Comamonas acidovorans
Lynsey Jorgenson

Comamonas acidovorans is a gram negative, rod-shaped bacterium. Davis and Park changed the name from Pseudomonas acidovorans to C. acidovorans in 1962. The reason for the change could not be found during research. This bacterium is a strict aerobe and a non-fermenter. It has a polar tuft of flagella (usually one or more) and is typically non-pigmented. It is a seemingly unusual bacterium in that it does not grow well on the typical simple sugars, instead preferring to feast on amino acids, peptone, and various organic acids for optimum growth. C. acidovorans does not have the ability to produce the enzyme glucose dehydrogenase so it cannot break down compound like glucose and 2-ketogluconate easily. Geographically C. acidovorans has been found in Japan, the Netherlands, Great Britain, the USA, Spain and Sweden. Due to its unusual “diet” it requires a selective enrichment medium and grows optimally at 30o C. The colonies are round and convex with a smooth to granular surface. The colonies are usually colorless but rarely exhibit a dark brown color in its colonies.

C. acidovorans is commonly found in soil, mud and water. There has been research to isolate this bacterium to find it purpose. It has been theorized that it plays a role in biodegradation. This come from when it was isolated from wood chips to study lignin biodegradation. Later C. acidovorans was found to be able to “attack” large numbers of complex chemicals. Some include unsaturated carboxylic acids, aromatic acids, and sterols. A confirming piece of research occurred when C. acidovorans was isolated out of oil brine, crude oil, and wastewater from the petroleum industry. After years of research scientists have determined that C. acidovorans has a vital role in natural biodegradation.

*Disclaimer - This report was written by a student participaring in a microbiology course at the Missouri University of Science and Technology. The accuracy of the contents of this report is not guaranteed and it is recommended that you seek additional sources of information to verify the contents.


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