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Related Experiment Videos

Accelerating whole-cell biocatalysis by reducing outer membrane permeability barrier.

Ye Ni1, Rachel R Chen

  • 1Chemical Engineering Department, Virginia Commonwealth University, 601 W. Main St., Richmond 23284-3028, USA.

Biotechnology and Bioengineering
|August 27, 2004
PubMed
Summary

Genetic engineering of bacterial outer membranes significantly boosts whole-cell biocatalysis rates by reducing permeability barriers. This molecular approach enhances enzyme efficiency for industrial applications.

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Area of Science:

  • Biotechnology
  • Biocatalysis
  • Molecular Biology

Background:

  • Whole-cell biocatalysts offer advantages but are limited by slow reaction rates due to cell envelope permeability barriers.
  • These barriers can reduce reaction efficiency by 10-100 fold compared to free enzymes.

Purpose of the Study:

  • To accelerate whole-cell biocatalysis by reducing membrane permeability barriers through molecular engineering.
  • To investigate the impact of genetic modifications on outer membrane permeability and subsequent reaction rates.

Main Methods:

  • Engineered Escherichia coli strains with altered outer membrane structures (lipopolysaccharide mutant SM101, Braun's lipoprotein mutant E609L).
  • Utilized two model substrates: nitrocefin (small, hydrophobic) and a tetrapeptide (larger, more hydrophilic).

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  • Compared the effect of genetic modifications with polymixin B nonapeptide, a known permeabilizer.

    • Main Results:

    • Genetic modifications increased whole-cell biocatalysis reaction rates by up to 380%.
    • The extent of rate enhancement varied depending on substrate properties and the specific outer membrane mutations.
    • Demonstrated that membrane engineering can be more effective than exogenous permeabilizers in overcoming substrate limitations.

    Conclusions:

    • Genetic modification of bacterial outer membranes is a viable strategy to enhance biocatalysis efficiency.
    • Targeting the Lipid A region is suggested for enhancing hydrophilic molecule permeability, but alternative strategies are also effective.
    • This study pioneers molecular membrane engineering to overcome substrate permeability limitations in biocatalysis.