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Bacterial Translocation and Protein Secretion01:26

Bacterial Translocation and Protein Secretion

Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
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Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...
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Generic Protocol for Optimization of Heterologous Protein Production Using Automated Microbioreactor Technology
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Published on: December 15, 2017

Optimization of protein secretion by Bacillus subtilis.

Reindert Nijland1, Oscar P Kuipers

  • 1Molecular Genetics Group, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands.

Recent Patents on Biotechnology
|December 17, 2008
PubMed
Summary

Bacillus subtilis is a key bacterium for producing industrial proteins. Recent patents focus on optimizing its protein secretion through genetic modifications and gene expression.

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Area of Science:

  • Microbiology
  • Biotechnology
  • Industrial enzyme production

Background:

  • Bacillus subtilis is a Gram-positive bacterium renowned for high-level production and secretion of industrially significant proteins, particularly enzymes.
  • Its GRAS (Generally Recognized As Safe) status and cost-effective, high-cell-density cultivation make it advantageous for bioprocessing.
  • Numerous patents have been filed to enhance protein production and secretion in B. subtilis.

Purpose of the Study:

  • To provide an overview of current literature and patents related to optimizing protein overexpression and secretion in Bacillus subtilis.
  • To discuss recent patented strategies for improving heterologous protein secretion.
  • To highlight specific patented modifications, such as SecA alterations and yusZ/yusX gene expression reduction.

Main Methods:

  • Literature and patent review focusing on Bacillus subtilis protein secretion.
  • Analysis of patented genetic and molecular modifications for enhanced protein production.
  • Discussion of specific patented examples, including SecA modification and regulation of yusZ/yusX genes.

Main Results:

  • Patents cover various stages of protein production and secretion, including promoter optimization and protease deletion.
  • Recent patents demonstrate successful optimization through modifications like altered SecA function.
  • Reduced expression of yusZ and/or yusX genes shows a positive impact on heterologous protein secretion.

Conclusions:

  • Continuous improvements in Bacillus subtilis protein secretion are being patented.
  • Optimization strategies are often protein-specific, requiring tailored approaches.
  • Genetic engineering and regulatory control of specific genes offer promising avenues for enhanced industrial protein production.