A heterogeneous microbial consortium producing short-chain fatty acids from lignocellulose

Area of Science:

• Biotechnology
• Microbiology
• Biochemistry

Background:

• Microbial consortia offer advantages over single-strain cultures for complex biotransformations.
• Lignocellulose conversion into valuable chemicals is a key challenge in biotechnology.

Purpose of the Study:

• To develop a versatile consortium-based strategy for direct lignocellulose conversion to short-chain fatty acids.
• To engineer a microbial food chain funneling lignocellulosic carbohydrates to lactate as a central intermediate.

Main Methods:

• Utilized a spatial niche strategy for co-culturing aerobic fungi and anaerobic bacteria.
• Integrated specific anaerobic bacteria (Clostridium tyrobutyricum, Veillonella criceti, or Megasphaera elsdenii) into a lactate production platform.
• Quantified butyric acid production from beechwood feedstock.

Main Results:

• Achieved direct conversion of lignocellulose to short-chain fatty acids via a lactate intermediate.
• Demonstrated in situ enzyme production by an aerobic fungus in proximity to anaerobic bacteria.
• Produced 196 kg of butyric acid per metric ton of beechwood using integrated microbial consortia.

Conclusions:

• The lactate platform showcases the benefits of microbial consortia, including modularity and complex substrate conversion.
• This approach enables efficient production of valuable biochemicals from lignocellulosic biomass.
• Consortium-based strategies represent a promising alternative for sustainable bioproduction.