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Updated: Oct 27, 2025

Design of Solid-State Fermentation Systems for Polymer Hydrolytic Extracellular Enzyme Production by Filamentous Fungi

Design of Solid-State Fermentation Systems for Polymer Hydrolytic Extracellular Enzyme Production by Filamentous Fungi

Published on: June 6, 2025

A cell engineering approach to enzyme-based fed-batch fermentation.

Michael Sibley¹, John M Ward²

¹Department of Biochemical Engineering, UCL, Gower Street, London, WC1E 6BT, UK.

Microbial Cell Factories

|July 25, 2021

Summary

This summary is machine-generated.

This study engineered an E. coli strain that secretes enzymes to convert starch directly into glucose, enabling high-density fermentation. This novel approach increases cell density and recombinant protein yield using starch as a sole carbon source.

Keywords:

Bacterial glucoamylase Cell engineering for bioprocess Enzyme-based fed-batch fermentation Starch to glucose conversion

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Published on: December 15, 2017

Area of Science:

Biotechnology
Synthetic Biology
Metabolic Engineering

Background:

Escherichia coli (E. coli) fermentation struggles with high cell densities due to acetate accumulation from overflow metabolism.
Traditional fed-batch systems are problematic at smaller scales.
Controlled glucose release via starch degradation is an alternative, but enzymes are typically added exogenously.

Purpose of the Study:

To engineer a self-secreting amylolytic E. coli strain for self-regulated, enzyme-based fed-batch fermentation.
To overcome limitations of traditional fed-batch cultures and exogenous enzyme addition.

Main Methods:

Cloned and expressed a glucoamylase from C. violaceum in E. coli.
Enhanced extracellular enzyme activity by modifying the signal peptide.
Introduced a glucose-sensitive promoter (PcstA) for regulated enzyme expression.
Co-expressed glucoamylase and a recombinant protein (eGFP) in a novel fermentation system.

Main Results:

Achieved significant glucose-releasing amylolytic activity from the engineered E. coli.
Created a glucoamylase-secreting strain utilizing starch as the sole carbon source.
Demonstrated increased cell densities (OD600 ~30) on starch compared to glucose (OD600 ~15).
Observed a fourfold increase in recombinant protein (eGFP) yield using the novel fed-batch system on starch.

Conclusions:

Developed a novel amylolytic E. coli strain capable of direct starch-to-glucose conversion via secreted glucoamylase.
This engineered strain achieves higher cell densities and recombinant protein yields on starch compared to glucose.
Presents a cell engineering strategy for enzyme-based fed-batch fermentation.