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A novel type of pyrophosphate fructose-6-phosphate 1-phosphotransferase (PFP) has been purified from carrot roots. The enzyme differs from its counterpart studied from other sources in subunit composition, response to regulatory metabolites and kinetic parameters. The properties of the enzyme are in accord with its function in a tissue that stores substantial quantities of sucrose. In describing the...
Metabolites known to occur in the cytosol of photosynthetic leaf cells were found to mediate the reversible conversion of pyrophosphate-D-fructose-6-phosphate 1-phosphotransferase (PFP) to phosphofructokinase (PFK) in partially purified preparations from spinach leaves. Preincubation of PFP with fructose 2,6-bisphosphate, ATP or fructose 6-phosphate converted PFP to PFK. The reverse reaction (PFK...
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