Synthetic Biology of Polyhydroxyalkanoates (PHA)

Area of Science:

• Microbial biotechnology
• Polymer science
• Synthetic biology

Background:

• Polyhydroxyalkanoates (PHA) are biodegradable polyesters with broad applications.
• Current methods focus on improving PHA production and diversity using metabolic engineering.

Purpose of the Study:

• To engineer microbial platforms for producing diverse PHA structures, including functionalized and specific copolymers.
• To enhance PHA production efficiency and control polymer composition.

Main Methods:

• Genetic engineering of Pseudomonas putida and Pseudomonas entomophiles to modify fatty acid metabolism.
• Assembly of synthesis pathways for poly(3-hydroxypropionate) (P3HP) and its copolymers in Escherichia coli.
• Application of CRISPR interference (CRISPRi) for simultaneous gene manipulation and metabolic flux control in E. coli.
• Engineering bacterial cell shapes for improved PHA accumulation.

Main Results:

• Engineered bacteria can incorporate functionalized fatty acids into PHA, creating novel functional PHA varieties.
• Efficient production of P3HP and its copolymers from glucose was achieved in recombinant E. coli.
• CRISPRi enabled the synthesis of specific copolymers like P3HB4HB by controlling metabolic flux.
• Bacterial cell shape engineering led to enhanced PHA accumulation.

Conclusions:

• Synthetic biology and metabolic engineering provide powerful tools for tailoring PHA production and properties.
• Engineered microbial platforms offer versatile routes to synthesize a wide range of functional and structurally defined polyhydroxyalkanoates.
• These advancements pave the way for novel biodegradable materials with customized characteristics.