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Related Experiment Video

Updated: Feb 22, 2026

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Controlling cell volume for efficient PHB production by Halomonas.

Xiao-Ran Jiang1, Zhi-Hao Yao1, Guo-Qiang Chen2

  • 1MOE Key Lab of Bioinformatics, School of Life Sciences, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China.

Metabolic Engineering
|September 18, 2017
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Summary
This summary is machine-generated.

Manipulating bacterial cell shape using a temperature-controlled system enhances polyhydroxybutyrate (PHB) production. This method allows for increased cell size, leading to higher yields and easier product separation.

Keywords:
Cell sizeHalomonasMorphology engineeringOpen fermentationPHBmreB

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Area of Science:

  • Microbiology
  • Biotechnology
  • Synthetic Biology

Background:

  • Bacterial morphology is crucial for cell function and is regulated by cytoskeleton proteins MreB and FtsZ.
  • Disrupting mreB or ftsZ genes in *H. campaniensis* LS21 affects cell size and growth, impacting polyhydroxybutyrate (PHB) accumulation.

Purpose of the Study:

  • To develop a controllable system for manipulating bacterial morphology to enhance PHB production.
  • To investigate the relationship between cell size/shape and PHB yield in *H. campaniensis* LS21.

Main Methods:

  • Engineered a temperature-responsive plasmid expression system for *H. campaniensis* LS21.
  • Utilized the system to control the expression of mreB and ftsZ genes, manipulating cell morphology.
  • Implemented a two-temperature cultivation strategy (30°C for growth, 37°C for morphology expansion).

Main Results:

  • Achieved normal growth at 30°C with compensated gene expression, reaching sufficient cell density.
  • Induced significant cell size expansion (width or length) at 37°C due to plasmid loss.
  • Observed an 80% increase in polyhydroxybutyrate (PHB) yield through controlled morphology manipulation.

Conclusions:

  • Controllable expansion of bacterial cell volume provides greater intracellular space for PHB accumulation.
  • The resulting changes in cell gravity facilitate improved downstream separation of cells and product.
  • This approach offers a novel strategy for enhancing biopolymer production through morphological engineering.