| cpLAO-BP | circular permutated lysine-/arginine-/ornithine-binding protein |
| ECFP | enhanced cyan fluorescent protein |
| HPLC | high-performance liquid chromatography |
| FRET | Förster resonance energy transfer |
| ITC | isothermal titration calorimetry |
| LAO | l-lysine-/l-arginine-/l-ornithine- |
| nLAO-BP | native l-lysine-/l-arginine-/l-ornithine-binding protein |
| R0 | minimal FRET-ratio |
| Rsat | saturated FRET-ratio |