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pubmed-article:6813314pubmed:abstractTextActivating enzyme (AE) is responsible for the in vitro activation of inactive Fe protein of nitrogenase from Rhodospirillum rubrum cells cultured anaerobically with glutamate as the N source. The expression of Fe protein and AE was examined in R. rubrum cultured photosynthetically or aerobically on media containing malate as the carbon source. One of the following N sources was used in each culture: glutamate, glutamine, limiting ammonia, high ammonia, glutamate plus histidine, and high ammonia plus histidine. Chromatophores from every culture exhibited AE activity; activity was highest in glutamate-grown cells. Fe protein was observed by rocket immunoelectrophoresis in cultures with nitrogenase activity. Several Nif-, Gln-, and His- mutants of R. rubrum were assayed for AE activity, nitrogenase activity, and Fe protein. Every mutant expressed AE activity, and Fe protein was observed in those cultures with nitrogenase activity. AE from every preparation was O2 labile, and each O2-denatured AE preparation inhibited activation by active AE.lld:pubmed
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pubmed-article:6813314pubmed:articleTitleExpression of the activating enzyme and Fe protein of nitrogenase from Rhodospirillum rubrum.lld:pubmed
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