X-group (possible homology)

5031 Photosystem II reaction center protein J, PsbJ

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Ligands and drugs

443

Member domains

296

with ligand contacts (≤ 4 Å)

66.8% of members

216

with DrugDomain annotations

48.8% of members

216

with a DrugBank compound

48.8% 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)

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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	2	6.3	0.32×	q = 0.04
Hydrocarbons	1	0.1	11×	not tested
Lipids and lipid-like molecules	13	1.4	9.11×	not tested
Organic oxygen compounds	2	2.6	0.78×	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
DB06755	BCR	Beta carotene	215
DB03426	DGD	Digalactosyl Diacyl Glycerol (Dgdg)	197
DB03193	STE	Stearic acid	50
DB02043	LHG	1,2-Dipalmitoyl-Phosphatidyl-Glycerole	33
DB18267	HEM	Ferroheme	10
DB04450	HTG	Heptyl 1-Thiohexopyranoside	1
DB04735	MGE	Monogalactosyldiacylglycerol	1

Most frequently bound compounds

PDB ligand	Name	Domains in contact
DGD	DIGALACTOSYL DIACYL GLYCEROL (DGDG)	294
BCR	BETA-CAROTENE	290
LMG	1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE	285
SQD	1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL	115
UNL	Unknown ligand	106
MGmetal	MAGNESIUM ION	95
STE	STEARIC ACID	52
LHG	1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE	21
PL9	2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE	16
DGA	DIACYL GLYCEROL	10
4RF	Tripalmitoylglycerol	8
8CT	(6'R,11cis,11'cis,13cis,15cis)-4',5'-didehydro-5',6'-dihydro-beta,beta-carotene	6
MGE	(1S)-2-(ALPHA-L-ALLOPYRANOSYLOXY)-1-[(TRIDECANOYLOXY)METHYL]ETHYL PALMITATE	6
LFA	EICOSANE	4
3PH	1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE	2
PLM	PALMITIC ACID	2
HTG	heptyl 1-thio-beta-D-glucopyranoside	1
P6G	HEXAETHYLENE GLYCOL	1