Engineering xylose induction in Vibrio natriegens for biomanufacturing applications

Area of Science:

• Microbiology
• Synthetic Biology
• Biotechnology

Background:

• Xylose is an abundant, inexpensive carbohydrate found in renewable feedstocks like seaweed and algae.
• Vibrio natriegens is a rapidly growing, Gram-negative halophilic bacterium suitable for bioproduction.
• Limited microbial chassis exist with the necessary genetic tools for utilizing underutilized feedstocks.

Purpose of the Study:

• To engineer and test xylose induction in Vibrio natriegens for scalable bioproduction.
• To optimize xylose-inducible gene expression in V. natriegens.
• To demonstrate the production of melanin using engineered V. natriegens and seaweed-derived inducers.

Main Methods:

• Constructed a xylose-inducible sensing system using the Escherichia coli xylose operon and a fluorescent reporter.
• Investigated the role of cellular import and the XylR transcription factor in xylose induction.
• Modified promoter regions to enhance gene expression and mitigate carbohydrate repression.
• Produced melanin using engineered V. natriegens with seaweed extract as an inducer.

Main Results:

• Cellular import and the XylR transcription factor are critical for xylose induction strength.
• Deletions in the promoter region improved gene expression and reduced carbohydrate repression.
• Melanin production yields comparable to traditional methods were achieved using a nori-based seaweed extract inducer.
• Demonstrated the feasibility of using renewable, low-cost inducers for biomanufacturing.

Conclusions:

• Engineered xylose induction in V. natriegens offers an effective and economical tool for timed biosynthesis.
• This approach supports scalable biomanufacturing using renewable feedstocks.
• Optimized V. natriegens strains provide a promising chassis for sustainable bioproduction.