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Characterization of a Soluble NADH-Independent Nitrate Reductase from the Photosynthetic Bacterium Rhodopseudomonas capsulata

Abstract The assimilatory nitrate reductase was purified 60-fold from a newly isolated, nitrate assimilating strain of the photosynthetic bacterium Rhodopseudomonas capsulata. The enzyme had a molecular weight of about 180 000 dalton and was typically prokaryotic in that it was not active with reduced pyridine nucleotides but rather with reduced flavins.