Inorganic polyphosphate and exopolyphosphatase in the nuclei of Saccharomyces cerevisiae: dependence on the growth phase and inactivation of the PPX1 and PPN1 genes.

Nuclei of the yeast Saccharomyces cerevisiae possess inorganic polyphosphates (polyP) with chain lengths of ca. 10-200 phosphate residues. Subfractionation of the nuclei reveals that the most part of polyP is not associated with DNA.