We tested the effect of the GTS1 gene of the yeast Saccharomyces cerevisiae on the cyanide-induced ultradian oscillation of the glycolytic metabolite NADH in cell suspension of strains with different copy numbers of the gene, that is, the wild-type, GTS1-disrupted and GTS1-overexpressing strains. The cells showed long-lasting oscillations when harvested between 1 and 2 hours after the diauxic shift from glucose to ethanol as a growth substrate. The frequencies of oscillation did not vary very much among the three strains tested. However, the amplitudes and durations of the oscillation were changed significantly as a function of the GTS1 gene-dosage. The effect of GTS1 on the amplitude was not caused by changing rates of glucose incorporation into cells as the rates were the same among the three strains during the macroscopic oscillation.