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Advancing Bacillus licheniformis as a Superior Expression Platform through Promoter Engineering.

Fengxu Xiao1,2,3,4, Yupeng Zhang1,2,3,4, Lihuan Zhang1,2,3

  • 1Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.

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Bacillus licheniformis promoters are key for biomanufacturing. This review covers engineered promoters for enhanced protein and chemical synthesis, expanding the toolbox for B. licheniformis cell factories.

Keywords:
Bacillus licheniformispromoterpromoter engineering

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Area of Science:

  • * Synthetic biology and metabolic engineering
  • * Microbial biotechnology and bioprocess engineering

Background:

  • * Bacillus licheniformis is a robust host for producing high-value products in biomanufacturing.
  • * Efficiently engineered B. licheniformis cell factories require precisely regulated gene expression.
  • * Promoters are critical genetic elements controlling gene expression in B. licheniformis.

Purpose of the Study:

  • * To review recent advancements in the characterization, synthesis, and engineering of B. licheniformis promoters.
  • * To highlight the application of various promoter types in B. licheniformis for biomanufacturing.
  • * To summarize strategies for expanding the B. licheniformis promoter toolbox.

Main Methods:

  • * Literature review of recent research on B. licheniformis promoter engineering.
  • * Analysis of promoter characterization, synthesis, and engineering techniques.
  • * Categorization of promoters based on their regulatory mechanisms (constitutive, quorum sensing, inducible).

Main Results:

  • * Established constitutive, quorum sensing, and inducible promoters are applied in protein and chemical synthesis.
  • * Novel engineering approaches are expanding the repertoire of B. licheniformis promoters.
  • * Hybrid promoter engineering and transcription factor-based systems offer new regulatory possibilities.

Conclusions:

  • * Advancements in B. licheniformis promoter engineering are crucial for optimizing biomanufacturing applications.
  • * A diverse and well-characterized promoter set enhances the utility of B. licheniformis as a cell factory.
  • * Continued engineering efforts, including RBS optimization, will further improve B. licheniformis-based bioproduction.