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Related Concept Videos

Hyperthermophilic Bacteria01:21

Hyperthermophilic Bacteria

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Domain Bacteria includes some unique hyperthermophilic species. They exhibit remarkable adaptations that enable survival in extreme environments.Thermotoga species are rod-shaped, gram-negative, non-sporulating hyperthermophiles that form a sheath-like envelope called a toga. They ferment sugars or starch, producing lactate, acetate, CO₂, and H₂, and can also grow via anaerobic respiration using H₂ and ferric iron. Found in hot springs and hydrothermal vents, over 20% of their...
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Novel T7-like expression systems used for Halomonas.

Han Zhao1, Haoqian M Zhang2, Xiangbin Chen1

  • 1Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China.

Metabolic Engineering
|November 28, 2016
PubMed
Summary

New phage-derived expression systems enable genetic engineering in non-model bacteria. These novel T7-like systems offer broad-host range functionality, crucial for advancing metabolic engineering in diverse industrial strains.

Keywords:
Expression systemMorphological engineeringNon-model microorganismPHBPart miningSynthetic biology

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Area of Science:

  • Synthetic Biology
  • Microbial Engineering
  • Molecular Biology

Background:

  • Engineering non-model organisms requires host-strain-independent genetic parts.
  • Existing biological parts often exhibit host strain sensitivity, limiting their application.
  • Development of versatile genetic tools is essential for expanding synthetic biology.

Purpose of the Study:

  • To develop novel, host-strain-independent expression systems for non-model bacteria.
  • To enable precise transcriptional control in industrially relevant microbial chassis.
  • To facilitate metabolic engineering applications in diverse bacterial species.

Main Methods:

  • Mining phage genomes to identify novel T7-like RNA polymerase-promoter pairs.
  • In vivo characterization of expression systems in Halomonas spp. TD01 and Pseudomonas entomophila.
  • Construction of engineered Halomonas TD strains for interchangeable gene expression.

Main Results:

  • Developed three orthogonal, tightly regulated, and highly efficient expression systems (MmP1, VP4, K1F).
  • Demonstrated broad-host range suitability with high correlation between E. coli and Halomonas sp. TD01.
  • Engineered Halomonas TD strains achieved significant cell elongation and high polyhydroxybutyrate (PHB) production.

Conclusions:

  • Novel phage-derived T7-like expression systems provide robust transcriptional control in non-model bacteria.
  • These systems exhibit orthogonality, tight regulation, and high efficiency, suitable for industrial applications.
  • The developed tools are expected to advance metabolic engineering efforts in various non-model organisms.