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• W2085651106 abstract "Abstract The effect of metabolic regulators on carbohydrate degradation, which supplies electrons for nitrogen fixation in heterocysts, was investigated. Measurements of nitrogenase and enzyme activities in a cell-free system showed that (1) phosphoenol pyruvate interfered with fructose 1,6-bisphosphate aldolase activity and (2) dithiothreitol (via thioredoxin) inactivated glucose 6-phosphate dehydrogenase, whereas (3) NADPH inhibited both glucose 6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase in a similar way. Nevertheless, a high reductant charge ( NADPH NADP + NADPH ) of more than 0.95 was maintained under nitrogen-fixing conditions. This supports the view that NADPH generation by carbohydrate degradation via the oxidative pentose-phosphate cycle serves as main electron source for nitrogen fixation. A stoichiometric relationship between substrate dissimilation and acetylene formation suggested a complete turnover to supply two electrons to nitrogenase. Addition of ammonium ions specifically inhibited electron flow to nitrogenase with ribose 5-phosphate as substrate, suggesting interference with the anaerobic rearrangement reactions of the oxidative pentose-phosphate cycle." @default.
• W2085651106 created "2016-06-24" @default.
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• W2085651106 date "1987-04-01" @default.
• W2085651106 modified "2023-09-27" @default.
• W2085651106 title "Regulation of electron flow to nitrogenase in a cell-free system from heterocysts of Anabaena variabilis" @default.
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• W2085651106 doi "https://doi.org/10.1016/0005-2728(87)90003-x" @default.
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