X-group (possible homology)

217 FAD-binding domain-like

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Ligands and drugs

2,222

Member domains

743

with ligand contacts (≤ 4 Å)

33.4% of members

637

with DrugDomain annotations

28.7% of members

615

with a DrugBank compound

27.7% 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)

8.6

Superclasses per 20 proteins

broader than 68% 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
Nucleosides, nucleotides, and analogues	75	22.4	3.36×	q < 0.0001
Benzenoids	8	5.9	1.35×	q = 0.47
Organoheterocyclic compounds	15	12.4	1.21×	q = 0.52
Organic oxygen compounds	18	16.1	1.12×	q = 0.66
Homogeneous non-metal compounds	12	17.4	0.69×	q = 0.24
Lipids and lipid-like molecules	4	9.0	0.44×	q = 0.12
Homogeneous metal compounds	15	39.7	0.38×	q < 0.0001
Organic acids and derivatives	4	12.5	0.32×	q = 0.01
Alkaloids and derivatives	1	0.3	3.62×	not tested
Phenylpropanoids and polyketides	2	1.7	1.19×	not tested
Organic nitrogen compounds	2	2.6	0.78×	not tested
Organosulfur compounds	1	1.7	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
DB03147	FAD	Flavin adenine dinucleotide	592
DB00141	NAG	N-Acetylglucosamine	42
DB09140	OXY	Oxygen	14
DB00157	NAI	NADH	12
DB09086	EOL	Eugenol	10
DB09494	PL3	Cetyl alcohol	7
DB14128	NAD	Nadide	6
DB03461	NAP	Nicotinamide adenine dinucleotide phosphate	5
DB02210	HEZ	Hexane-1,6-Diol	4
DB02676	B3P	2-[3-(2-Hydroxy-1,1-Dihydroxymethyl-Ethylamino)-Propylamino]-2-Hydroxymethyl-Propane-1,3-Diol	4
DB03317	HEC	Ferroheme C	4
DB03610	FCR	4-(trifluoromethyl)phenol	3
DB08768	ZIP	N(6)-dimethylallyladenine	3
DB01688	PCR	P-Cresol	2
DB03066	LAC	D-Lactic acid	2
DB03516	—	Eniluracil	2
DB03556	PE5	2-(2-{2-[2-(2-{2-[2-(2-Ethoxy-Ethoxy)-Ethoxy]-Ethoxy}-Ethoxy)-Ethoxy]-Ethoxy}-Ethoxy)-Ethanol, Polyethyleneglycol Peg400	2
DB03793	BEZ	Benzoic acid	2
DB04096	ABL	(2R,3R,4R,5R)-4,5-Dihydroxy-2-(hydroxymethyl)-6-oxo-3-piperidinyl beta-D-glucopyranoside	2
DB04110	NCR	2-Nitro-4-cresol	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
FAD	FLAVIN-ADENINE DINUCLEOTIDE	701
CL	CHLORIDE ION	43
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	38
CAmetal	CALCIUM ION	24
55B	4-[(1E)-3-hydroxyprop-1-en-1-yl]-2,6-dimethoxyphenol	16
MGmetal	MAGNESIUM ION	16
OXY	OXYGEN MOLECULE	15
EOL	2-methoxy-4-(prop-2-en-1-yl)phenol	14
EUG	2-methoxy-4-[(1E)-prop-1-en-1-yl]phenol	14
B3P	2-[3-(2-HYDROXY-1,1-DIHYDROXYMETHYL-ETHYLAMINO)-PROPYLAMINO]-2-HYDROXYMETHYL-PROPANE-1,3-DIOL	13
NAI	1,4-DIHYDRONICOTINAMIDE ADENINE DINUCLEOTIDE	12
NAmetal	SODIUM ION	10
ZNmetal	ZINC ION	10
Kmetal	POTASSIUM ION	9
H7Y	ISOEUGENOL	8
LAC	LACTIC ACID	8
V55	4-hydroxy-3-methoxybenzaldehyde	8
PL3	HEXADECAN-1-OL	7
NAD	NICOTINAMIDE-ADENINE-DINUCLEOTIDE	6
TIR	TIRANDAMYCIN E	6