3--methylrhamnose was found in cell walls of . This sugar was purified and identified by proton and C nuclear magnetic resonance and mass spectroscopy, using the acetylation method. It is localized in the cell wall fraction and occurs at a constant ratio among the cell wall sugars when various carbon sources are used for growth. 3--methylrhamnose was found in nine strains of species containing MK-10 as the major menaquinone, but not in nine strains containing MK-9. Among 22 type strains of genera related to (, and “”), 4 strains contained only trace quantities, and the remainder contained none. Thus, we propose that 3--methylrhamnose is a key sugar in the chemotaxonomy of the genes .


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