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The catabolism of propane by “Nocardia paraffinicum ” (Rhodococcus rhodochrous ) has been shown to involve CO2 fixation after its oxidation to propionic acid. “N. paraffinicum ” failed to grow on either propane or 1-propanol in the absence of CO2 . The rate of propane utilization was directly related to the initial CO2 concentration, and Warburg respirometry suggested that CO2 was required for the catabolism of 1-propanol, propionaldehyde, and propionate but not for 2-propanol. These data also suggested that the predominant pathway for the utilization of propane by “N. paraffinicum ” was through 1-propanol. The use of [2-14 C]propane and14 CO2 confirmed the catabolism of propane and the fixation of CO2 . Through the use of these isotopes and the pyruvate carboxylase inhibitor sodium arsenite, the labeled 2,4-dinitrophenylhydrazine derivative of pyruvate was trapped and isolated via thin-layer chromatography. The trapping of [14 C]pyruvate in this manner was considered to be indicative of the presence of the methylmalonyl coenzyme A pathway for CO2 fixation.

Role of Carbon Dioxide in Catabolism of Propane by “ Nocardia paraffinicum ” ( Rhodococcus rhodochrous )