X-group (possible homology)

5092 Domain in virus attachment proteins

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Ligands and drugs

713

Member domains

272

with ligand contacts (≤ 4 Å)

38.1% of members

258

with DrugDomain annotations

36.2% of members

194

with a DrugBank compound

27.2% 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)

6.6

Superclasses per 20 proteins

narrower than 66% 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
Homogeneous non-metal compounds	5	5.1	0.98×	q = 1.00
Homogeneous metal compounds	9	11.6	0.78×	q = 0.39
Nucleosides, nucleotides, and analogues	0	6.5	0	q = 2.0e-3
Organic nitrogen compounds	2	0.8	2.65×	not tested
Organic oxygen compounds	10	4.7	2.12×	not tested
Organosulfur compounds	1	0.5	2.05×	not tested
Organic acids and derivatives	4	3.7	1.09×	not tested
Organoheterocyclic compounds	1	3.6	0.28×	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
DB03721	SIA	N-acetyl-alpha-neuraminic acid	33
DB04265	SLB	N-acetyl-beta-neuraminic acid	32
DB08357	P4G	Diethylene glycol diethyl ether	11
DB00130	GLN	L-Glutamine	6
DB00142	GLU	Glutamic acid	4
DB00160	ALA	Alanine	3
DB01822	DTD	(4R,5R)-1,2-dithiane-4,5-diol	2
DB04237	TAM	Tris(Hydroxyethyl)Aminomethane	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
ZNmetal	ZINC ION	52
SIA	N-acetyl-alpha-neuraminic acid	31
SLB	N-acetyl-beta-neuraminic acid	31
BR	BROMIDE ION	15
MGmetal	MAGNESIUM ION	15
CL	CHLORIDE ION	12
P4G	1-ETHOXY-2-(2-ETHOXYETHOXY)ETHANE	11
18D	3,5-dideoxy-5-(propanoylamino)-D-glycero-alpha-D-galacto-non-2-ulopyranosonic acid	9
NAmetal	SODIUM ION	9
ANA	methyl 4-O-acetyl-5-acetamido-3,5-dideoxy-D-glycero-alpha-D-galacto-non-2-ulopyranosidonic acid	6
GLN	GLUTAMINE	6
CAmetal	CALCIUM ION	5
423	(1-{2-[bis(2-{4-[({(6R)-5-(acetylamino)-3,5-dideoxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]-beta-L-threo-hex-2-ulopyranonosyl}oxy)methyl]-1H-1,2,3-triazol-1-yl}ethyl)amino]ethyl}-1H-1,2,3-triazol-4-yl)methyl (6R)-5-(acetylamino)-3,5-dideoxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]-beta-L-threo-hex-2-ulopyranosidonic acid	3
425	2-(1-{2-[bis(2-{4-[2-({(6R)-5-(acetylamino)-3,5-dideoxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]-beta-L-threo-hex-2-ulopyranonosyl}oxy)ethyl]-1H-1,2,3-triazol-1-yl}ethyl)amino]ethyl}-1H-1,2,3-triazol-4-yl)ethyl (6R)-5-(acetylamino)-3,5-dideoxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]-beta-L-threo-hex-2-ulopyranosidonic acid	3
42D	3,5-dideoxy-5-[(methoxycarbonyl)amino]-D-glycero-alpha-D-galacto-non-2-ulopyranosonic acid	3
GLU	GLUTAMIC ACID	3
MNA	2-O-methyl-5-N-acetyl-alpha-D-neuraminic acid	3
PKM	4-O-acetyl-5-acetamido-3,5-dideoxy-D-glycero-alpha-D-galacto-non-2-ulopyranosonic acid	3
SIO	methyl 4,9-di-O-acetyl-5-acetamido-3,5-dideoxy-D-glycero-alpha-D-galacto-non-2-ulopyranosidonic acid	3
DTD	DITHIANE DIOL	2