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6-Phosphofructo-2-kinase (PFK-2)/fructose-2,6-bisphosphatase (FBPase-2) catalyzes the synthesis and degradation of fructose 2,6-bisphosphate, a potent stimulator of glycolysis. Transcription of the mRNA encoding rat liver PFK-2/FBPase-2 is stimulated by insulin and by glucocorticoids in rat hepatoma cells. We show here that insulin can also prevent and reverse this glucocorticoid effect. The inhibitory...
DNA supercoiling is known to influence promoter activity in vitro and in vivo in a promoter-dependent manner in prokaryotes. In order to investigate how topology may influence promoter function, we have studied two kinds of promoter variants, (i) where only the spacer region is altered, and (ii) where the same promoter is tandemly repeated in either the same or opposite orientation. These promoters...
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