X-group (possible homology)

136 Heme-dependent peroxidases

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Ligands and drugs

2,794

Member domains

1,131

with ligand contacts (≤ 4 Å)

40.5% of members

1,140

with DrugDomain annotations

40.8% of members

1,056

with a DrugBank compound

37.8% 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)

10.8

Superclasses per 20 proteins

broader than 98% 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 oxygen compounds	28	11.0	2.55×	q < 0.0001
Homogeneous non-metal compounds	29	11.9	2.44×	q < 0.0001
Organoheterocyclic compounds	17	8.5	2.00×	q = 8.6e-3
Homogeneous metal compounds	40	27.1	1.48×	q = 1.7e-3
Lipids and lipid-like molecules	4	6.2	0.65×	q = 0.60
Organic acids and derivatives	4	8.5	0.47×	q = 0.14
Nucleosides, nucleotides, and analogues	1	15.3	0.07×	q < 0.0001
Lignans, neolignans and related compounds	1	0.0	24×	not tested
Organohalogen compounds	2	0.2	13×	not tested
Alkaloids and derivatives	1	0.2	5.30×	not tested
Organosulfur compounds	6	1.1	5.28×	not tested
Phenylpropanoids and polyketides	6	1.2	5.22×	not tested
Benzenoids	16	4.0	3.96×	not tested
Organic nitrogen compounds	2	1.8	1.14×	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	Ferroheme	860
DB00141	NAG	N-Acetylglucosamine	311
DB09140	OXY	Oxygen	106
DB02110	COH	Protoporphyrin Ix Containing Co	54
DB03317	HEC	Ferroheme C	48
DB00951	NIZ	Isoniazid	30
DB02579	AKR	Acrylic Acid	27
DB11091	PEO	Hydrogen peroxide	20
DB04557	ACD	Arachidonic Acid	15
DB16159	FLP	Esflurbiprofen	15
DB01283	LUR	Lumiracoxib	14
DB00126	ASC	Ascorbic acid	12
DB04473	FUC	alpha-L-fucose	12
DB03934	ZNH	Zinc protoporphyrin	11
DB01924	BHO	Benzhydroxamic Acid	10
DB00482	CEL	Celecoxib	9
DB09213	IBP	Dexibuprofen	9
DB00586	DIF	Diclofenac	8
DB00814	MXM	Meloxicam	8
DB02962	BZI	Benzimidazole	7

Most frequently bound compounds

PDB ligand	Name	Domains in contact
HEM	PROTOPORPHYRIN IX CONTAINING FE	859
CAmetal	CALCIUM ION	304
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	287
NAmetal	SODIUM ION	282
CL	CHLORIDE ION	147
OXY	OXYGEN MOLECULE	106
IOD	IODIDE ION	61
SCN	THIOCYANATE ION	55
COH	PROTOPORPHYRIN IX CONTAINING CO	49
Kmetal	POTASSIUM ION	48
MAN	alpha-D-mannopyranose	34
NIZ	pyridine-4-carbohydrazide	33
HEC	HEME C	28
AKR	ACRYLIC ACID	27
OSM	1-(OXIDOSULFANYL)METHANAMINE	22
ZNmetal	ZINC ION	22
BMA	beta-D-mannopyranose	21
PEO	HYDROGEN PEROXIDE	21
CYN	CYANIDE ION	17
FLP	FLURBIPROFEN	14