X-group (possible homology)

268 Sterol carrier protein-like

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Ligands and drugs

663

Member domains

142

with ligand contacts (≤ 4 Å)

21.4% of members

150

with DrugDomain annotations

22.6% of members

with a DrugBank compound

12.5% 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)

7.9

Superclasses per 20 proteins

broader than 54% 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 metal compounds	7	10.7	0.66×	q = 0.19
Nucleosides, nucleotides, and analogues	0	6.0	0	q = 3.1e-3
Lipids and lipid-like molecules	13	2.4	5.38×	not tested
Organic nitrogen compounds	1	0.7	1.45×	not tested
Organic oxygen compounds	6	4.3	1.39×	not tested
Benzenoids	2	1.6	1.26×	not tested
Homogeneous non-metal compounds	3	4.7	0.64×	not tested
Organoheterocyclic compounds	2	3.3	0.60×	not tested
Organic acids and derivatives	2	3.4	0.60×	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
DB03796	PLM	Palmitic Acid	11
DB01421	PAR	Paromomycin	6
DB02080	TRT	1-{2-[2-(2-Methoxyethoxy)Ethoxy]Ethoxy}-4-(1,1,3,3-Tetramethylbutyl)Benzene	3
DB00684	TOY	Tobramycin	2
DB03047	EPH	L-Alpha-Phosphatidyl-Beta-Oleoyl-Gamma-Palmitoyl-Phosphatidylethanolamine	2
DB00450	USS	Droperidol	1
DB00502	GMJ	Haloperidol	1
DB00608	CLQ	Chloroquine	1
DB00878	XC9	Chlorhexidine	1
DB01131	XEW	Proguanil	1
DB02736	ACM	Acetamide	1
DB03192	—	(R)-3-hydroxydecanoyl-CoA	1
DB05636	YMZ	(+)-Mefloquine	1
DB06894	1DO	1-Dodecanol	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CL	CHLORIDE ION	16
NAmetal	SODIUM ION	14
PLM	PALMITIC ACID	11
CAmetal	CALCIUM ION	8
PAR	PAROMOMYCIN	6
MGmetal	MAGNESIUM ION	5
P4K	polyethylene glycol	5
ZTP	(2Z,6Z,10Z,14Z,18Z,22Z,26Z)-3,7,11,15,19,23,27,31-octamethyldotriaconta-2,6,10,14,18,22,26,30-octaen-1-yl trihydrogen diphosphate	4
CUmetal	COPPER (II) ION	3
OXN	OXTOXYNOL-10	3
TRT	FRAGMENT OF TRITON X-100	3
E8Q	2-azanylethyl-[(2~{S})-2,3-di(hexadecanoyloxy)propoxy]phosphinic acid	2
EPH	L-ALPHA-PHOSPHATIDYL-BETA-OLEOYL-GAMMA-PALMITOYL-PHOSPHATIDYLETHANOLAMINE	2
LMR	(2S)-2-hydroxybutanedioic acid	2
MVI	Mycinamicin VI	2
TBmetal	TERBIUM(III) ION	2
TOY	TOBRAMYCIN	2
0K3	(2Z,6Z,10Z,14Z,18Z,22Z,26Z)-3,7,11,15,19,23,27,31-octamethyldotriaconta-2,6,10,14,18,22,26,30-octaen-1-yl dihydrogen phosphate	1
5LQ	5-(3-chlorophenyl)-4-methyl-~{N}-(3-morpholin-4-ylpropyl)-1,1-bis(oxidanylidene)-1,2-thiazol-3-amine	1
5LR	5-(4-chlorophenyl)-~{N}-[3-(3,4-dihydro-1~{H}-isoquinolin-2-yl)propyl]-4-methyl-1,1-bis(oxidanylidene)-1,2-thiazol-3-amine	1