X-group (possible homology)

6173 V1/V2 domain in HIV gp120

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Ligands and drugs

922

Member domains

690

with ligand contacts (≤ 4 Å)

74.8% of members

480

with DrugDomain annotations

52.1% of members

480

with a DrugBank compound

52.1% 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)

2.5

Superclasses per 20 proteins

narrower than 97% of the 256 X-groups with enough proteins to compare (median 7.6)

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 oxygen compounds	37	7.3	5.09×	q < 0.0001
Organoheterocyclic compounds	5	5.6	0.89×	q = 1.00
Homogeneous metal compounds	1	17.9	0.06×	q < 0.0001
Homogeneous non-metal compounds	0	7.9	0	q = 9.3e-4
Nucleosides, nucleotides, and analogues	0	10.1	0	q < 0.0001
Organic acids and derivatives	0	5.6	0	q = 9.2e-3

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
DB00141	NAG	N-Acetylglucosamine	478
DB14675	83J	Temsavir	7
DB04473	FUC	alpha-L-fucose	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	686
83J	1-[4-(benzenecarbonyl)piperazin-1-yl]-2-[4-methoxy-7-(3-methyl-1H-1,2,4-triazol-1-yl)-1H-pyrrolo[2,3-c]pyridin-3-yl]ethane-1,2-dione	6
ZNmetal	ZINC ION	2
FUC	alpha-L-fucopyranose	1
JYV	(2R)-{1-[{7-[2-({[3-(dimethylamino)propyl](methyl)amino}methyl)-1,3-thiazol-4-yl]-4-methoxy-1H-pyrrolo[2,3-c]pyridin-3-yl}(oxo)acetyl]piperidin-4-yl}(phenyl)acetonitrile	1
JYY	4-{3-[{4-[(R)-cyano(phenyl)methyl]piperidin-1-yl}(oxo)acetyl]-4-methoxy-1H-pyrrolo[2,3-c]pyridin-7-yl}-N-(2-hydroxyethyl)-1,3-thiazole-2-carboxamide	1
NAmetal	SODIUM ION	1