Genome engineering of E. coli for improved styrene production

Area of Science:

• Biotechnology
• Synthetic Biology
• Metabolic Engineering

Background:

• Microbial production of complex organic compounds, like biogenic styrene, faces challenges due to toxic intermediates and complex pathways.
• Biogenic styrene is a key component in the plastics industry, and its sustainable production is highly desirable.

Purpose of the Study:

• To engineer Escherichia coli (E. coli) for enhanced production of biogenic styrene.
• To overcome host toxicity and improve styrene yield through systematic pathway optimization and mutant screening.

Main Methods:

• Screening of various pathway expression levels in E. coli strains.
• Construction and testing of a large transcription regulator library (85,420 mutations) targeting 54 genes.
• Selection of mutants exhibiting increased styrene tolerance and production.

Main Results:

• Engineered E. coli strains demonstrated improved styrene tolerance.
• Mutant strains achieved significantly higher styrene concentrations compared to the parent strain.
• The best mutant, ST05 LexA_E45I, exhibited a 3.45-fold increase in styrene production.
• Produced styrene was successfully extracted and used for polystyrene synthesis.

Conclusions:

• Metabolic engineering of E. coli can enable sustainable biogenic styrene production.
• Transcription regulator engineering is an effective strategy for enhancing tolerance and yield of toxic compounds.
• This approach offers a promising route towards a more sustainable plastics industry.