TABLE 3.
APT activity in the presence of various amine acceptors
| Substratea | Enzyme activity (nmol/min/mg)b | Relative activity (%) |
|---|---|---|
| Cadaverine | 1,903 ± 10 | 100 |
| Putrescine | 167 ± 8 | 8.7 |
| Agmatine | 93 ± 5 | 4.9 |
| 1,3-Diaminopropane | 56 ± 3 | 2.9 |
| Sym-nor-spermidine | 18 ± 1 | 0.9 |
| Spermidine | 16 ± 1 | 0.8 |
| Sym-nor-spermine | ND | <0.1 |
| Spermine | ND | <0.1 |
a
Each polyamine substrate was at a saturating concentration.
b
The enzymatic assay was carried out as described in Materials and Methods. Values are the means of the results (± the standard deviations) of three separate experiments. ND, not detectable.