X-group (possible homology)

5074 Bacterial light-harvesting complex subunits

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Ligands and drugs

3,156

Member domains

2,936

with ligand contacts (≤ 4 Å)

93.0% of members

1,668

with DrugDomain annotations

52.9% of members

1,575

with a DrugBank compound

49.9% 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)

5.0

Superclasses per 20 proteins

narrower than 84% 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
Lipids and lipid-like molecules	51	5.6	9.11×	q < 0.0001
Organoheterocyclic compounds	46	7.7	5.94×	q < 0.0001
Homogeneous metal compounds	9	24.7	0.36×	q < 0.0001
Homogeneous non-metal compounds	0	10.8	0	q < 0.0001
Nucleosides, nucleotides, and analogues	0	13.9	0	q < 0.0001
Organic acids and derivatives	0	7.8	0	q = 8.7e-4
Organic oxygen compounds	0	10.0	0	q < 0.0001
Hydrocarbons	3	0.4	8.54×	not tested
Organic nitrogen compounds	3	1.6	1.87×	not tested
Benzenoids	1	3.7	0.27×	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
DB01853	BCL	Bacteriochlorophyll A	1,560
DB11231	LYC	Lycopene	138
DB03429	CDL	Tetrastearoyl cardiolipin	101
DB09270	U10	Ubidecarenone	45
DB01728	PEF	1,2-dihexadecanoyl-sn-glycero-3-phosphoethanolamine	36
DB07646	DET	UNDECYLAMINE-N,N-DIMETHYL-N-OXIDE	10
DB04079	HTO	Heptane-1,2,3-Triol	8
DB03317	HEC	Ferroheme C	3
DB04327	PEE	Phosphatidylethanolamine	3
DB08231	MYR	Myristic acid	2

Most frequently bound compounds

PDB ligand	Name	Domains in contact
BCL	BACTERIOCHLOROPHYLL A	2,725
CRT	SPIRILLOXANTHIN	811
SPO	SPHEROIDENE	515
V7N	(2~{E},4~{E},6~{E},10~{E},12~{E},14~{E},16~{E},18~{E},20~{E},22~{Z},24~{E},26~{E},28~{E})-23-methanoyl-31-methoxy-2,6,10,14,19,27,31-heptamethyl-dotriaconta-2,4,6,10,12,14,16,18,20,22,24,26,28-tridecaenoic acid	480
CAmetal	CALCIUM ION	323
PGV	(1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE	291
CDL	CARDIOLIPIN	149
LYC	LYCOPENE	144
KGD	beta,psi-caroten-4-one	132
0V9	(19R,22S)-25-amino-22-hydroxy-22-oxido-16-oxo-17,21,23-trioxa-22lambda~5~-phosphapentacosan-19-yl (9Z)-hexadec-9-enoate	130
07D	Trans-Geranyl BACTERIOCHLOROPHYLL A	126
A1EFU	(4~{E},16~{E},26~{E})-2-methoxy-2,6,10,14,19,23,27,31-octamethyl-dotriaconta-4,6,8,10,12,14,16,18,20,22,26,30-dodecaen-3-one	102
PEX	1,2-DIDECANOYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE	77
PC1	1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE	72
IRM	1,2-Dihydro-psi,psi-caroten-1-ol	63
U4Z	gamma-Carotene	63
SP2	3,4-DIHYDROSPHEROIDENE	54
U10	UBIQUINONE-10	52
UNL	Unknown ligand	52
BCB	BACTERIOCHLOROPHYLL B	51