X-group (possible homology)

1084 Photosystem II reaction center W protein, chloroplastic

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Ligands and drugs

113

Member domains

with ligand contacts (≤ 4 Å)

57.5% of members

with DrugDomain annotations

18.6% of members

with a DrugBank compound

18.6% 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	0.25×observed / expected4×	Ratio	Significance
Lipids and lipid-like molecules	8	0.9		9.11×	not tested
Organoheterocyclic compounds	8	1.2		6.59×	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
DB02133	CLA	Chlorophyll A	21
DB03426	DGD	Digalactosyl Diacyl Glycerol (Dgdg)	4
DB03279	LMU	Dodecyl-Alpha-D-Maltoside	3
DB02043	LHG	1,2-Dipalmitoyl-Phosphatidyl-Glycerole	2
DB06755	BCR	Beta carotene	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
LMG	1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE	63
CLA	CHLOROPHYLL A	62
LHG	1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE	24
DGA	DIACYL GLYCEROL	13
A86	(3S,3'S,5R,5'R,6S,6'R,8'R)-3,5'-dihydroxy-8-oxo-6',7'-didehydro-5,5',6,6',7,8-hexahydro-5,6-epoxy-beta,beta-caroten-3'-yl acetate	7
BCR	BETA-CAROTENE	7
4RF	Tripalmitoylglycerol	6
DGD	DIGALACTOSYL DIACYL GLYCEROL (DGDG)	6
ERG	ERGOSTEROL	6
3PH	1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE	2
AJP	Digitonin	2
LNL	ALPHA-LINOLENIC ACID	2
LMU	DODECYL-ALPHA-D-MALTOSIDE	1