P I Kakebeeke

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Folic acid attracts vegetative amoebae of Dictyostelium discoideum. Secreted by bacteria, it may act as a food-seeking device. The inactivation of this attractant is catalyzed by a deaminase. As assay has been developed to measure the folic acid deaminase activity. In addition to cell-surface an intracellular deaminase, the amoebae of D. discoideum release(More)
Aggregative amoebae of Dictyostelium minutum are not attracted by cyclic AMP; they are sensitive to various attracting sources from which yeast extract was chosen to purify the chemoattractant. A small acrasin-like species-specific molecule which contains glycine and C5H5N5 has been purified 30,000-fold. Several characteristics of this chemotactic molecule,(More)
After sta~ation, amoebae of the cellular slime molds secrete acrasin [l] by which they attract each other and form an aggregate that differentiates into stalk cells and spores. In a favourable environment spores germinate yielding amoebae which feed on bacteria and m~tiply. Vegetative amoebae are also sensitive to chemotactic stimuli [4,6], which differ(More)
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