PFK-1 and PFK-2 kinetics

The Deutsche Forschungsgemeinschaft (DFG) is the self-governing organisation for science and research in Germany. It serves all branches of science and the humanities. In organisational terms, the DFG is an association under private law. Its membership consists of German research universities, non-university research institutions, scientific associations and the Academies of Science and the Humanities.

Cyanobacteria are the only prokaryotes performing oxygenic photosynthesis. Theyhad and have tremendous influence on the biogeochemical cycles on Earth. Recently,cyanobacteria are increasingly investigated as cell factories for a sustainableeconomy. Despite their global, environmental and rising economic importance, ourknowledge on the regulation of their primary metabolism is fragmented.Cyanobacteria switch between photoautotrophic and heterotrophic modes ofmetabolism during day/night cycles or ...

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.

The purified enzymes were kinetically charactyerised in terms of substrate sensitivity and alloestric regulation.

The experimental data for PFK-1 and PFK-2 were analysed and fitted with a MWC equation. The model is described in Mathematica and the plots in the manuscript are generatedin the notebook.

Experimental data for kinetic characterisaton of PFK-1 and PFK-2.

Mathematic notebook for enzyme kinetic analysis and model fit, including figure generation for manuscript.