X-group (possible homology)

135 Transducin (alpha subunit), insertion domain

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Ligands and drugs

986

Member domains

221

with ligand contacts (≤ 4 Å)

22.4% of members

180

with DrugDomain annotations

18.3% of members

179

with a DrugBank compound

18.2% 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)

—

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	11	7.7	1.42×	q = 0.19
Mixed metal/non-metal compounds	8	0.3	24×	not tested
Nucleosides, nucleotides, and analogues	16	4.4	3.67×	not tested
Homogeneous non-metal compounds	4	3.4	1.18×	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
DB04315	GDP	Guanosine-5'-Diphosphate	125
DB04444	ALF	Tetrafluoroaluminate Ion	43
DB01864	GSP	5'-Guanosine-Diphosphate-Monothiophosphate	41
DB04137	GTP	Guanosine-5'-Triphosphate	10
DB02082	GNP	Phosphoaminophosphonic acid guanylate ester	3
DB02994	—	Cacodylic acid	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
GDP	GUANOSINE-5'-DIPHOSPHATE	138
MGmetal	MAGNESIUM ION	85
GSP	5'-GUANOSINE-DIPHOSPHATE-MONOTHIOPHOSPHATE	55
ALF	TETRAFLUOROALUMINATE ION	46
GTP	GUANOSINE-5'-TRIPHOSPHATE	13
CL	CHLORIDE ION	7
HF2	(2R)-2-hydroxy-3-phenylpropanoic acid	4
HL2	(2S,3R)-2-amino-3-hydroxy-4-methylpentanoic acid	4
T7M	(2R)-1-(heptadecanoyloxy)-3-{[(R)-hydroxy{[(1R,2R,3R,4R,5S,6R)-2,3,5,6-tetrahydroxy-4-(phosphonooxy)cyclohexyl]oxy}phosphoryl]oxy}propan-2-yl (5Z,8Z,11Z,14Z)-icosa-5,8,11,14-tetraenoate	4
CAmetal	CALCIUM ION	3
GNP	PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER	3
ALA	ALANINE	2
CSmetal	CESIUM ION	2
DAM	N-METHYL-ALPHA-BETA-DEHYDROALANINE	2
MAA	N-methyl-L-alanine	2
OTH	N,O-dimethyl-L-threonine	2
THC	N-METHYLCARBONYLTHREONINE	2
UDL	(2~{S},3~{R})-2-acetamido-4-methyl-3-oxidanyl-pentanoic acid	2
VSN	5'-O-[(R)-hydroxy(thiophosphonooxy)phosphoryl]guanosine	2
A1AEI	4-methyl-N-[(2M)-2-(1H-tetrazol-5-yl)phenyl]-6-(trifluoromethyl)pyrimidin-2-amine	1