Abstract
The pool sizes of ribonucleoside and deoxyribonucleoside triphosphates were determined in the synchronous mitotic cycle of the acellular slime mold Physarum polycephalum. Averaged over the whole mitotic cycle the pool of all four ribonucleoside triphosphates was found to be 32.0 μmoles/g protein and that of the deoxyribonucleoside triphosphates 0.63 μmoles/g protein. For the eight nucleoside triphosphates the following average pool sizes were found, expressed in μmole/g protein: ATP 18.6, GTP 5.37, CTP 2.77, UTP 5.20, dATP 0.028, dGTP 0.077, dCTP 0.18, dTTP 0.33. At the beginning of the S phase and shortly before it, the pools of all four deoxyribonucleoside triphosphates are higher than in the middle of the G2 period. This pattern is particularly noticeable for dATP and dCTP, for which the pools expand by a factor of more than five.
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