| Enzyme | Activity with different substrates | |
| Substrate | Activity, mU/ml | |
| PPN1 | PolyP208 | 244.0 ± 28.5 |
| PPN1 | dATP | 34.9 ± 3.9 |
| PPX1 | PolyP208 | 311 ± 32.0 |
| PPŠ„1 | dATP | 0 |