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Articles

Activities of Enzymes of the Oxidative and the Reductive Pentose Phosphate Pathways in Heterocysts of a Blue-Green Alga ¹

^a Michigan State University-Atomic Energy Commission Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48823

Preparations of heterocysts of Anabaena cylindrica Lemm. had 7- to 8-fold higher activities of glucose 6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase, 2-fold more hexokinase activity, and 0.02 to 0.06 times as much ribulose diphosphate carboxylase and glyceraldehyde 3-phosphate dehydrogenase activities as did whole filaments per milligram soluble protein in cell-free extracts. Time courses of solubilization of glucose 6-phosphate dehydrogenase activity indicated that heterocysts contain 74 to 80% of the total activity of this enzyme in filaments.

¹ This work was supported by the United States Atomic Energy Commission Contract AT-(11-1)-1338. F. W. received partial support from the Swiss National Foundation.

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