Microbial oxidation and assimilation of propylene

Area of Science:

• Microbiology
• Biochemistry

Background:

• Hydrocarbon-utilizing microorganisms are crucial for environmental remediation and industrial processes.
• Propylene, a common industrial chemical, is not readily utilized as a sole carbon and energy source by many known microbes.

Purpose of the Study:

• To isolate and characterize microorganisms capable of utilizing propylene as a sole carbon and energy source.
• To elucidate the metabolic pathway involved in propylene utilization by these microorganisms.

Main Methods:

• Isolation of microbial cultures from soil samples.
• Growth experiments with propylene as the sole carbon and energy source.
• Enzyme assays, respiration rate measurements, fatty acid profiling, and 14CO2 incorporation experiments to determine metabolic pathways.

Main Results:

• A mixed culture and an axenic culture (strain PL-1) were isolated, both capable of utilizing propylene as a sole carbon and energy source.
• Propane-grown cells of Mycobacterium convulutum oxidized propylene to acrylate but could not use it as a sole carbon source.
• Metabolic studies indicate that strain PL-1 and the mixed culture oxidize propylene via attack at the double bond, leading to a C2+C1 cleavage.

Conclusions:

• Specific microorganisms capable of complete propylene catabolism have been identified.
• The metabolic pathway involves initial attack at the propylene double bond, followed by fragmentation.
• These findings contribute to the understanding of microbial hydrocarbon metabolism and open possibilities for biotechnological applications.