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Author Spotlight: The Production of Recombinant Proteins
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Holin-assisted bacterial recombinant protein export.

Tingting Guo1, Yue Cui1, Lingwen Zhang1

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Biotechnology and Bioengineering
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Summary
This summary is machine-generated.

Phage-encoded holin facilitates extracellular protein export in engineered bacteria. This method enhances protein yields in Escherichia coli and Lactococcus lactis, offering a novel approach for producing valuable proteins.

Keywords:
HolinSRP pathwaymembrane poreprotein export

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Area of Science:

  • Microbiology
  • Biotechnology
  • Molecular Biology

Background:

  • Enhancing extracellular protein yields in engineered bacteria is crucial for industrial applications.
  • Current methods for protein export lack a simple, generic approach.

Purpose of the Study:

  • To investigate the potential of phage-encoded holin for extracellular protein export in bacteria.
  • To evaluate holin's efficacy in both Gram-negative (Escherichia coli) and Gram-positive (Lactococcus lactis) bacteria.

Main Methods:

  • Recombinant expression of holin gene LLNZ_RS10380 (hol380) in E. coli and L. lactis.
  • Analysis of protein export using beta-galactosidase, staphylococcal nuclease, and fimbrial adhesin FaeG.
  • Proteomics and transcriptional level analysis to understand the underlying mechanisms.

Main Results:

  • Hol380 formed pores in the cytoplasmic membrane of E. coli, enabling export of cytosolic beta-galactosidase.
  • In L. lactis, Hol380 enhanced the secretion of staphylococcal nuclease and FaeG, but did not export cytosolic proteins.
  • Hol380 overexpression in L. lactis led to increased accumulation of Ffh and YidC, suggesting involvement in the signal recognition particle pathway.

Conclusions:

  • Phage-encoded holin is a viable tool for enhancing extracellular protein production in engineered bacteria.
  • Hol380 demonstrates differential effects in Gram-negative and Gram-positive bacteria, highlighting species-specific mechanisms.
  • This study presents a novel strategy for bacterial cell factories to export target proteins of economic or medical importance.