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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification
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Protecting enzymatic function through directed packaging into bacterial outer membrane vesicles.

Nathan J Alves1, Kendrick B Turner2, Igor L Medintz2

  • 1National Research Council, 500 Fifth Street NW (Keck 576), Washington, DC 20001, USA.

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|April 28, 2016
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Summary
This summary is machine-generated.

Outer membrane vesicles (OMVs) protect enzymes like phosphotriesterase (PTE) from degradation. OMV-packaged PTE maintains high activity under harsh conditions, enabling long-term environmental remediation applications.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Environmental Science

Background:

  • Bacteria naturally produce outer membrane vesicles (OMVs) for cargo transport and host infection.
  • OMVs are robust proteoliposomes resistant to degradation, protecting encapsulated contents.
  • Enzymes like phosphotriesterase (PTE) are crucial for detoxification but can be unstable.

Purpose of the Study:

  • To investigate the potential of bacterial OMVs for packaging and stabilizing the enzyme phosphotriesterase (PTE).
  • To assess the activity of OMV-packaged PTE under challenging storage conditions.
  • To explore the use of OMV-packaged PTE for environmental remediation.

Main Methods:

  • Engineered bacteria to package PTE within OMVs.
  • Subjected OMV-packaged PTE and free PTE to elevated temperatures, freeze-thaw cycles, and lyophilization.
  • Assayed residual enzyme activity after stress treatments.

Main Results:

  • OMV-packaged PTE exhibited significantly enhanced stability and activity compared to free PTE.
  • Activity was over 100-fold higher after 14 days at 37°C for OMV-PTE.
  • OMV-PTE retained 3.4-fold activity after four freeze-thaw cycles and 43-fold after lyophilization.

Conclusions:

  • Bacterial OMVs can effectively package and stabilize enzymes like PTE.
  • OMV encapsulation provides superior protection against heat, freeze-thaw, and lyophilization.
  • Lyophilized OMV-packaged PTE is a promising cell-free reagent for long-term environmental remediation of contaminants.