X-group (possible homology)

274 Pili subunits

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Ligands and drugs

973

Member domains

200

with ligand contacts (≤ 4 Å)

20.6% of members

142

with DrugDomain annotations

14.6% of members

with a DrugBank compound

9.7% 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	6.8	1.48×	q = 0.16
Organic nitrogen compounds	1	0.4	2.27×	not tested
Homogeneous non-metal compounds	6	3.0	2.02×	not tested
Organic acids and derivatives	2	2.1	0.94×	not tested
Lipids and lipid-like molecules	1	1.5	0.65×	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
DB01738	OPE	Phosphorylcolamine	40
DB03309	NHE	N-cyclohexyltaurine	2
DB00123	LYS	Lysine	1
DB00142	GLU	Glutamic acid	1
DB04079	HTO	Heptane-1,2,3-Triol	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CAmetal	CALCIUM ION	51
A2G	2-acetamido-2-deoxy-alpha-D-galactopyranose	45
OPE	PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER	40
CL	CHLORIDE ION	21
ZNmetal	ZINC ION	19
PTmetal	PLATINUM (II) ION	14
NAmetal	SODIUM ION	12
G3P	SN-GLYCEROL-3-PHOSPHATE	6
WKE	(2~{R})-~{N}-[(2~{R},3~{S},4~{S},5~{R},6~{R})-5-acetamido-2-methyl-4,6-bis(oxidanyl)oxan-3-yl]-2,3-bis(oxidanyl)propanamide	4
HTO	HEPTANE-1,2,3-TRIOL	3
NImetal	NICKEL (II) ION	3
B6D	2,4-bisacetamido-2,4,6-trideoxy-beta-D-glucopyranose	2
NHE	2-[N-CYCLOHEXYLAMINO]ETHANE SULFONIC ACID	2
TMO	trimethylamine oxide	2
CAD	CACODYLIC ACID	1
GLU	GLUTAMIC ACID	1
LYS	LYSINE	1