Uptake and Utilization of Sugar Phosphates by Anabaena flos-aquae

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Abstract
The effect of various sugar phosphates on CO2 fixation in A. flos-aquae was investigated and found to be very similar to that found for isolated spinach chloroplasts. One exception, G-6-P, has a stimulatory effect on CO2 fixation in Anabaena but not in isolated chloroplasts. Further examination of the role of G-6-P metabolism in Anabaena indicates that: this sugar phosphate can be taken up; its uptake is greater in the light than the dark; turnover of G-6-P is inhibited in the light; and G-6-P can support dark CO2 fixation. These results are discussed with reference to photosynthesis-related control of G-6-P metabolism and the role of G-6-P as a source of reducing equivalents and ATP in blue-green algae.