The cytochrome bc1 complex but not CycM is necessary for symbiotic nitrogen fixation by Rhizobium leguminosarum

Article Abstract:

The cytochrome bc1 complex is necessary for symbiotic nitrogen fixation by rhizobia. This was gleaned from an analysis of mutants of Rhizobium leguminosarum defective in electron transport to cytochromes aa3 by screening for mutants defective in oxidation of the artificial electron donor N,N'-dimethyl-p-phenyl-enediamine. It was also found that the other membrane-bound c-type cytochrome is not part of the pathway involved in electron transport and is not essential for symbiotic nitrogen fixation.

Research, Cytochromes

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Rhizobium leguminosarum bv. viciae produces a novel cyclic trihydroxamate siderophore, vicibactin

Article Abstract:

The isolation of trihydroxamate siderophores from iron-deficient cultures of three strains of Rhizobium leguminosarum biovar viciae has been undertaken. The three strains all produced vicibactin and the gallium and ferrix complexes of vicibactin were extractable into benzyl alcohol at pH 5.0. At least three genes are thought to be involved in the synthesis of vicibactin from ornithine and beta-hydroxybutyrate.

Observations, Biosynthesis

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The Rhizobium leguminosarum bv. viciae glnD gene, encoding a uridylyltransferase/uridylyl-removing enzyme, is expressed in the root nodule but is not essential for nitrogen fixation

Article Abstract:

Research reveals that although a complete functional uridylyltransferase/uridylyl-removing enzyme is not involved in the nitrogen fixation per se in Rhizobium leguminosarum bv. viciae, portions of the nitrogen regulation system is required in sybiosis. Data further point out that the N-terminal part of the enzyme is essential for activity.

Italy, Germany, Statistical Data Included, Genetic aspects, Enzymes, Gene expression, Enzyme structure-activity relationships, Nitrogen metabolism

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