X-group (possible homology)

106 Globin-like

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Ligands and drugs

13,183

Member domains

11,213

with ligand contacts (≤ 4 Å)

85.1% of members

9,124

with DrugDomain annotations

69.2% of members

3,487

with a DrugBank compound

26.5% 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.

283

Proteins with classified ligands

Superclasses bound (of 23)

6.6

Superclasses per 20 proteins

narrower than 67% 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
Organoheterocyclic compounds	134	42.9	3.12×	q < 0.0001
Homogeneous non-metal compounds	157	60.1	2.61×	q < 0.0001
Organic nitrogen compounds	6	8.9	0.67×	q = 0.47
Benzenoids	13	20.4	0.64×	q = 0.15
Organosulfur compounds	3	5.7	0.52×	q = 0.47
Mixed metal/non-metal compounds	2	5.9	0.34×	q = 0.19
Lipids and lipid-like molecules	9	31.1	0.29×	q < 0.0001
Organic oxygen compounds	15	55.6	0.27×	q < 0.0001
Organic acids and derivatives	10	43.2	0.23×	q < 0.0001
Homogeneous metal compounds	25	137.0	0.18×	q < 0.0001
Phenylpropanoids and polyketides	1	5.8	0.17×	q = 0.06
Nucleosides, nucleotides, and analogues	4	77.1	0.05×	q < 0.0001
Organometallic compounds	4	0.4	10×	not tested
Organohalogen compounds	1	0.8	1.26×	not tested
Hydrocarbons	1	2.0	0.51×	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	3,205
DB11588	CMO	Carbon monoxide	655
DB09140	OXY	Oxygen	415
DB12529	NO2	Nitrite	32
DB11558	MBN	Toluene	16
DB03147	FAD	Flavin adenine dinucleotide	14
DB01826	NBN	N-Butyl Isocyanide	12
DB14522	OH	Hydroxide ion	12
DB04349	PGO	(S)-propane-1,2-diol	10
DB08077	L35	2-[4-({[(3,5-DICHLOROPHENYL)AMINO]CARBONYL}AMINO)PHENOXY]-2-METHYLPROPANOIC ACID	10
DB00145	GLY	Glycine	9
DB01393	PEM	Bezafibrate	9
DB08486	RQ3	Efaproxiral	8
DB00123	LYS	Lysine	7
DB00141	NAG	N-Acetylglucosamine	7
DB02110	COH	Protoporphyrin Ix Containing Co	7
DB03399	ENC	Ethyl Isocyanide	7
DB04417	NPO	P-Nitrophenol	7
DB02182	HEB	Hybrid Between B and C Type Hemes (Protoporphyrin Ixcontaining Fe)	6
DB02646	NOE	Nitrosoethane	6

Most frequently bound compounds

PDB ligand	Name	Domains in contact
PEB	PHYCOERYTHROBILIN	4,629
HEM	PROTOPORPHYRIN IX CONTAINING FE	3,449
CYC	PHYCOCYANOBILIN	3,336
PUB	PHYCOUROBILIN	1,022
CMO	CARBON MONOXIDE	715
OXY	OXYGEN MOLECULE	451
CYN	CYANIDE ION	213
NAmetal	SODIUM ION	95
HNI	PROTOPORPHYRIN IX CONTAINING NI(II)	90
CL	CHLORIDE ION	80
2FU	BUT-2-ENEDIAL	46
NO	NITRIC OXIDE	37
XE	XENON	37
DBV	15,16-DIHYDROBILIVERDIN	36
NO2	NITRITE ION	32
AX9	DiCys-(15,16)-Dihydrobiliverdin	24
PI	HYDROGENPHOSPHATE ION	24
O	OXYGEN ATOM	23
BLA	BILIVERDINE IX ALPHA	22
CAmetal	CALCIUM ION	21