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Rapid Assembly of Multi-Gene Constructs using Modular Golden Gate Cloning
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Multigene Pathway Engineering with Regulatory Linkers (M-PERL).

Duo Liu1,2, Hong Liu1,2, Bing-Zhi Li1,2

  • 1Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University , Tianjin, 300072, P. R. China.

ACS Synthetic Biology
|July 9, 2016
PubMed
Summary

This study introduces a new method for engineering multigene pathways in yeast by tuning promoter strengths. The M-PERL strategy efficiently assembles and regulates genes, optimizing product synthesis.

Keywords:
DNA assemblymultigene pathway engineeringregulatory linkerregulatory regionyeast promoter

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Area of Science:

  • Synthetic biology
  • Metabolic engineering
  • Molecular biology

Background:

  • Multigene pathway engineering requires extensive libraries for transcriptional/translational regulation and mutant enzymes.
  • Optimizing part combinations is crucial for achieving desired pathway functions.

Purpose of the Study:

  • To develop a novel strategy, M-PERL (Multigene Pathway Engineering with Regulatory Linkers), for efficient multigene pathway assembly and regulation.
  • To investigate the impact of regulatory linker modifications on yeast promoter strength and gene expression.
  • To demonstrate the application of M-PERL in tuning the violacein synthesis pathway for optimized product profiles.

Main Methods:

  • Developed regulatory linkers with homologous ends for gene assembly and a central region for promoter tuning.
  • Investigated the effect of homologous end length on multigene assembly.
  • Analyzed modifications to the transcriptional start site (TSS) and adjacent regions of yeast promoters.
  • Introduced random base insertions (N) in the central linker region to modulate promoter strength.
  • Applied M-PERL to assemble and regulate five genes in the violacein synthesis pathway.

Main Results:

  • Demonstrated that regulatory linker modifications, including TSS alterations and random base insertions, effectively tune yeast promoter strengths.
  • Successfully assembled and regulated a five-gene pathway (violacein synthesis) using distinct libraries of regulatory linkers.
  • Observed significant effects of gene expression tuning on violacein product profiles, leading to enhanced single component synthesis and varied composition.

Conclusions:

  • M-PERL provides an efficient and versatile tool for assembling and regulating complex multigene pathways in synthetic biology.
  • The strategy allows for precise control over gene expression, enabling optimization of metabolic pathways and tailored production of target compounds.
  • This approach facilitates the engineering of microbial cell factories for improved biosynthesis of valuable molecules.