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Related Concept Videos

Inducible Operons: lac Operon01:25

Inducible Operons: lac Operon

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The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
407

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Efficient, Flexible Autoinduction Expression Systems with Broad Initiation in Bacillus subtilis.

Kuidong Xu1,2,3, Yi Tong4, Yi Li4

  • 1National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, China.

ACS Synthetic Biology
|October 26, 2021
PubMed
Summary

Researchers developed flexible bacterial autoinduction systems to improve protein production. These systems enhance expression levels and control induction timing, offering significant potential for biotechnology applications.

Keywords:
Bacillus subtilisComQXPAautoinductiondynamic featurequorum sensing

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Area of Science:

  • Microbiology
  • Synthetic Biology
  • Biotechnology

Background:

  • Bacterial protein production is hindered by low expression and poor induction control.
  • The Bacillus subtilis ComQXPA quorum sensing system typically activates the PsrfA promoter.

Purpose of the Study:

  • To engineer flexible autoinduction expression systems in Bacillus subtilis.
  • To enhance protein yield and control induction timing for recombinant protein production.

Main Methods:

  • Modified the PsrfA promoter's -35 region with conserved σA-dependent sequences to create P1.
  • Applied semi-rational design to the P1 promoter's spacer region to develop the PS1E promoter.
  • Optimized ComX and ComA promoter combinations to establish autoinduction systems with varied induction initiation times.

Main Results:

  • The P1 promoter showed an 85% increase in strength compared to PsrfA.
  • The engineered PS1E promoter exhibited an 8.22-fold higher expression level than PsrfA.
  • Developed three autoinduction systems with induction initiation ranging from 1.5 to 9.5 hours.
  • Achieved 80.2 U/mL of Bacillus deramificans pullulanase, a 36% improvement over the P566 constitutive promoter.

Conclusions:

  • Engineered flexible autoinduction expression systems in Bacillus subtilis WB600.
  • Demonstrated enhanced protein expression and controllable induction dynamics.
  • Highlighted the potential of these systems for improving protein and metabolite production in bacteria.