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Articles

Uptake and Utilization of Sugar Phosphates by Anabaena flos-aquae¹

^a Department of Biology, Brooklyn College, Brooklyn, New York 11210

The effect of various sugar phosphates on CO₂ fixation in Anabaena flos-aquae was investigated and found to be very similar to that found for isolated spinach chloroplasts. One exception, glucose 6-phosphate, has a stimulatory effect on CO₂ fixation in Anabaena but not in isolated chloroplasts.

Further examination of the role of glucose 6-phosphate metabolism in Anabaena indicates that: (a) this sugar phosphate can be taken up; (b) its uptake is greater in the light than the dark; (c) turnover of glucose 6-phosphate is inhibited in the light; and (d) glucose 6-phosphate can support dark CO₂ fixation. These results are discussed with reference to photosynthesis-related control of glucose 6-phosphate metabolism and the role of glucose 6-phosphate as a source for reducing equivalents and ATP in blue-green algae.

³ To whom correspondence should be addressed.

¹ This research was supported by a Grant from General Telephone and Electronics Corp. and by grants from the Research Foundation of the City University of New York.