Table 7.
Peptidase families present in all seven organism kingdoms.
| Family | Type example |
|---|---|
| C56 | PfpI peptidase |
| M1 | membrane alanyl aminopeptidase |
| M3 | thimet oligopeptidase |
| M20 | glutamate carboxypeptidase |
| M48 | STE24 |
| M67 | isopeptidase Rpn11 |
| S1 | chymotrypsin |
| S8 | subtilisin |
| S9 | prolyl oligopeptidase |
| S12 | d-Ala-d-Ala carboxypeptidase B |
| S16 | endopeptidase La |
| S26 | signal peptidase 1 |
| S54 | rhomboid |
| T1 | proteasome |
Peptidase families widely distributed amongst phyla in each kingdom are assumed to have been present in the last universal common ancestor (LUCA).