Abstract
Heterocyst preparations have been obtained which actively perform nitrogen fixation (C 2H 2 reduction) and contain the enzymes of glycolysis and some of the tricarboxylic acid cycle. Pyruvate: ferredoxin oxidereductase has been unambiguously demonstrated in extracts from heterocysts by the formation of acetylcoenzyme A, CO 2 and reduced methyl viologen (ferredoxi) from pyruvate, coenzyme A and oxidized methyl viologen (ferredoxin) as well as by the synthesis of pyruvate from CO 2, acetylcoenzyme A and reduced methyl viologen. Pyruvate supports C 2H 2 reduction by isolated heterocysts, however, with lower activity than Na 2S 2O 4 and H 2. α-Ketoglutarate: ferredoxin oxidoreductase is absent in Anabaena cylindrica, confirming that the organism has an incomplete tricarboxylic acid cycle.
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