X-group (possible homology)

109 Repetitive alpha hairpins

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Ligands and drugs

81,066

Member domains

9,080

with ligand contacts (≤ 4 Å)

11.2% of members

6,623

with DrugDomain annotations

8.2% of members

4,217

with a DrugBank compound

5.2% 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.

773

Proteins with classified ligands

Superclasses bound (of 23)

9.1

Superclasses per 20 proteins

broader than 82% 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
Organic acids and derivatives	252	117.9	2.14×	q < 0.0001
Organosulfur compounds	26	15.7	1.66×	q = 0.02
Phenylpropanoids and polyketides	25	15.9	1.58×	q = 0.05
Homogeneous non-metal compounds	204	164.0	1.24×	q = 1.4e-3
Benzenoids	60	55.7	1.08×	q = 0.61
Organic nitrogen compounds	26	24.3	1.07×	q = 0.75
Organic oxygen compounds	151	151.8	0.99×	q = 1.00
Lipids and lipid-like molecules	68	84.9	0.80×	q = 0.09
Homogeneous metal compounds	286	374.1	0.76×	q < 0.0001
Hydrocarbons	4	5.3	0.75×	q = 0.88
Organoheterocyclic compounds	88	117.3	0.75×	q = 6.1e-3
Mixed metal/non-metal compounds	4	16.0	0.25×	q = 1.9e-3
Nucleosides, nucleotides, and analogues	43	210.7	0.20×	q < 0.0001
Organic salts	2	0.8	2.52×	not tested
Miscellaneous inorganic compounds	1	0.6	1.76×	not tested
Organic 1,3-dipolar compounds	1	0.6	1.57×	not tested
Organohalogen compounds	2	2.2	0.92×	not tested
Organometallic compounds	1	1.1	0.92×	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
DB00143	GSH	Glutathione	737
DB00141	NAG	N-Acetylglucosamine	198
DB07780	FPP	Farnesyl diphosphate	83
DB08180	MGM	2-[METHYL-(5-GERANYL-4-METHYL-PENT-3-ENYL)-AMINO]-ETHYL-DIPHOSPHATE	74
DB02379	BGC	Beta-D-Glucose	49
DB03003	GTS	Glutathione sulfonic acid	39
DB03310	GDS	Glutathione disulfide	37
DB01780	FSC	Fusicoccin	35
DB03686	GTB	S-(4-nitrobenzyl)glutathione	35
DB14128	NAD	Nadide	32
DB03793	BEZ	Benzoic acid	31
DB14981	IHP	Phytic acid	29
DB03345	BME	Mercaptoethanol	28
DB03401	I3P	1D-myo-inositol 1,4,5-trisphosphate	27
DB02458	GDN	S-(2,4-dinitrophenyl)glutathione	23
DB02676	B3P	2-[3-(2-Hydroxy-1,1-Dihydroxymethyl-Ethylamino)-Propylamino]-2-Hydroxymethyl-Propane-1,3-Diol	23
DB00903	EAA	Etacrynic acid	21
DB04137	GTP	Guanosine-5'-Triphosphate	21
DB01864	GSP	5'-Guanosine-Diphosphate-Monothiophosphate	19
DB00133	SER	Serine	18

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CAmetal	CALCIUM ION	1,291
CL	CHLORIDE ION	915
MGmetal	MAGNESIUM ION	747
GSH	Glutathione	677
ZNmetal	ZINC ION	453
Y01	CHOLESTEROL HEMISUCCINATE	282
NAmetal	SODIUM ION	249
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	227
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	126
PIO	[(2R)-2-octanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl] octanoate	114
FPP	FARNESYL DIPHOSPHATE	89
I3P	D-MYO-INOSITOL-1,4,5-TRIPHOSPHATE	78
POV	(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate	76
MGM	2-[METHYL-(5-GERANYL-4-METHYL-PENT-3-ENYL)-AMINO]-ETHYL-DIPHOSPHATE	72
IHP	INOSITOL HEXAKISPHOSPHATE	69
CLR	CHOLESTEROL	68
GTX	S-HEXYLGLUTATHIONE	68
Kmetal	POTASSIUM ION	59
YBmetal	YTTERBIUM (III) ION	59
UNX	UNKNOWN ATOM OR ION	56