X-group (possible homology)

7556 Fe-only hydrogenase

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Ligands and drugs

218

Member domains

121

with ligand contacts (≤ 4 Å)

55.5% of members

with DrugDomain annotations

37.2% of members

with a DrugBank compound

11.0% 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
Miscellaneous inorganic compounds	1	0.0	272×	not tested
Organosulfur compounds	1	0.1	9.86×	not tested
Organic acids and derivatives	4	0.8	5.24×	not tested
Homogeneous non-metal compounds	3	1.1	2.83×	not tested
Homogeneous metal compounds	2	2.4	0.83×	not tested
Nucleosides, nucleotides, and analogues	1	1.4	0.73×	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
DB11588	CMO	Carbon monoxide	4
DB00151	CYS	Cysteine	2
DB00157	NAI	NADH	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
SF4	IRON/SULFUR CLUSTER	121
402	dicarbonyl[bis(cyanide-kappaC)]-mu-(iminodimethanethiolatato-1kappaS:2kappaS)-mu-(oxomethylidene)diiron(2+)	52
MGmetal	MAGNESIUM ION	49
CL	CHLORIDE ION	32
CMO	CARBON MONOXIDE	6
HC1	2 IRON/2 SULFUR/5 CARBONYL/2 WATER INORGANIC CLUSTER	6
VHR	Binuclear [FeFe], di(thiomethyl)amine, carbon monoxide, cyanide cluster (-CN form)	6
CYN	CYANIDE ION	5
MHX	Binuclear [FeFe], di(thiomethyl)amine, carbon monoxide, cyanide cluster (-CO form)	5
4WW	bis(cyanido-kappaC)(dicarbonyl)-mu-(oxomethylidene)[mu-propane-1,3-bis(thiolate)-1kappa~2~S~1~,S~3~:2kappa~2~S~1~,S~3~]diiron(2+)	4
FE2metal	FE (II) ION	4
LImetal	LITHIUM ION	4
NAmetal	SODIUM ION	4
PDT	1,3-PROPANEDITHIOL	4
KR	KRYPTON	3
4WV	bis(cyanido-kappaC)(dicarbonyl)-mu-(oxomethylidene)-mu-(oxydimethanethiolate-1kappaS:2kappaS)diiron(2+)	2
4WX	bis(cyanido-kappaC)(dicarbonyl)-mu-(oxomethylidene)-mu-(sulfanediyldimethanethiolatato-1kappaS:2kappaS)diiron(2+)	2
9SQ	dicarbonyl[bis(cyanide-kappaC)]-mu-(iminodimethaneselenato- 1kappaS:2kappaS)-mu-(oxomethylidene)diiron(2+)	2
ARS	ARSENIC	2
CYS	CYSTEINE	2