Summary: Menaquinones were the only isoprenoid quinones found in 85 of the 95 coryneform bacteria examined. Dihydromenaquinones having nine isoprene units were the main components isolated from , from other glutamic acid-producing strains, and from and related species. Dihydromenaquinones with eight isoprene units were found in , the remaining species and strains probably belonging to the genus . Tetrahydromenaquinones with eight isoprene units were found in and , and with nine isoprene units in and and were characterized by menaquinones with seven and nine isoprene units, respectively, and and had comparable amounts of menaquinones with 10 and 11 isoprene units. Strains received as and contained ubiquinones as their sole isoprenoid quinones. The isoprenoid quinone data correlate well with major trends in coryneform taxonomy and are of value in the classification of coryneform and related bacteria.


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