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Engineering cell wall synthesis mechanism for enhanced PHB accumulation in E. coli
Xing-Chen Zhang1, Yingying Guo1, Xu Liu1
1MOE Lab for Bioinformatics, Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China.
Altering bacterial cell wall rigidity impacts poly-3-hydroxybutyrate (PHB) accumulation. Weakening cell walls in E. coli enhances PHB production, while strengthening them reduces it, offering new avenues for microbial morphology engineering.
Area of Science:
- Microbiology
- Biotechnology
- Synthetic Biology
Background:
- Bacterial cell wall synthesis dictates cell shape and mechanical properties.
- Cell wall rigidity influences intracellular content accumulation, such as poly-3-hydroxybutyrate (PHB).
Purpose of the Study:
- To investigate the relationship between bacterial cell wall rigidity and PHB accumulation.
- To explore the potential of manipulating cell wall synthesis for enhanced PHB production.
Main Methods:
- Engineered E. coli by reinforcing cell wall synthesis genes to increase rigidity.
- Weakened E. coli cell wall synthesis using CRISPR interference (CRISPRi).
- Quantified PHB accumulation in cells with altered cell wall rigidity.
Main Results:
- Reinforced cell walls increased mechanical strength (Young's modulus 1.32-1.60 folds).
- Thickened cell walls led to reduced PHB accumulation (25%).
- Weakened cell walls resulted in significantly higher PHB accumulation (93%).
Conclusions:
- Bacterial cell wall rigidity is a key factor controlling PHB accumulation.
- Targeting cell wall synthesis pathways offers a method for microbial morphology engineering.
- Weakening cell walls is a promising strategy for enhancing PHB production in E. coli.
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