title: Molecular analysis of cDNA clones and the corresponding genomic coding sequences of the Drosophila dunce+ gene, the structural gene for cAMP phosphodiesterase.
abstract: We have isolated and sequenced cDNA clones representing portions of the polyadenylylated transcripts of the dunce+ gene. These define an open reading frame of 1086 bases and some of the 5'- and 3'-untranslated regions of the transcripts. The deduced amino acid sequence is strikingly homologous to the amino acid sequence of a Ca2+/calmodulin-dependent cyclic nucleotide phosphodiesterase isolated from bovine brain and more weakly related to the predicted amino acid sequence of a yeast cAMP phosphodiesterase. These homologies, together with prior genetic and biochemical studies, provide unambiguous evidence that dunce+ codes for a phosphodiesterase. In addition, the dunce+ gene product shares a seven-amino acid sequence with a regulatory subunit of cAMP-dependent protein kinase that is predicted to be part of the cAMP binding site. We also identify a weak homology between a region of the dunce+ gene product and the egg-laying hormone precursor of Aplysia californica. The open reading frame is divided in the genome by four introns.
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000235:genetics*; D001048:Aplysia / Q000235:genetics; D001483:Base Sequence; D001665:Binding Sites; D003001:Cloning, Molecular; D000242:Cyclic AMP / Q000378:metabolism; D004247:DNA / Q000235:genetics; D004331:Drosophila melanogaster / Q000201:enzymology / Q000235:genetics*; D005796:Genes; D007447:Invertebrate Hormones / Q000235:genetics; D007858:Learning / Q000502:physiology*; D011494:Protein Kinases / Q000235:genetics; D012689:Sequence Homology, Nucleic Acid
chemical_list: D007447:Invertebrate Hormones; C026880:egg-laying hormone, Mollusca; D004247:DNA; D000242:Cyclic AMP; D011494:Protein Kinases; D015105:3',5'-Cyclic-AMP Phosphodiesterases