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A step forward to the optimized HlyA type 1 secretion system through directed evolution.

Zohreh N Pourhassan1, Haiyang Cui2,3,4, Neele Muckhoff1

  • 1Institute of Biochemistry, Heinrich Heine University, Universitätsstr. 1, 40225, Düsseldorf, Germany.

Applied Microbiology and Biotechnology
|July 5, 2023
PubMed
Summary
This summary is machine-generated.

Engineered the Type 1 Secretion System (T1SS) in E. coli for improved recombinant protein production. This enhancement achieved higher secretion titers, making E. coli a more competitive host for industrial applications.

Keywords:
Bacterial secretion systemDirected evolutionGram-negative bacteriaKnowVolutionProtein engineeringProtein secretion

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Microbial Engineering

Background:

  • Type 1 Secretion Systems (T1SS) offer advantages for recombinant protein production due to their simple architecture.
  • The hemolysin A type 1 secretion system (HlyA T1SS) from Escherichia coli is a well-studied T1SS but limited by low secretion titers.
  • Improving secretion efficiency is crucial for the commercial viability of T1SS-based protein production.

Purpose of the Study:

  • To enhance the secretion efficiency of the HlyA T1SS for biotechnological applications.
  • To engineer the HlyB and HlyD components of the HlyA T1SS inner membrane complex.
  • To increase recombinant protein yields for industrial-scale production.

Main Methods:

  • Applied the KnowVolution strategy to engineer the HlyB and HlyD proteins.
  • Introduced four specific substitutions into the HlyB protein (T36L/F216W/S290C/V421I).
  • Assessed the impact of the engineered HlyB variant on the secretion of heterologous proteins, including hydrolases, lipase, and cutinase.

Main Results:

  • Developed a novel HlyB variant with significantly improved protein secretion capabilities.
  • Achieved up to a 2.5-fold increase in secretion titers for tested hydrolases, lipase, and cutinase.
  • Demonstrated the production of nearly 400 mg/L of soluble lipase into the supernatant.

Conclusions:

  • The engineered HlyB variant represents a significant improvement for T1SS-mediated protein secretion.
  • This advancement enhances the competitiveness of E. coli as a host for recombinant protein production.
  • The study provides a valuable step towards optimizing T1SS for large-scale biotechnological applications.