Minimal Genome Microorganism Adapted to Minimal Medium
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Solution Overview
Problem
Existing minimal genome microorganisms exhibit reduced growth rates when grown in minimal medium without nutrient supplementation, limiting their industrial applicability and understanding of bacterial genome processes such as synthetic lethality and cellular interactions.
Innovation Solution
A novel microorganism with a smaller genome size than wild-type E. coli, developed through adaptive laboratory evolution in LB broth with stepwise decreasing concentrations, maintains high growth efficiency and pyruvate production capacity, and exhibits improved protein translational efficiency, allowing it to thrive in minimal medium without nutrient supplementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sequential genome reduction is performed in rich media, then genome size is reduced, but growth rate is reduced when grown in minimal medium
Solution Approach 1:
The invention changes the parameter of growth medium composition from rich media to minimal media during the genome reduction process. This parameter change allows the microorganism to adapt to minimal medium conditions while undergoing sequential deletion of non-essential genes, thereby maintaining growth capability in minimal medium after genome reduction is complete.
Solution Approach 2:
The invention performs preliminary adaptation of the microorganism to minimal medium conditions before conducting sequential genome reduction. This preliminary action prepares the cellular machinery and metabolic pathways to function efficiently in minimal medium, preventing growth rate reduction that would otherwise occur when genome-reduced strains are transferred to minimal medium.
2Quantity of substance
If non-essential genes are deleted to create minimal genome, then genome size is reduced, but understanding of bacterial genome processes is limited
Solution Approach 1:
The invention uses an intermediary organism (E. coli) with a well-characterized genome as the starting point for minimal genome creation. The extensive existing knowledge about E. coli genome processes serves as an intermediary reference framework, allowing researchers to understand genome reduction effects by comparing against the known wild-type processes while still achieving significant genome size reduction.
3Quantity of substance
If genome-reduced strain is developed for industrial application, then genome size is reduced, but growth rate reduction limits industrial availability
Solution Approach 1:
The invention changes multiple parameters simultaneously: growth medium composition (from rich to minimal), deletion strategy (systematic removal of non-essential genes), and selection conditions (growth in minimal medium). These coordinated parameter changes result in a genome-reduced strain that maintains high growth rates in minimal medium, making it suitable for industrial applications where cost-effective, scalable production is required.
Solution Approach 2:
The invention extracts and removes non-essential genes from the E. coli genome through systematic deletion. By taking out these redundant genetic elements while maintaining essential functions, the resulting minimal genome strain achieves both reduced genome size and maintained industrial applicability, as demonstrated by its high growth rate and pyruvate production capacity.
Data Source
AI summary
Provided is a method of producing a novel microorganism having a minimal genome. In particular, provided are a method of producing a novel microorganism having a smaller genome size than a wild-type, the method including the step of culturing the microorganism in a medium containing LB broth with stepwise decreasing concentrations of the LB broth; and a novel microorganism having a smaller genome size than a wild-type, produced by the above method.Despite the small genome size, the novel microorganism of the present disclosure may have a high growth rate, pyruvate production capacity, and protein translation efficiency thereby being usefully applied to industry such as production of recombinant proteins or pyruvate.