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Systems-level analysis predicts no autotrophy-linked protein-RNA interactions in Clostridium autoethanogenum.

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Reverse-Engineered Gas-Fermenting Acetogen Strains Recover Enhanced Phenotypes From Autotrophic Adaptive Laboratory

Henri Ingelman1, Kurshedaktar Majibullah Shaikh1, Kaspar Valgepea1

  • 1Institute of Bioengineering, University of Tartu, Tartu, Estonia.

Microbial Biotechnology
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Summary

Researchers engineered Clostridium autoethanogenum strains by deleting specific genes, enhancing their ability to convert gases into valuable products for a circular economy. These modified acetogens show faster growth and improved industrial performance.

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biochemicalsbiofuelschemostatgas fermentationmetabolomicsproteomicsreverse genetic engineering

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Area of Science:

  • Microbial biotechnology
  • Synthetic biology
  • Circular economy

Background:

  • Gas-fermenting acetogens are key for converting CO and CO2 into fuels and chemicals.
  • Understanding gene function in acetogens is crucial for developing efficient cell factories.
  • Adaptive laboratory evolution (ALE) identified potential gene targets for improved autotrophic growth.

Purpose of the Study:

  • To genetically engineer and characterize Clostridium autoethanogenum strains with enhanced autotrophic phenotypes.
  • To validate the role of specific genes identified through ALE in improving industrial traits.
  • To gain insights into genotype-phenotype relationships in acetogens for metabolic engineering.

Main Methods:

  • Reverse engineering of three specific gene deletion/mutation targets (CLAU_0471, CLAU_3129, CLAU_1957) in C. autoethanogenum.
  • Extensive characterization of autotrophic growth in batch and continuous bioreactor cultures.
  • Proteome expression analysis and bioinformatic analysis of engineered strains.

Main Results:

  • Reverse-engineered strains RE1, RE2, and RE3 recovered superior phenotypes from ALE isolates, including faster growth and robustness.
  • Strain RE3 showed increased 2,3-butanediol production, while RE1 matched the performance of a leading ALE isolate.
  • Targeted genes appear to be involved in overlapping regulatory networks, influencing key metabolic traits.

Conclusions:

  • Targeted genetic modification of acetogens can effectively restore and enhance industrially desirable phenotypes.
  • Understanding gene function and regulatory networks is vital for optimizing acetogen cell factories.
  • This study provides valuable genotype-phenotype insights for advancing gas fermentation technology.