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Volume 139, Issue 12

Developmental and cAMP-mediated regulation of glycogen phosphorylase 1 in Free

Abstract

The glycogen phosphorylase-1 (gp-1) exhibits a complex pattern of developmental expression in which differential temporal regulation of enzyme activity, protein levels and mRNA levels is observed. This pattern of expression implies that gp-1 regulation occurs at multiple levels, probably involving both transcriptional and post-transcriptional events. Post-translational control of gp-1 activity, in effect, actually regulates the protein from a developmental perspective. In this report we have examined several facets of this regulation. We show that addition of exogenous cAMP to cells in suspension culture caused changes in gp-1 enzyme activity and mRNA levels that are identical to those observed during normal development, suggesting that cAMP is involved in the regulation of gp-1. Exogenous cAMP could regulate gp-1 mRNA expression at concentrations as low as 1·0 μ. cAMP regulation of gp-1 mRNA appeared to occur through a mechanism that required intracellular cAMP signalling. We identified regions of the promoter necessary for gp-1 expression by using gp-1 promoter deletions to drive the expression of a luciferase reporter gene. Results of these experiments suggested that developmental and cAMP-mediated changes in gp-1 mRNA levels were the result of alterations in transcription. The promoter analysis also suggested that a vegetative specific element is located between −785 and −1894 nucleotides from the transcriptional start site. Elements necessary for maximal developmental and cAMP-mediated expression appear to be located between −1153 and −1894 nucleotides from the cap site. Sequence elements located between −180 and −1153 appear to be required for a basal level of late developmental expression.

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© Society for General Microbiology, 1993
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1993-12-01
2024-04-26
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Developmental and cAMP-mediated regulation of glycogen phosphorylase 1 in Dictyostelium discoideum
Microbiology 139, 3043 (1993); https://doi.org/10.1099/00221287-139-12-3043
/content/journal/micro/10.1099/00221287-139-12-3043
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