Abstract
pH affected significantly the growth and the glucose fermentation pattern of Propionibacterium microaerophilum. In neutral conditions (pH 6.5–7.5), growth and glucose fermentation rate (qs) were optimum producing propionate, acetate, CO2, and formate [which together represented 90% (wt/wt) of the end products], and lactate representing only 10% (wt/wt) of the end products. In acidic conditions, propionate, acetate, and CO2 represented nearly 100% (wt/wt) of the fermentation end products, whereas in alkaline conditions, a shift of glucose catabolism toward formate and lactate was observed, lactate representing 50% (wt/wt) of the fermentation end products. The energy cellular yields (Y X/ATP), calculated (i) by taking into account extra ATP synthesized through the reduction of fumarate into succinate, was 6.1–7.2 g mol−1. When this extra ATP was omitted, it was 11.9–13.1 g mol−1. The comparison of these values with those of Y X/ATP in P. acidipropionici and other anaerobic bacteria suggested that P. microaerophilum could not synthesize ATP through the reduction of fumarate into succinate and therefore differed metabolically from P. acidipropionici.
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Received: 8 April 2002 / Accepted: 8 May 2002
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Koussémon, M., Combet-Blanc, Y. & Ollivier, B. Glucose Fermentation by Propionibacterium microaerophilum: Effect of pH on Metabolism and Bioenergetic. Curr Microbiol 46, 0141–0145 (2003). https://doi.org/10.1007/s00284-002-3839-x
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DOI: https://doi.org/10.1007/s00284-002-3839-x