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In the growth course of the lipolytic yeast Yarrowia lipolytica, the activities of protein phosphatase 2A (PP2A) and glycogen synthase (GS) rise during the exponential phase and concomitantly glycogen storage occurs in the cells. There is also an increase in the independence ratio (RI) indicating a shift from an inactive phosphorylated GS form to an active dephosphorylated GS form. During the early...
Intracellular protein phosphatase activity has been identified in the yeast Yarrowia lipolytica. This activity was maximal early in its exponential growth phase, and it was enhanced by Pi-deficiency of the culture medium. On a Pi-deficient medium, the major protein phosphatase was purified. This enzyme was dissociated with 80% ethanol treatment, its activity was slightly increased (30%) with heparine...
A reconstituted thylakoid system including isolated spinach thylakoids, ferredoxin, thioredoxin andferredoxin-thioredoxin reductase (FTR) was shown to provide sufficient electron transfer flow to mediate photoactivation of sedoheptulose-1,7-bisphosphatase (SBPase). Progress curves were linear under these conditions, in contrast to the lags observed after reductive activation of SBPase by DTT. In this...
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