5019 Subunit III of photosystem I reaction centre, PsaF
Ligands and drugs
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.
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 |
|---|---|---|---|---|---|
| Organic oxygen compounds | 3 | 5.7 | 0.53× | q = 0.32 | |
| Homogeneous metal compounds | 0 | 14.0 | 0 | q < 0.0001 | |
| Homogeneous non-metal compounds | 0 | 6.2 | 0 | q = 4.7e-3 | |
| Nucleosides, nucleotides, and analogues | 0 | 7.9 | 0 | q = 5.5e-4 | |
| Lipids and lipid-like molecules | 26 | 3.2 | 8.17× | not tested | |
| Organoheterocyclic compounds | 27 | 4.4 | 6.14× | not tested | |
| Organic acids and derivatives | 1 | 4.4 | 0.23× | not tested |
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 | 145 |
| DB06755 | BCR | Beta carotene | 128 |
| DB02043 | LHG | 1,2-Dipalmitoyl-Phosphatidyl-Glycerole | 30 |
| DB03460 | XAT | Violaxanthin | 19 |
| DB03426 | DGD | Digalactosyl Diacyl Glycerol (Dgdg) | 11 |
| DB03279 | LMU | Dodecyl-Alpha-D-Maltoside | 10 |
| DB00137 | LUT | (3R,3'R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL | 9 |
| DB04450 | HTG | Heptyl 1-Thiohexopyranoside | 4 |
| DB01707 | LAP | L-Alfa-Lysophosphatidylcholine, Lauroyl | 3 |
| DB03690 | PCW | (Z,Z)-4-Hydroxy-N,N,N-Trimethyl-10-Oxo-7-[(1-Oxo-9-Octadecenyl)Oxy]-3,5,9-Trioxa-4-Phosphaheptacos-18-En-1-Aminium-4-Oxide | 3 |
| DB15914 | RRX | Cryptoxanthin | 3 |
| DB00143 | GSH | Glutathione | 1 |
| DB01022 | PQN | Phylloquinone | 1 |
| DB04038 | ERG | Ergosterol | 1 |
Most frequently bound compounds
| PDB ligand | Name | Domains in contact |
|---|---|---|
| CLA | CHLOROPHYLL A | 217 |
| BCR | BETA-CAROTENE | 200 |
| LMG | 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE | 83 |
| LHG | 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE | 43 |
| SQD | 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL | 24 |
| LMU | DODECYL-ALPHA-D-MALTOSIDE | 20 |
| DGD | DIGALACTOSYL DIACYL GLYCEROL (DGDG) | 19 |
| LUT | (3R,3'R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL | 19 |
| 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 | 12 |
| XAT | (3S,5R,6S,3'S,5'R,6'S)-5,6,5',6'-DIEPOXY-5,6,5',6'- TETRAHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL | 10 |
| F6C | Chlorophyll F | 9 |
| 8CT | (6'R,11cis,11'cis,13cis,15cis)-4',5'-didehydro-5',6'-dihydro-beta,beta-carotene | 7 |
| UNL | Unknown ligand | 7 |
| CHL | CHLOROPHYLL B | 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 |
| 3XQ | (2S)-2,3-dihydroxypropyl octadecanoate | 5 |
| HTG | heptyl 1-thio-beta-D-glucopyranoside | 5 |
| C7Z | (1~{S})-3,5,5-trimethyl-4-[(1~{E},3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E},17~{E})-3,7,12,16-tetramethyl-18-[(4~{S})-2,6,6-trimethyl-4-oxidanyl-cyclohexen-1-yl]octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohex-3-en-1-ol | 4 |
| CL7 | CHLOROPHYLL D | 4 |
| DD6 | (3S,3'R,5R,6S,7cis)-7',8'-didehydro-5,6-dihydro-5,6-epoxy-beta,beta-carotene-3,3'-diol | 4 |