1887

Abstract

The rate of biosynthesis of nitrogenase polypeptides in was determined in a medium containing NaNO or NaNO. Nitrogenase biosynthesis was completely repressed by NO in a mutant strain, strain SK-25, that is derepressed for nitrogenase biosynthesis in the presence of NH . Chlorate-resistant mutants, derived from strain SK-25, that are defective in NO respiration produced nitrogenase in the presence of NO . Strain SK-561, a chlorate-resistant derivative capable of NO respiration, produced no nitrogenase in the presence of NO or NO . respired under anaerobic conditions utilizing either NO or NO as terminal electron acceptor. A mechanism for the control of nitrogenase biosynthesis is discussed involving the redox control of anaerobic enzyme systems.

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1980-03-01
2021-05-16
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