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In treponemal cells, various carbohydrates are metabolized to produce lower fatty acids and alcohols. The characteristic end product patterns of the cultivable treponemes have been reported in Bergey's manual3) and Anaerobe laboratory manual (V.P.I. Manual)1). Treponema denticola and T. vincentii utilize fumarate without succinate formation, but, T. phagedenis and T. refringens form succinate from fumarate. Especially, Reiter treponeme form large amounts of butyrate via butyryl-CoA in the CoA transphorase system2). However, study of the metabolic pathway of oral Treponemes has been reported poorly. Oral Treponemes utilize carbohydrates and amino acids as major energy sources. It is noted that fumarate and succinate are important intermediates of the metabolic pathway in the cells of genus Treponema. The objective of the research described in this report is to clarify the end product patterns in several strains of Treponemes with the use of three media. The experimented strains were T. phagedenis Reiter and three oral Treponemes sp. E-21, T-2 and S-173. These oral Treponemes were isolated from the pus of human periodontal foci, and their physiological characteristics were reported elsewhere4). The four strains of Treponema were cultivated in the following three media for 7 days under anaerobic conditions (5% CO2, 95% N2); (1) Peptone yeast extract glucose medium supplemented with 10% horse serum

Effect of fumarate on the butyrate formation by certain species of genus Treponema.