851 Phycoerythrin 545 alpha-subunits
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 |
|---|---|---|---|---|---|
| Homogeneous metal compounds | 3 | 6.3 | 0.48× | q = 0.14 | |
| Organoheterocyclic compounds | 13 | 2.0 | 6.59× | not tested | |
| Organic oxygen compounds | 2 | 2.6 | 0.78× | not tested | |
| Homogeneous non-metal compounds | 2 | 2.8 | 0.72× | 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
No DrugBank compounds are annotated on this group's domains.
Most frequently bound compounds
| PDB ligand | Name | Domains in contact |
|---|---|---|
| PEB | PHYCOERYTHROBILIN | 70 |
| DBV | 15,16-DIHYDROBILIVERDIN | 38 |
| AX9 | DiCys-(15,16)-Dihydrobiliverdin | 36 |
| CYC | PHYCOCYANOBILIN | 14 |
| KP9 | Bilin 618 (single linked) | 8 |
| KPX | Bilin 584 (single linked) | 8 |
| KQ6 | Bilin 584 (doubly linked) | 8 |
| CL | CHLORIDE ION | 4 |
| M1V | mesobiliverdin IX(alpha) | 4 |
| MGmetal | MAGNESIUM ION | 4 |
| X2I | (15,16)-DIHYDROBILIVERDIN (SINGLY LINKED) | 4 |
| P6G | HEXAETHYLENE GLYCOL | 2 |