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Bioassay for the Isolation of Dictyostelium discoideum Mutants Deficient in Extracellular Accumulation of Cyclic Adenosine 3′,5′-Monophosphate

By Raquel R. Sussman


The growth response to external cyclic adenosine 3′,5′-monophosphate of a strain of Escherichia coli deleted for adenyl cyclase was utilized to screen for mutants of Dictyostelium discoideum unable to accumulate this chemical extracellularly. The threshold amount of cyclic adenosine 3′,5′-monophosphate able to induce growth of this bacterium was 3 to 4 μg/ml at 37 C and approximately 25 μg/ml at 27 C. Conditions are described that permit the detection of as low as 2 μg of this chemical at either temperature

Topics: Physiology and Metabolism
Year: 1974
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Provided by: PubMed Central
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