Developing Clostridia as Cell Factories for Short- and Medium-Chain Ester Production

Area of Science:

• Biotechnology
• Microbiology
• Synthetic Biology

Background:

• Volatile esters are key flavor and fragrance compounds in food, brewing, and pharmaceuticals.
• Microorganisms naturally produce esters, but engineering non-natural hosts offers greater potential.
• Clostridia are industrially relevant due to their high production of alcohols and organic acids, precursors for ester synthesis.

Purpose of the Study:

• To review current efforts in producing volatile esters using Clostridia.
• To discuss the potential of Clostridia as hosts for bio-ester production.
• To highlight the role of synthetic biology in advancing clostridial ester production.

Main Methods:

• Review of *in vitro* lipase-mediated catalysis for ester production.
• Review of *in vivo* alcohol acyltransferase (AAT)-mediated reactions in Clostridia.
• Discussion of clostridial chassis development driven by synthetic biology.

Main Results:

• Clostridia possess inherent metabolic capabilities suitable for ester precursor production.
• Engineering Clostridia offers a promising route for sustainable bio-ester synthesis.
• Various Clostridia strains and consortia show advantageous characteristics for bio-ester production.

Conclusions:

• Clostridia are highly promising hosts for engineered volatile ester production.
• Synthetic biotechnology advancements are crucial for developing efficient clostridial bio-factories.
• Further research can unlock the full potential of Clostridia for industrial ester synthesis.