The Genus Citrobacter

  • SECTION 3.3 Gamma Subclass
  • Reference work entry
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The Prokaryotes

Introduction

Members of the genus Citrobacter are Gram-negative, nonsporeforming rods belonging to the family Enterobacteriaceae and, as the name suggests, usually utilize citrate as a sole carbon source. These facultative anaerobes typically are motile by means of peritrichous flagella. They ferment glucose and other carbohydrates with the production of acid and gas. They are oxidase negative, catalase and methyl red positive, Voges-Proskauer negative, and do not decarboxylate lysine. Taxonomically, the genus Citrobacter is most closely related to Salmonella and Escherichia.

In 1928, Braak described two strains of bacteria capable of forming trimethylene glycol from glycerol under anaerobic conditions. In honor of Freund's 1881 observation of trimethylene glycol as a fermentation product of glycerol, the strains were designated “Bacterium freundii” (Braak, 1928). One of these strains (ATCC 8454) was among the citrate-utilizing, lactose-fermenting coliforms that Werkman and Gillen...

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Borenshtein, D., Schauer, D.B. (2006). The Genus Citrobacter. In: Dworkin, M., Falkow, S., Rosenberg, E., Schleifer, KH., Stackebrandt, E. (eds) The Prokaryotes. Springer, New York, NY. https://doi.org/10.1007/0-387-30746-X_5

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