X-group (possible homology)

150 Ferritin/Heme oxygenase/4-helical cytokines

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Ligands and drugs

12,351

Member domains

6,019

with ligand contacts (≤ 4 Å)

48.7% of members

5,912

with DrugDomain annotations

47.9% of members

2,829

with a DrugBank compound

22.9% 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.

263

Proteins with classified ligands

Superclasses bound (of 23)

8.0

Superclasses per 20 proteins

broader than 55% 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	211	127.3	1.66×	q < 0.0001
Homogeneous non-metal compounds	81	55.8	1.45×	q = 7.4e-4
Mixed metal/non-metal compounds	5	5.5	0.92×	q = 1.00
Benzenoids	17	19.0	0.90×	q = 0.79
Organic oxygen compounds	41	51.6	0.79×	q = 0.15
Lipids and lipid-like molecules	20	28.9	0.69×	q = 0.14
Organoheterocyclic compounds	21	39.9	0.53×	q = 1.8e-3
Organic acids and derivatives	16	40.1	0.40×	q < 0.0001
Organosulfur compounds	2	5.3	0.38×	q = 0.25
Phenylpropanoids and polyketides	2	5.4	0.37×	q = 0.25
Organic nitrogen compounds	2	8.3	0.24×	q = 0.03
Nucleosides, nucleotides, and analogues	14	71.7	0.20×	q < 0.0001
Miscellaneous inorganic compounds	1	0.2	5.17×	not tested
Organohalogen compounds	3	0.7	4.06×	not tested
Organometallic compounds	1	0.4	2.71×	not tested
Hydrocarbons	1	1.8	0.55×	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
DB18267	HEM	PROTOPORPHYRIN IX CONTAINING FE	1,014
DB14522	OH	HYDROXIDE ION	73
DB00141	NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	38
DB09140	OXY	OXYGEN MOLECULE	37
DB03796	PLM	PALMITIC ACID	35
DB03085	GOA	GLYCOLIC ACID	31
DB03934	ZNH	PROTOPORPHYRIN IX CONTAINING ZN	31
DB03247	FMN	FLAVIN MONONUCLEOTIDE	29
DB00171	ATP	ADENOSINE-5'-TRIPHOSPHATE	28
DB11091	PEO	HYDROGEN PEROXIDE	24
DB03793	BEZ	BENZOIC ACID	17
DB02022	HMH	4-AMINO-5-HYDROXYMETHYL-2-METHYLPYRIMIDINE	14
DB02210	HEZ	HEXANE-1,6-DIOL	10
DB08231	MYR	MYRISTIC ACID	9
DB09459	TLA	L(+)-TARTARIC ACID	9
DB11588	CMO	CARBON MONOXIDE	9
DB03205	PQQ	PYRROLOQUINOLINE QUINONE	8
DB09494	PL3	HEXADECAN-1-OL	8
DB03017	DAO	LAURIC ACID	7
DB03896	3PO	TRIPHOSPHATE	7

Most frequently bound compounds

PDB ligand	Name	Domains in contact
FEmetal	FE (III) ION	2,080
HEM	PROTOPORPHYRIN IX CONTAINING FE	1,018
NAmetal	SODIUM ION	807
FE2metal	FE (II) ION	790
CAmetal	CALCIUM ION	618
MGmetal	MAGNESIUM ION	607
ZNmetal	ZINC ION	601
CL	CHLORIDE ION	429
Kmetal	POTASSIUM ION	396
MNmetal	MANGANESE (II) ION	216
CDmetal	CADMIUM ION	177
NImetal	NICKEL (II) ION	100
V9D	N~1~,N~3~-dihydroxybenzene-1,3-dicarboxamide	96
OH	HYDROXIDE ION	73
LFA	EICOSANE	64
HGmetal	MERCURY (II) ION	63
CUmetal	COPPER (II) ION	54
MN3metal	MANGANESE (III) ION	54
V9Y	N~2~,N~5~-dihydroxyfuran-2,5-dicarboxamide	51
FEC	1,3,5,8-TETRAMETHYL-PORPHINE-2,4,6,7-TETRAPROPIONIC ACID FERROUS COMPLEX	48