181 Domain of the SRP/SRP receptor G proteins-like
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 non-metal compounds | 2 | 1.3 | 1.57× | not tested | |
| Organic acids and derivatives | 1 | 0.9 | 1.09× | not tested | |
| Homogeneous metal compounds | 3 | 2.9 | 1.03× | not tested | |
| Organic oxygen compounds | 1 | 1.2 | 0.85× | not tested | |
| Nucleosides, nucleotides, and analogues | 1 | 1.6 | 0.61× | 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 |
|---|---|---|---|
| DB04022 | G4P | Guanosine tetraphosphate | 3 |
Most frequently bound compounds
| PDB ligand | Name | Domains in contact |
|---|---|---|
| CDmetal | CADMIUM ION | 6 |
| MGmetal | MAGNESIUM ION | 5 |
| CAmetal | CALCIUM ION | 4 |
| NAmetal | SODIUM ION | 4 |
| G4P | GUANOSINE-5',3'-TETRAPHOSPHATE | 3 |
| IOD | IODIDE ION | 3 |
| RPI | phospho-arginine | 3 |
| MAN | alpha-D-mannopyranose | 2 |
| MRD | (4R)-2-METHYLPENTANE-2,4-DIOL | 2 |
| CL | CHLORIDE ION | 1 |
| Kmetal | POTASSIUM ION | 1 |