Summary: Following the discoveries that the divalent cation ionophore A23187 and the divalent cation chelating agent EDTA can be used to synchronize yeast cell division, a study has been undertaken of the possible use of other chelating agents and antibiotics which interact with divalent cations in controlling cell division in the fission yeast All the agents studied (five chelators and two antibiotics) arrested cell division in growing cultures of this yeast, but only sodium pyrophosphate and citrate induced synchrony of cell division. Novobiocin produced a transient inhibition of cell division, treated cells exhibiting “endogenous recovery” in the continued presence of the antibiotic. The results obtained are discussed in relation to the hypothesis that the concentration of intracellular Mg regulates cell division.


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