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Characterization of Highly Ferulate-Tolerant Acinetobacter baylyi ADP1 Isolates by a Rapid Reverse Engineering Method
Jin Luo1, Emily A McIntyre2, Stacy R Bedore2
1Faculty of Engineering and Natural Sciences, Hervanta Campus, Tampere University, Tampere, Finland.
Applied and Environmental Microbiology
|November 17, 2021
Summary
Researchers developed a new method, rapid advantageous mutation screening and selection (RAMSES), to quickly identify beneficial mutations in microbial strains. This technique speeds up the process of improving microbial hosts for industrial applications like lignin valorization.
Area of Science:
- Microbial biotechnology and synthetic biology
- Genomics and molecular evolution
- Metabolic engineering and bioprocess development
Background:
- Adaptive laboratory evolution (ALE) improves microbial phenotypes but identifying specific beneficial mutations is challenging.
- Lignin-derived aromatic compounds are toxic, hindering microbial valorization despite ALE's potential.
- Acinetobacter baylyi ADP1 is a promising strain for biotechnology due to its natural competence and recombination efficiency.
Purpose of the Study:
- To develop a novel, rapid method for identifying significant mutations in evolved microbial strains.
- To analyze mutations conferring tolerance to high levels of ferulate, a lignin-derived aromatic compound.
- To demonstrate the utility of Acinetobacter baylyi ADP1 as a platform for strain development.
Main Methods:
- Whole-genome sequencing of evolved Acinetobacter baylyi ADP1 strains.
- Development and application of rapid advantageous mutation screening and selection (RAMSES) for identifying beneficial mutations.
- Introduction of identified beneficial mutations into new strains via natural transformation and homologous recombination.
Main Results:
- RAMSES enabled rapid determination and introduction of advantageous mutations.
- Key mutations were identified in genes involved in aromatic transport (hcaE, hcaK, vanK) and lipopolysaccharide synthesis (ACIAD0482).
- Enhanced tolerance to aromatic compounds was achieved, facilitating improved substrate utilization.
Conclusions:
- RAMSES is an effective approach for reverse engineering beneficial mutations in Acinetobacter baylyi ADP1.
- The study clarifies genetic mechanisms for enhanced tolerance to lignin-derived aromatics.
- This work facilitates metabolic engineering for lignin valorization and strain development.
