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Related Experiment Videos

A single point mutation within the coding sequence of cholera toxin B subunit will increase its expression yield.

Bita Bakhshi1, Mina Boustanshenas2, Masoud Ghorbani3

  • 1Dept. of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.

Iranian Biomedical Journal
|May 21, 2014
PubMed
Summary

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A point mutation in the cholera toxin B subunit (CTB) gene significantly increased recombinant CTB (rCTB) expression in E. coli. This enhanced solubility and high-yield production of rCTB offers a promising system for its development.

Area of Science:

  • Recombinant protein expression
  • Molecular biology
  • Biotechnology

Background:

  • Cholera toxin B subunit (CTB) is a key immunogen and adjuvant.
  • Current expression yields for recombinant CTB (rCTB) are often insufficient.
  • Optimization of rCTB expression is crucial for its applications.

Purpose of the Study:

  • To compare the expression levels of native and mutant recombinant CTB (rCTB).
  • To investigate the impact of a specific point mutation on rCTB yield.
  • To evaluate the suitability of the pQE vector system for high-yield rCTB production.

Main Methods:

  • PCR amplification and cloning of native and mutant ctxB genes.
  • Subcloning into the pQE-30 expression vector.
  • Transformation into E. coli M15 (pREP4) for protein expression and analysis via SDS-PAGE and Western blot.

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Main Results:

  • Maximum rCTB expression was observed 5 hours post-induction.
  • Mutant rCTB exhibited significantly higher expression levels compared to native rCTB.
  • The mutant rCTB maintained pentameric stability and antigen-binding capability.

Conclusions:

  • A point mutation (S128T) in the ctxB gene leads to over-expression of rCTB.
  • Increased solubility of the mutant rCTB is likely responsible for the enhanced yield.
  • This optimized expression system enables high-yield production of rCTB.