Investigations
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Cyanobacterial PFKs were thought to be ATP dependent, but isolation and characterisation of 2 PFK isoenzymes from Synechocystis revealed that they belong to the PFK-A family, use ADP as phosphate donor and form a separate phylogenetic class. Their allosteric regulation via 3-PG and ATP respectively allow for flexible switching between aactive and inactive enzymes dependent on the light and carbon status.