X-group (possible homology)

79 Phage tail fiber protein trimerization domain

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Ligands and drugs

798

Member domains

205

with ligand contacts (≤ 4 Å)

25.7% of members

184

with DrugDomain annotations

23.1% of members

108

with a DrugBank compound

13.5% 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.

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
Homogeneous metal compounds	10	8.2	1.22×	q = 0.55
Organic nitrogen compounds	3	0.5	5.61×	not tested
Homogeneous non-metal compounds	7	3.6	1.94×	not tested
Organic oxygen compounds	2	3.3	0.60×	not tested
Lipids and lipid-like molecules	1	1.9	0.54×	not tested
Organoheterocyclic compounds	1	2.6	0.39×	not tested
Organic acids and derivatives	1	2.6	0.39×	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
DB03193	STE	Stearic acid	39
DB04224	ELA	Oleic Acid	39
DB03796	PLM	Palmitic Acid	36
DB04237	TAM	Tris(Hydroxyethyl)Aminomethane	8
DB04265	SLB	N-acetyl-beta-neuraminic acid	8
DB02175	MLA	Malonic acid	6
DB00126	ASC	Ascorbic acid	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
ELA	Elaidic acid	45
STE	STEARIC ACID	45
PLM	PALMITIC ACID	42
CL	CHLORIDE ION	31
CAmetal	CALCIUM ION	29
MGmetal	MAGNESIUM ION	28
FEmetal	FE (III) ION	17
NAmetal	SODIUM ION	15
PTY	PHOSPHATIDYLETHANOLAMINE	12
MLA	MALONIC ACID	9
NImetal	NICKEL (II) ION	9
TAM	TRIS(HYDROXYETHYL)AMINOMETHANE	9
SLB	N-acetyl-beta-neuraminic acid	8
FE2metal	FE (II) ION	6
Kmetal	POTASSIUM ION	4
TMO	trimethylamine oxide	3
ASC	ASCORBIC ACID	1
BR	BROMIDE ION	1