Abstract
This chapter focuses on polyamines and their metabolism in Dictyostelium discoideum. In Dictyostelium discoideum, the development phase is accompanied by dramatic changes in the metabolism of nucleic acids and proteins. For example, changes in RNA metabolism have been reported including a rapid loss of cellular RNA during development, the total replacement of ribosomal subunits, and alterations in the types of RNA transcripts formed. The polyamine content of Dictyostelium discoideum is similar to that of other lower eukaryotes such as Physarum polycephalum, Tetrahymena pyriformis and Blastocladiella emersonii, and differs from that of fungi and higher eukaryotes that have less putrescine than spermidine, and significant levels of spermine. Although the development of Dictyostelium discoideum is accompanied by a decrease in the cellular content of putrescine and spermidine, it is unlikely that this represent a major change in cellular concentration. Myxamoebae contain sufficient putrescine and spermidine cationic charge to neutralize considerably more than 100% of the nucleic acid phosphate.
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