X-group (possible homology)

282 CBS-domain

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Ligands and drugs

2,872

Member domains

666

with ligand contacts (≤ 4 Å)

23.2% of members

430

with DrugDomain annotations

15.0% of members

366

with a DrugBank compound

12.7% 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)

5.3

Superclasses per 20 proteins

narrower than 79% 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
Nucleosides, nucleotides, and analogues	54	17.7	3.05×	q < 0.0001
Homogeneous metal compounds	25	31.5	0.80×	q = 0.19
Homogeneous non-metal compounds	10	13.8	0.72×	q = 0.36
Lipids and lipid-like molecules	3	7.1	0.42×	q = 0.16
Organoheterocyclic compounds	3	9.9	0.30×	q = 0.03
Organic acids and derivatives	1	9.9	0.10×	q = 1.1e-3
Organic oxygen compounds	1	12.8	0.08×	q < 0.0001
Organic nitrogen compounds	1	2.0	0.49×	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
DB00171	ATP	ATP	149
DB00131	AMP	Adenosine phosphate	130
DB16833	ADP	Adenosine disphosphate	54
DB04137	GTP	Guanosine-5'-Triphosphate	47
DB04022	G4P	Guanosine tetraphosphate	16
DB00118	SAM	Ademetionine	12
DB04315	GDP	Guanosine-5'-Diphosphate	11
DB00157	NAI	NADH	8
DB14128	NAD	Nadide	6
DB01700	AMZ	AICA ribonucleotide	5
DB02282	MTA	5'-S-methyl-5'-thioadenosine	4
DB04237	TAM	Tris(Hydroxyethyl)Aminomethane	4
DB04482	CMK	Cmp-2-Keto-3-Deoxy-Octulosonic Acid	4
DB01972	5GP	Guanosine-5'-Monophosphate	3
DB00640	ADN	Adenosine	2
DB00688	—	—	2
DB00811	—	Ribavirin	2
DB00133	—	Serine	1
DB00151	—	Cysteine	1
DB01694	TAR	D-tartaric acid	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
ATP	ADENOSINE-5'-TRIPHOSPHATE	291
AMP	ADENOSINE MONOPHOSPHATE	137
GTP	GUANOSINE-5'-TRIPHOSPHATE	119
MGmetal	MAGNESIUM ION	103
ADP	ADENOSINE-5'-DIPHOSPHATE	55
CL	CHLORIDE ION	33
G4P	GUANOSINE-5',3'-TETRAPHOSPHATE	32
5GP	GUANOSINE-5'-MONOPHOSPHATE	27
SAM	S-ADENOSYLMETHIONINE	22
GDP	GUANOSINE-5'-DIPHOSPHATE	17
IMP	INOSINIC ACID	16
2BA	(2R,3R,3aS,5R,7aR,9R,10R,10aS,12R,14aR)-2,9-bis(6-amino-9H-purin-9-yl)octahydro-2H,7H-difuro[3,2-d:3',2'-j][1,3,7,9,2,8]tetraoxadiphosphacyclododecine-3,5,10,12-tetrol 5,12-dioxide	13
ANP	PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER	6
C2Z	5-(5-hydroxyl-isoxazol-3-yl)-furan-2-phosphonic acid	6
NAD	NICOTINAMIDE-ADENINE-DINUCLEOTIDE	6
NAI	1,4-DIHYDRONICOTINAMIDE ADENINE DINUCLEOTIDE	6
AMZ	AMINOIMIDAZOLE 4-CARBOXAMIDE RIBONUCLEOTIDE	5
0J1	(2R)-3-{[(R)-hydroxy{[(1S,2R,3S,4S,5R,6R)-2,3,4,6-tetrahydroxy-5-(phosphonooxy)cyclohexyl]oxy}phosphoryl]oxy}propane-1,2-diyl dinonanoate	4
B4P	BIS(ADENOSINE)-5'-TETRAPHOSPHATE	4
BR	BROMIDE ION	4