X-group (possible homology)

7501 Dihydrofolate reductases

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Ligands and drugs

1,496

Member domains

1,180

with ligand contacts (≤ 4 Å)

78.9% of members

1,098

with DrugDomain annotations

73.4% of members

1,031

with a DrugBank compound

68.9% 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)

9.2

Superclasses per 20 proteins

broader than 84% 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	33	5.7	5.79×	q < 0.0001
Nucleosides, nucleotides, and analogues	74	21.5	3.44×	q < 0.0001
Organoheterocyclic compounds	36	12.0	3.00×	q < 0.0001
Organic acids and derivatives	34	12.1	2.82×	q < 0.0001
Homogeneous non-metal compounds	20	16.8	1.19×	q = 0.49
Homogeneous metal compounds	20	38.2	0.52×	q = 1.2e-4
Organic oxygen compounds	5	15.5	0.32×	q = 3.6e-3
Lipids and lipid-like molecules	0	8.7	0	q = 5.5e-4
Phenylpropanoids and polyketides	12	1.6	7.41×	not tested
Organic nitrogen compounds	5	2.5	2.01×	not tested
Organosulfur compounds	2	1.6	1.25×	not tested
Mixed metal/non-metal compounds	1	1.6	0.61×	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
DB02338	NDP	NADPH	532
DB03461	NAP	Nicotinamide adenine dinucleotide phosphate	340
DB00158	FOL	Folic acid	150
DB00563	MTX	Methotrexate	145
DB00440	TOP	Trimethoprim	54
DB00205	CP6	Pyrimethamine	25
DB03345	BME	Mercaptoethanol	23
DB02015	DHF	Dihydrofolic Acid	20
DB14763	1CY	Cycloguanil	16
DB01157	TMQ	Trimetrexate	15
DB08234	N22	5-[3-(2,5-dimethoxyphenyl)prop-1-yn-1-yl]-6-ethylpyrimidine-2,4-diamine	11
DB02363	ATR	2'-Monophosphoadenosine-5'-Diphosphate	9
DB02031	THG	(6S)-5,6,7,8-tetrahydrofolic acid	8
DB08878	04J	Aminopterin	8
DB12769	DDF	Lometrexol	8
DB07153	55V	6-methyl-5-[3-methyl-3-(3,4,5-trimethoxyphenyl)but-1-yn-1-yl]pyrimidine-2,4-diamine	7
DB00145	GLY	Glycine	6
DB08734	WRA	6,6-DIMETHYL-1-[3-(2,4,5-TRICHLOROPHENOXY)PROPOXY]-1,6-DIHYDRO-1,3,5-TRIAZINE-2,4-DIAMINE	6
DB00642	LYA	Pemetrexed	5
DB07140	53R	5-[(3R)-3-(5-methoxybiphenyl-3-yl)but-1-yn-1-yl]-6-methylpyrimidine-2,4-diamine	5

Most frequently bound compounds

PDB ligand	Name	Domains in contact
NDP	NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE	460
NAP	NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE	393
FOL	FOLIC ACID	154
MTX	METHOTREXATE	148
CL	CHLORIDE ION	139
CAmetal	CALCIUM ION	113
MNmetal	MANGANESE (II) ION	64
TOP	TRIMETHOPRIM	55
COmetal	COBALT (II) ION	48
BME	BETA-MERCAPTOETHANOL	24
CP6	5-(4-CHLORO-PHENYL)-6-ETHYL-PYRIMIDINE-2,4-DIAMINE	24
DHF	DIHYDROFOLIC ACID	20
MMV	3-(2-{3-[(2,4-diamino-6-ethylpyrimidin-5-yl)oxy]propoxy}phenyl)propanoic acid	19
1CY	1-(4-chlorophenyl)-6,6-dimethyl-1,6-dihydro-1,3,5-triazine-2,4-diamine	17
MGmetal	MAGNESIUM ION	16
06U	6-ethyl-5-{(3R)-3-[3-methoxy-5-(pyridin-4-yl)phenyl]but-1-yn-1-yl}pyrimidine-2,4-diamine	14
TMQ	TRIMETREXATE	14
LG3	PYRIMIDINE-2,4-DIAMINE	11
RAR	5-(3,4-dimethoxy-5-{(1E)-3-oxo-3-[(1S)-1-propylphthalazin-2(1H)-yl]prop-1-en-1-yl}benzyl)pyrimidine-2,4-diamine	11
NAmetal	SODIUM ION	10