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A Novel and Efficient High-Yield Method for Preparing Bacterial Ghosts.

Yi Ma1,2, Liu Cui1, Meng Wang1

  • 1School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China.

Toxins
|July 2, 2021
PubMed
Summary
This summary is machine-generated.

Researchers improved bacterial ghost (BG) production using a mutant protein E and a pLysS plasmid, achieving high lysis efficiency and yield. This novel method for producing high-quality BGs is scalable for biomedical applications.

Keywords:
bacterial ghostslysis efficiencypLysSΦX174

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Area of Science:

  • Biotechnology
  • Microbiology
  • Molecular Biology

Background:

  • Bacterial ghosts (BGs) are empty bacterial cell envelopes with potential in biomedicine.
  • Current BG production methods suffer from inefficient lysis and low yields.
  • Protein E from phage ΦX174 is a key component for bacterial lysis.

Purpose of the Study:

  • To enhance bacterial ghost production by improving lysis efficiency and yield.
  • To compare the lysis efficiency of wild-type protein E (EW) with a screened mutant protein E (EM).
  • To establish a scalable method for producing high-quality bacterial ghosts.

Main Methods:

  • Comparison of lysis efficiency of EW and EM in *Escherichia coli* BL21(DE3).
  • Implementation of the pLysS plasmid to optimize lysis and cell density (OD600 = 2.0).
  • Verification of protein expression levels via Western blot and immunofluorescence.
  • Characterization of bacterial ghost quality using Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM).
  • Construction of a T7 RNA polymerase expression system in *Salmonella enterica* for SE ghost production.

Main Results:

  • Mutant protein E (EM) demonstrated improved lysis efficiency compared to wild-type EW.
  • The pLysS plasmid enabled nearly 100% lysis efficiency at high initial cell density (OD600 = 2.0).
  • Significantly higher expression levels of EM were observed with the pLysS plasmid.
  • High-quality bacterial ghosts were successfully produced and characterized.
  • The method was successfully adapted for producing high-quality *Salmonella enterica* ghosts.

Conclusions:

  • The combination of mutant protein E and the pLysS plasmid provides a novel and efficient method for large-scale bacterial ghost production.
  • This optimized method overcomes limitations of previous BG preparation techniques.
  • The developed protocol yields high-quality bacterial ghosts suitable for applications in human and animal protection.