Summary: Menaquinones were the only isoprenoid quinones found in 40 strains representing 19 species of and . The strains had a characteristic profile consisting of major amounts of di-, tetra-, hexa- and octahydromenaquinones with ten isoprene units and were thereby distinguished from all of the other test strains which contained complex mixtures of hydrogenated menaquinones with nine isoprene units. The latter strains were divided into three groups based upon the predominant isoprenologue detected: (i) and contained hexahydrogenated menaquinones with nine isoprene units; (ii) and contained octahydrogenated menaquinones with nine isoprene units and (iii) , and contained tetrahydrogenated menaquinones with nine isoprene units. The results show that menaquinone profiles are of value both in generic and sub-generic classifications of . They also suggest that some species of and are closely related to , a result in line with other trends in the taxonomy of these organisms.


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