X-group (possible homology)

824 Heme-binding protein A (HasA)

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Ligands and drugs

117

Member domains

112

with ligand contacts (≤ 4 Å)

95.7% of members

107

with DrugDomain annotations

91.5% of members

with a DrugBank compound

69.2% 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)

—

Superclasses per 20 proteins

fewer than 20 proteins: too few to compare at equal depth

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 nitrogen compounds	2	0.1	16×	not tested
Benzenoids	1	0.3	3.47×	not tested
Organoheterocyclic compounds	1	0.6	1.65×	not tested
Homogeneous metal compounds	3	1.9	1.55×	not tested
Organic oxygen compounds	1	0.8	1.27×	not tested
Homogeneous non-metal compounds	1	0.9	1.18×	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	47
DB02219	CXS	3-(cyclohexylamino)propanesulfonic acid	11
DB03309	NHE	N-cyclohexyltaurine	8
DB04237	TAM	Tris(Hydroxyethyl)Aminomethane	1
DB04811	YOM	Salophen iron chelate	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
HEM	PROTOPORPHYRIN IX CONTAINING FE	50
CXS	3-CYCLOHEXYL-1-PROPYLSULFONIC ACID	12
CL	CHLORIDE ION	10
MQP	[5,10,15,20-tetraphenylporphyrinato(2-)-kappa~4~N~21~,N~22~,N~23~,N~24~]iron	10
NHE	2-[N-CYCLOHEXYLAMINO]ETHANE SULFONIC ACID	10
BWU	Tetraphenylporphycene contating cobalt	8
WXP	5,10,15-Triphenylporphyrin cpntaining FE	5
7OH	Fe-Tetra(4-pyridyl)porphyrin	4
J7X	Mn-5,10,15,20-Tetraphenylporphyrin	4
NAmetal	SODIUM ION	4
ZNmetal	ZINC ION	4
6KI	Co-octaethylporphyrin	3
J7U	chromium-5,10,15,20-tetraphenylporphyrin	3
J83	Co-5,10,15,20-Tetraphenylporphyrin	3
7KI	Co-5-octaethyloxaporphyrinium cation	2
83L	10,20-Diphenyl-5,15-diaza-porphyrin containing FE	2
MH0	Mesoheme	2
P6G	HEXAETHYLENE GLYCOL	2
VPC	Phthalocyanine containing GA	2
WPC	[29H,31H-phthalocyaninato(2-)-kappa~4~N~29~,N~30~,N~31~,N~32~]iron	2