Cytochrome content of two pseudomonads containing mixed-function oxidase systems

Area of Science:

• Microbiology
• Biochemistry

Background:

• Pseudomonas species possess mixed function oxidase systems.
• These systems are induced by specific energy sources like hexane and camphor.
• Understanding the protein content is crucial for microbial metabolism studies.

Purpose of the Study:

• To investigate the changes in cytochrome and nonheme iron protein content in Pseudomonas oleovorans and Pseudomonas putida.
• To correlate these changes with the induction of mixed function oxidase systems by specific substrates.

Main Methods:

• Culturing Pseudomonas oleovorans and Pseudomonas putida on specific substrates (hexane, camphor).
• Quantifying protoheme, nonheme iron protein, cytochrome c, cytochrome P-450, and cytochrome o content.
• Comparing protein levels in induced versus uninduced cells.

Main Results:

• Protoheme content significantly increased in both species when grown on substrates for mixed function oxidation.
• Nonheme iron protein content increased in P. putida but remained constant in P. oleovorans.
• Cytochrome P-450 was detected in P. putida but not in P. oleovorans, while cytochrome o increased in P. oleovorans.

Conclusions:

• Growth on specific substrates significantly alters the cytochrome and nonheme iron protein profiles of Pseudomonas species.
• P. putida and P. oleovorans exhibit differential regulation of these proteins in response to mixed function oxidase induction.
• The findings highlight the metabolic flexibility and specific enzymatic machinery of these bacteria.