The electron transport system in nitrogen fixation by Azotobacter. III. Requirements for NADPH-supported nitrogenase activity |
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| Authors: | J R Benemann D C Yoch R C Valentine and Daniel I Arnon |
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| Institution: | Departments of Biochemistry and Cell Physiology, University of California, Berkeley, Calif. 94720, U.S.A. |
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| Abstract: | Evidence has been obtained that NADPH may serve as a physiological source of reducing power for nitrogenase activity in Azotobacter vinelandii. NADH was ineffective. Electron transfer from NADPH to nitrogenase depended on four factors native to A. vinelandii cells: azotobacter ferredoxin, azotoflavin, a component replaceable by spinach ferredoxin-NADP+ reductase and another soluble, heat-labile component not yet chemically characterized. The four factors probably constitute an electron transport chain between NADPH and nitrogenase. |
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