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The social amoeba Dictyostelium discoideum expresses five ras genes at different stages of development. One of them,DdrasD is expressed during postaggregative development and transcription is induced by extracellular cAMP. A homologue of DdrasD, the DdrasG gene, is expressed exclusively during vegetative growth. We cloned two ras homologues Dmras1 andDmras2 from the primitive species D. minutum,...
Constitutive inhibition of cAMP-dependent protein kinase (PKA) in Dictyostelium cells blocks cell aggregation and development. We investigated the cause of the aggregation defect in transformants overexpressing dominant-negative PKA regulatory subunits (PKA-R M ) under an actin 15 promoter. These mutants could not relay pulses of the chemoattractant cAMP, due to a defect in expression of...
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