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The pool of ribonucleoside triphosphates in synchronized Tetrahymena pyriformis.

Measurements of the molar concentration of ATP in the cell are of interest either for evaluating possible interactions of ATP with other kinds of molecule (for example, chelating and allosteric interactions) or for estimating the energy potential of the cell. The aim of this work, supplemented by results to be presented in a later paper, was primarily to provide data on the above-mentioned interactions and, particularly, to study the possible regulatory effect of changes in nucleoside triphosphate (NTP) concentration on the translational level of protein synthesis, as a continuation of earlier studies (Plesner, 1964; Leick & Plesner, 1968). This paper describes the use of a sensitive thin-layer chromatography method for the determination of all four ribonucleoside triphosphates. The results confirm and extend earlier results obtained by other workers and ourselves (Scherbaum et al., 1962; Plesner, 1964) and show that substantial changes in the cellular concentrations of all the four nucleotides occur during the division cycle. The variations are of such a magnitude that it seems justified to suggest that the changes in NTP concentration might act as regulatory signals for cell division.