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Strain GolChi1T, a mesophilic, anaerobic bacterium, was isolated with quinic acid (1,3,4,5-tetrahydroxy-cyclohexane-1-carboxylic acid) as the sole source of carbon and energy. Of more than 30 substrates tested, only the hydroaromatic compounds quinic acid and shikimic acid (3,4,5-trihydroxy-1-cyclohexene-1-carboxylic acid) were utilized, yielding acetate and propionate as the only fermentation products. Sugars, alcohols, (di-)carboxylic acids, amino acids and aromatic compounds were not fermented and no external electron acceptors were used. Strain GolChi1T is a gram-negative, rod-shaped, aerotolerant anaerobe that possesses superoxide dismutase; it does not employ the classical hydroaromatic pathway of aerobic bacteria for the degradation of hydroaromatic compounds (no aromatic intermediates involved). 16S-rRNA-based phylogenetic analyses revealed a common origin of this isolate and Rhodocyclus, Propionibacter and Propionivibrio species. High sequence similarity (&gt; 96%) and phenotypic traits indicated a closer relationship between strain GolChi1T and the type species of the monospecific genera Propionivibrio and Propionibacter but, due to its phenotypic properties, strain GolChi1T could not be assigned conclusively to either of these taxa. We propose (i) the amended description of the genus Propionivibrio, (ii) the reclassification of Propionibacter pelophilus Meijer et al. 1999 as Propionivibrio pelophilus comb. nov. and (iii) designation of Propionivibrio limicola sp. nov., with the type strain GolChi1T (= DSM 6832T = ATCC BAA-290T).

international journal of systematic and evolutionary microbiology

Propionivibrio limicola sp. nov., a fermentative bacterium specialized in the degradation of hydroaromatic compounds, reclassification of Propionibacter pelophilus as Propionivibrio pelophilus comb. nov. and amended description of the genus Propionivibrio.