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. 1973 Sep;115(3):1035–1044. doi: 10.1128/jb.115.3.1035-1044.1973

Physiological Effects of Menaquinone Deficiency in Bacillus subtilis

S K Farrand a,1, H W Taber a
PMCID: PMC246351  PMID: 4353869

Abstract

Several aspects of the respiratory physiology of a mutant of Bacillus subtilis deficient in menaquinone-7 (MK-7) and in cytochromes were investigated. The mutant, an aromatic amino acid auxotroph blocked at dehydroshikimate reductase, is unable to synthesize MK-7 unless grown in the presence of the common aromatic amino acid intermediate, shikimate. The inability to synthesize MK-7 prevents the mutant from expressing the normal postexponentialphase cytochrome phenotype. When grown in the presence of shikimate, normal levels of these electron transport components are formed. It was found that the intracellular concentration of MK-7 could be predictably regulated by growing the cells with known concentrations of exogenous shikimate. When the mutant was grown under conditions where MK-7 biosynthesis was severely limited, there was a decrease in oxygen uptake and in membrane-associated reduced nicotinamide adenine dinucleotide (NADH) oxidase and succinate oxidase activity. NADH oxidase, but not succinoxidase, could be restored in membrane preparations by the addition of menadione to the reaction mixture. Reduced-minus-oxidized cytochrome difference spectra indicate that an MK-7 deficiency limits electron flow through the cytochrome chain. Furthermore, oxidation-reduction patterns suggest that MK-7 functions between the primary dehydrogenases and the cytochromes. Although the mutant is asporogenous when grown under conditions where MK-7 biosynthesis is limited, the inability to sporulate does not appear to result from lesions in the electron transport system.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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