RT Journal Article SR Electronic(1) A1 Fynn, G. H. A1 Thomas, D. V. A1 Seddon, B.YR 1972 T1 On the Role of Menaquinone in the Reduced Nicotinamide Adenine Dinucleotide Oxidative Pathway of Bacillus brevis JF Microbiology, VO 70 IS 2 SP 271 OP 275 DO https://doi.org/10.1099/00221287-70-2-271 PB Microbiology Society, SN 1465-2080, AB SUMMARY Ultraviolet spectroscopy, partition chromatography and mass spectroscopy showed that the only quinone isolated from Bacillus brevis was menaquinone-7. The concentration of quinone present in electron-transport particles was consistent with its participation as an oxido-reduction component. Loss in NADH oxidase activity after ultraviolet irradiation or pentane extraction correlated with the degradation or removal respectively of menaquinone-7 present in the electron transport particles. Attempts to restore NADH oxidase activity either with ultraviolet-treated or pentane-extracted particles using the natural menaquinone were unsuccessful, although lower menaquinone homologues stimulated activity., UL https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-70-2-271