X-group (possible homology)

321 Glutamine synthetase-like

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Ligands and drugs

3,225

Member domains

1,109

with ligand contacts (≤ 4 Å)

34.4% of members

815

with DrugDomain annotations

25.3% of members

573

with a DrugBank compound

17.8% 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)

6.7

Superclasses per 20 proteins

narrower than 65% 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 acids and derivatives	34	9.2	3.71×	q < 0.0001
Nucleosides, nucleotides, and analogues	42	16.4	2.57×	q < 0.0001
Homogeneous metal compounds	45	29.0	1.55×	q = 1.4e-4
Organoheterocyclic compounds	7	9.1	0.77×	q = 0.67
Homogeneous non-metal compounds	8	12.7	0.63×	q = 0.21
Organic oxygen compounds	2	11.8	0.17×	q = 1.3e-3
Lipids and lipid-like molecules	0	6.6	0	q = 3.5e-3
Mixed metal/non-metal compounds	2	1.2	1.61×	not tested
Organosulfur compounds	1	1.2	0.82×	not tested
Benzenoids	1	4.3	0.23×	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
DB16833	ADP	Adenosine disphosphate	264
DB00130	GLN	L-Glutamine	100
DB00131	AMP	Adenosine phosphate	61
DB02751	NMG	Glycocyamine	36
DB00142	GLU	Glutamic acid	31
DB00125	ARG	Arginine	20
DB00171	ATP	ATP	19
DB14128	NAD	Nadide	16
DB02663	PPQ	2-Amino-4-(Hydroxymethyl-Phosphinyl)Butanoic Acid	15
DB00151	CYS	Cysteine	8
DB01971	URO	trans-urocanic acid	5
DB00148	—	Creatine	4
DB02490	IOM	(Diaminomethyl-Methyl-Amino)-Acetic Acid	4
DB03909	ACP	Adenosine-5'-[Beta, Gamma-Methylene]Triphosphate	4
DB04027	DAR	D-arginine	4
DB13191	—	—	4
DB14103	MSL	Methionine sulfoximine	4
DB03345	BME	Mercaptoethanol	3
DB00128	ASP	Aspartic acid	2
DB04701	GSM	S-Methyl glutathione	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
MGmetal	MAGNESIUM ION	512
ADP	ADENOSINE-5'-DIPHOSPHATE	368
MNmetal	MANGANESE (II) ION	278
P3S	L-METHIONINE-S-SULFOXIMINE PHOSPHATE	110
CL	CHLORIDE ION	99
GLN	GLUTAMINE	98
ATP	ADENOSINE-5'-TRIPHOSPHATE	81
AMP	ADENOSINE MONOPHOSPHATE	63
AKG	2-OXOGLUTARIC ACID	48
NMG	GUANIDINO ACETATE	36
CRN	N-[(E)-AMINO(IMINO)METHYL]-N-METHYLGLYCINE	33
NAmetal	SODIUM ION	31
GLU	GLUTAMIC ACID	30
ZNmetal	ZINC ION	29
ANP	PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER	26
2K9	9-phenyl-4H-imidazo[1,2-a]indeno[1,2-e]pyrazin-4-one	24
NImetal	NICKEL (II) ION	24
P3P	(2S)-2-AMINO-4-[METHYL(PHOSPHONOOXY)PHOSPHORYL]BUTANOIC ACID	21
NAD	NICOTINAMIDE-ADENINE-DINUCLEOTIDE	20
1AZ	1-(3,4-dichlorobenzyl)-3,7-dimethyl-8-morpholin-4-yl-3,7-dihydro-1H-purine-2,6-dione	18