Letter | Published:

Evidence for phosphofructokinase in chloroplasts

Naturevolume 256pages429430 (1975) | Download Citation



ATTEMPTS to demonstrate phosphofructokinase activity in chloroplasts have so far been unsuccessful1–4, thus raising the question of whether the transitory starch formed in the chloroplast during photosynthesis can subsequently be metabolised to triose phosphates within the chloroplast. Such a conversion would seem beneficial if the products of starch degradation are required to move freely from the chloroplast to the cytoplasm, since triose phosphates, but not hexose phosphates, are actively and rapidly transported across the chloroplast membrane5. The apparent absence of phosphofructokinase from chloroplasts was also discouraging since this enzyme is considered one of the principal regulatory enzymes of carbohydrate metabolism6 and the regulatory properties of the plant enzyme have been shown consistent with the control of starch metabolism7. Investigations in this laboratory have now demonstrated that chloroplasts do contain phosphofructokinase activity.

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  1. Abteilung Chemische Pflanzenphysiologie, Technische Universität München, 8050, Weihenstephan, Germany

    • G. J. KELLY
    •  & E. LATZKO


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