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The ubiquinone precursors, 2-octaprenyl-6-methoxy-1,4-benzoquinone and 2-octaprenyl-3-methyl-6-methoxy-1,4-benzoquinone, were isolated from ubiquinone-deficient mutants ofEscherichia coli and identified by nuclear magnetic resonance and mass spectrometry. Mutants accumulating 2-octaprenyl-6-methoxy-1,4-benzoquinone and 2-octaprenyl-3-methyl-6-methoxy-1,4-benzoquinone were shown to carry mutations in genes designatedubiE andubiF , respectively. TheubiE gene was shown to be cotransducible withmetE (minute 75) and close to two other genes concerned with ubiquinone biosynthesis. TheubiF gene was located close to minute 16 by cotransduction with thelip, gltA , andentA genes.

journal of bacteriology

Characterization and Genetic Analysis of Mutant Strains of <i>Escherichia coli</i> K-12 Accumulating the Ubiquinone Precursors 2-Octaprenyl-6-Methoxy-1,4-Benzoquinone and 2-Octaprenyl-3-Methyl-6-Methoxy-1,4-Benzoquinone

Characterization and Genetic Analysis of Mutant Strains of Escherichia coli K-12 Accumulating the Ubiquinone Precursors 2-Octaprenyl-6-Methoxy-1,4-Benzoquinone and 2-Octaprenyl-3-Methyl-6-Methoxy-1,4-Benzoquinone