X-group (possible homology)

3861 Mitochondrial translocator protein (TSPO)

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Ligands and drugs

106

Member domains

with ligand contacts (≤ 4 Å)

30.2% of members

with DrugDomain annotations

29.2% of members

with a DrugBank compound

12.3% 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
Lipids and lipid-like molecules	2	0.3	6.07×	not tested
Organoheterocyclic compounds	2	0.5	4.39×	not tested
Organic oxygen compounds	1	0.6	1.70×	not tested
Homogeneous non-metal compounds	1	0.6	1.57×	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
DB02285	PP9	Protoporphyrin	4
DB03831	MPG	[(Z)-octadec-9-enyl] (2R)-2,3-bis(oxidanyl)propanoate	4
DB18267	HEM	Ferroheme	4
DB01178	—	—	1
DB01198	—	—	1
DB03279	LMU	Dodecyl-Alpha-D-Maltoside	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
OLC	(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate	21
MPG	[(Z)-octadec-9-enyl] (2R)-2,3-bis(oxidanyl)propanoate	6
HEM	PROTOPORPHYRIN IX CONTAINING FE	4
PKA	N-[(2R)-butan-2-yl]-1-(2-chlorophenyl)-N-methylisoquinoline-3-carboxamide	4
PP9	PROTOPORPHYRIN IX	4
P6L	(2S)-3-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-2-[(6E)-HEXADEC-6-ENOYLOXY]PROPYL (8E)-OCTADEC-8-ENOATE	3
MH0	Mesoheme	2
OXY	OXYGEN MOLECULE	2
Z0P	(2S)-1-(hexadecanoyloxy)-3-hydroxypropan-2-yl (11Z)-octadec-11-enoate	2
IOD	IODIDE ION	1
LMU	DODECYL-ALPHA-D-MALTOSIDE	1
MOE	METHOXY-ETHOXYL	1
P4C	O-ACETALDEHYDYL-HEXAETHYLENE GLYCOL	1
YZY	(2S)-2-(hexadecanoyloxy)-3-hydroxypropyl (9Z)-octadec-9-enoate	1