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Engineering Artificial Protein Cages for Metabolic Pathway Regulation by Compartment Reinforcement.

Qiang Ding1,2,3,4,5, Xinyue Su1,2,3,4, Yongzhong Wang1,2,3,4,5

  • 1School of Life Sciences and Medical Engineering, Anhui University, Hefei 230601, China.

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Summary

Engineered protein cages compartmentalize enzymes in microbial factories. This strategy enhances the production of valuable chemicals like Lacto-N-tetraose (LNT) by improving pathway efficiency and increasing yields.

Keywords:
artificial protein cageslacto-N-tetraosemetabolic engineeringmicrobial cell factoriessynthetic biology

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Area of Science:

  • Synthetic biology
  • Metabolic engineering
  • Biotechnology

Background:

  • Microbial cell factories offer cost-effective chemical production.
  • Lack of intracellular compartmentalization limits yields due to intermediate diffusion and competing reactions.
  • Spatial organization of enzymes can improve catalytic efficiency and intermediate transfer.

Purpose of the Study:

  • To overcome limitations in microbial cell factories by enhancing spatial organization of pathway enzymes.
  • To develop a modular scaffold for enzyme colocalization using synthetic protein cages.
  • To demonstrate the effectiveness of compartmentalization in improving the biosynthesis of specific chemicals.

Main Methods:

  • Construction of a substrate channel system using a heterologous artificial protein cage scaffold.
  • Precise recruitment and colocalization of sequential enzymes via specific docking domains.
  • Application in the biosynthesis of Lacto-N-tetraose (LNT) in Escherichia coli as a model pathway.

Main Results:

  • Validated the design through precise enzyme recruitment and colocalization.
  • Demonstrated a 34.26% improvement in LNT titer by clustering enzymes within the engineered subcellular compartment.
  • Showcased enhanced pathway flux compared to non-scaffolded controls.

Conclusions:

  • Established a compartmentalized strategy for microbial chemical production.
  • Engineered enzyme colocalization within synthetic protein cages accelerates pathway flux.
  • This approach enhances the yield of target chemicals in microbial cell factories.