X-group (possible homology)

331 TBP-like

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Ligands and drugs

7,596

Member domains

1,254

with ligand contacts (≤ 4 Å)

16.5% of members

1,119

with DrugDomain annotations

14.7% of members

656

with a DrugBank compound

8.6% 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.

148

Proteins with classified ligands

Superclasses bound (of 23)

9.3

Superclasses per 20 proteins

broader than 85% 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
Benzenoids	36	10.7	3.37×	q < 0.0001
Lipids and lipid-like molecules	40	16.3	2.46×	q < 0.0001
Organoheterocyclic compounds	29	22.5	1.29×	q = 0.19
Homogeneous non-metal compounds	36	31.4	1.15×	q = 0.44
Organic oxygen compounds	29	29.1	1.00×	q = 1.00
Homogeneous metal compounds	60	71.6	0.84×	q = 0.09
Organic acids and derivatives	7	22.6	0.31×	q = 2.6e-4
Nucleosides, nucleotides, and analogues	4	40.3	0.10×	q < 0.0001
Alkaloids and derivatives	2	0.5	4.01×	not tested
Phenylpropanoids and polyketides	6	3.0	1.98×	not tested
Organic nitrogen compounds	7	4.7	1.50×	not tested
Organosulfur compounds	3	3.0	1.00×	not tested
Hydrocarbons	1	1.0	0.98×	not tested
Mixed metal/non-metal compounds	2	3.1	0.65×	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
DB04474	2AN	8-anilinonaphthalene-1-sulfonic acid	89
DB16829	A8S	Abscisic Acid	44
DB09140	OXY	Oxygen	21
DB07301	9CA	Carbazole	17
DB02648	152	(3-Carboxy-2-(R)-Hydroxy-Propyl)-Trimethyl-Ammonium	13
DB01917	PUT	Putrescine	11
DB11337	ZEA	Zeatin	11
DB12039	28E	Epicatechin	11
DB02835	G16	Alpha-D-Glucose 1,6-Bisphosphate	10
DB02843	G1P	alpha-D-glucose-1-phosphate	7
DB12010	—	Fostamatinib	7
DB00201	CFF	Caffeine	6
DB02007	G6P	alpha-D-glucose 6-phosphate	6
DB02219	CXS	3-(cyclohexylamino)propanesulfonic acid	6
DB04532	IND	Indole	6
DB04705	HC3	25-Hydroxycholesterol	6
DB04745	OCH	2-Hydroxyquinoline	6
DB14086	KXN	Cianidanol	6
DB14756	SRT	meso-Tartaric acid	6
DB02676	B3P	2-[3-(2-Hydroxy-1,1-Dihydroxymethyl-Ethylamino)-Propylamino]-2-Hydroxymethyl-Propane-1,3-Diol	5

Most frequently bound compounds

PDB ligand	Name	Domains in contact
FE2metal	FE (II) ION	211
FEmetal	FE (III) ION	174
2AN	8-ANILINO-1-NAPHTHALENE SULFONATE	89
CL	CHLORIDE ION	71
NAmetal	SODIUM ION	65
A8S	(2Z,4E)-5-[(1S)-1-hydroxy-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl]-3-methylpenta-2,4-dienoic acid	52
PUT	1,4-DIAMINOBUTANE	38
PYV	4-bromo-N-(pyridin-2-ylmethyl)naphthalene-1-sulfonamide	30
BNL	BIPHENYL	28
PYR	PYRUVIC ACID	22
OXY	OXYGEN MOLECULE	21
MGmetal	MAGNESIUM ION	19
9CA	9H-CARBAZOLE	17
UNL	Unknown ligand	17
CAmetal	CALCIUM ION	14
152	CARNITINE	13
SCN	THIOCYANATE ION	13
COmetal	COBALT (II) ION	12
QKQ	~{N}-(3-imidazol-1-ylpropyl)-8-(4-methoxyphenyl)-1,6-naphthyridine-2-carboxamide	12
SMM	S-ADENOSYLMETHIONINE METHYL ESTER	12