex

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Ligands and drugs

152

Member domains

with ligand contacts (≤ 4 Å)

15.1% of members

with DrugDomain annotations

13.8% of members

with a DrugBank compound

13.2% 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
Hydrocarbons	2	0.0	58×	not tested
Lipids and lipid-like molecules	5	0.6	9.11×	not tested
Organoheterocyclic compounds	4	0.8	5.27×	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
DB06755	BCR	Beta carotene	17
DB03317	HEC	Ferroheme C	10
DB18267	HEM	Ferroheme	9
DB02686	UMQ	Undecyl-Beta-D-Maltopyranoside	4

Most frequently bound compounds

PDB ligand	Name	Domains in contact
BCR	BETA-CAROTENE	19
OPC	(7R,17E)-4-HYDROXY-N,N,N,7-TETRAMETHYL-7-[(8E)-OCTADEC-8-ENOYLOXY]-10-OXO-3,5,9-TRIOXA-4-PHOSPHAHEPTACOS-17-EN-1-AMINIUM 4-OXIDE	8
HEM	PROTOPORPHYRIN IX CONTAINING FE	7
UMQ	UNDECYL-MALTOSIDE	6
6PL	(4S,7R)-4-HYDROXY-N,N,N-TRIMETHYL-9-OXO-7-[(PALMITOYLOXY)METHYL]-3,5,8-TRIOXA-4-PHOSPHAHEXACOSAN-1-AMINIUM 4-OXIDE	4
ECH	beta,beta-caroten-4-one	4
HEC	HEME C	4
3WM	(1S,8E,1'R,8'Z)-1,1'-{[(2S)-3-hydroxypropane-1,2-diyl]bis(oxy)}bisoctadec-8-en-1-ol	1
7PH	(1R)-2-(dodecanoyloxy)-1-[(phosphonooxy)methyl]ethyl tetradecanoate	1
LMG	1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE	1
OZ2	(2R)-3-{[(R)-{[(2S)-2,3-dihydroxypropyl]oxy}(hydroxy)phosphoryl]oxy}-2-[(6Z)-tridec-6-enoyloxy]propyl (9Z)-octadec-9-enoate	1
TDS	8-HYDROXY-5,7-DIMETHOXY-3-METHYL-2-TRIDECYL-4H-CHROMEN-4-ONE	1