X-group (possible homology)

4106 Zinc hairpin stack

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Ligands and drugs

538

Member domains

with ligand contacts (≤ 4 Å)

2.6% of members

with DrugDomain annotations

2.4% of members

with a DrugBank compound

1.9% 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.

Proteins with classified ligands

Superclasses bound (of 23)

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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
Lipids and lipid-like molecules	2	0.4	4.55×	not tested
Homogeneous metal compounds	4	1.9	2.07×	not tested
Nucleosides, nucleotides, and analogues	1	1.1	0.92×	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
DB03796	PLM	Palmitic Acid	3
DB01842	PAP	3'-Phosphate-Adenosine-5'-Diphosphate	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
ZNmetal	ZINC ION	14
PLM	PALMITIC ACID	3
NAmetal	SODIUM ION	2
OLB	(2S)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate	2
PAP	3'-PHOSPHATE-ADENOSINE-5'-DIPHOSPHATE	2
PKZ	Palmitoyl-CoA	2