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A Novel Link Between Electron Transport Chain Modulation and mcl-PHA Production in Pseudomonas aeruginosa 5300 Using
Raghavendra Paduvari1, Divyashree Somashekara1
1Department of Biotechnology, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India.
Environmental Microbiology Reports
|January 23, 2026
Summary
Pseudomonas aeruginosa produces more medium chain length polyhydroxyalkanoates (mcl-PHA) bioplastics faster using azide. This novel method enhances mcl-PHA yield by linking bacterial electron transport chains to bioplastic production.
Area of Science:
- Biotechnology
- Microbiology
- Polymer Science
Background:
- Medium chain length polyhydroxyalkanoates (mcl-PHA) are biodegradable bioplastics with limited large-scale production due to low yields and biomass reduction.
- Current methods often require prolonged nutrient limitation, impacting efficiency.
Purpose of the Study:
- To investigate a novel method for enhancing mcl-PHA production in Pseudomonas aeruginosa.
- To explore the role of azide in accelerating mcl-PHA synthesis under nutrient-rich conditions.
Main Methods:
- Cultivation of Pseudomonas aeruginosa MCC 5300 in tryptic soy broth with oleic acid.
- Addition of azide to assess its impact on mcl-PHA yield and production duration.
- Analysis of electron transport chain (ETC) shifts and cellular redox cofactor levels.
Main Results:
- Pseudomonas aeruginosa MCC 5300 achieved 39.4% cell dry weight (CDW) mcl-PHA in 24 hours.
- Azide application enhanced mcl-PHA content to 66.4% CDW.
- Oleic acid shifted the ETC, and azide inhibition of bo3-oxidase increased electron flux, leading to cofactor depletion.
Conclusions:
- Azide significantly enhances mcl-PHA production in Pseudomonas aeruginosa under nutrient-rich conditions.
- Increased mcl-PHA accumulation compensates for reduced-redox cofactor loss, maintaining cellular redox homeostasis.
- A novel link between the electron transport chain and mcl-PHA production is established.
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