X-group (possible homology)

5064 Photosystem I reaction center subunit XI, PsaL

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Ligands and drugs

258

Member domains

215

with ligand contacts (≤ 4 Å)

83.3% of members

157

with DrugDomain annotations

60.9% of members

153

with a DrugBank compound

59.3% 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)

3.0

Superclasses per 20 proteins

narrower than 95% 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
Organoheterocyclic compounds	33	5.0	6.59×	q < 0.0001
Homogeneous metal compounds	8	16.0	0.50×	q = 0.01
Homogeneous non-metal compounds	0	7.0	0	q = 2.1e-3
Nucleosides, nucleotides, and analogues	0	9.0	0	q = 1.3e-4
Organic acids and derivatives	0	5.0	0	q = 0.01
Organic oxygen compounds	0	6.5	0	q = 3.3e-3
Lipids and lipid-like molecules	31	3.6	8.56×	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	153
DB06755	BCR	Beta carotene	146
DB02043	LHG	1,2-Dipalmitoyl-Phosphatidyl-Glycerole	38
DB03279	LMU	Dodecyl-Alpha-D-Maltoside	8
DB03426	DGD	Digalactosyl Diacyl Glycerol (Dgdg)	4

Most frequently bound compounds

PDB ligand	Name	Domains in contact
CLA	CHLOROPHYLL A	210
BCR	BETA-CAROTENE	197
CAmetal	CALCIUM ION	72
LMG	1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE	65
LHG	1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE	60
SQD	1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL	21
F6C	Chlorophyll F	16
UNL	Unknown ligand	14
DGD	DIGALACTOSYL DIACYL GLYCEROL (DGDG)	9
II0	(1~{R})-3,5,5-trimethyl-4-[(3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E})-3,7,12,16-tetramethyl-18-[(4~{R})-2,6,6-trimethyl-4-oxidanyl-cyclohexen-1-yl]octadeca-3,5,7,9,11,13,15-heptaen-1,17-diynyl]cyclohex-3-en-1-ol	9
LMU	DODECYL-ALPHA-D-MALTOSIDE	9
EQ3	(3'R)-3'-hydroxy-beta,beta-caroten-4-one	8
8CT	(6'R,11cis,11'cis,13cis,15cis)-4',5'-didehydro-5',6'-dihydro-beta,beta-carotene	7
DD6	(3S,3'R,5R,6S,7cis)-7',8'-didehydro-5,6-dihydro-5,6-epoxy-beta,beta-carotene-3,3'-diol	6
WVN	1,3,3-trimethyl-2-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-3,7,12,16-tetramethyl-18-[(1R)-2,6,6-trimethylcyclohex-2-en-1-yl]octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohexene	6
AJP	Digitonin	4
CL7	CHLOROPHYLL D	4
ECH	beta,beta-caroten-4-one	4
LFA	EICOSANE	4
ZEX	(1R,2S)-4-{(1E,3E,5E,7E,9E,11E,13E,15E,17E)-18-[(4S)-4-hydroxy-2,6,6-trimethylcyclohex-1-en-1-yl]-3,7,12,16-tetramethyloctadeca-1,3,5,7,9,11,13,15,17-nonaen-1-yl}-2,5,5-trimethylcyclohex-3-en-1-ol	4