Actinomycete Metabolic Engineering Using Reporter-Guided Single-Cell Sorting
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Solution Overview
Problem
Current methods for metabolic engineering of Actinomycetes rely on random mutagenesis and plate-based screening, which fail to predict industrial performance and require laborious optimization, leading to inefficient production of secondary metabolites and proteins.
Innovation Solution
A method combining reporter-guided single cell technologies with traditional mutagenesis, using a dual reporter system for antibiotic resistance and fluorescent protein to enrich and screen mutants in liquid culture, enabling fluorescent cell sorting and mycelial fragmentation for high-throughput selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random mutagenesis and plate-based screening are used, then mutant libraries can be generated, but the throughput is limited and the screening conditions do not reflect industrial bioreactor performance
Solution Approach 1:
The patent replaces mechanical plate-based screening with fluorescent cell sorting (FACS), an optical/electronic system that automatically sorts cells based on fluorescence intensity. This substitution enables high-throughput screening of millions of mutants while maintaining screening conditions that match industrial bioreactor environments, thereby resolving the contradiction between throughput and reliability.
Solution Approach 2:
The patent changes the detection parameter from visual plate inspection to quantitative fluorescence measurement. By using fluorescent reporters and FACS, the system can rapidly quantify and sort mutants based on precise fluorescence intensity thresholds, enabling both high throughput and reliable prediction of industrial performance through parameters that directly correlate with bioreactor productivity.
2Measurement precision
If individual cultivation of each mutant strain is performed to assess production profiles, then production yields can be evaluated, but the process becomes laborious and time-consuming
Solution Approach 1:
The patent replaces manual individual cultivation and assessment with automated fluorescent cell sorting. The FACS system rapidly evaluates millions of mutants in liquid culture based on fluorescence intensity, providing precise production profile assessment without the time-consuming manual handling of individual strains, thus resolving the contradiction between measurement precision and time loss.
Solution Approach 2:
The patent enables continuous evaluation of mutants in liquid culture through automated FACS sorting, eliminating the discontinuous manual processing steps of traditional methods. The system continuously sorts and identifies high-producing mutants based on real-time fluorescence measurements, maintaining both precision and speed.
3Productivity
If medium optimization is performed through multi-parameter modification, then high yield production can be achieved, but the process becomes complex and time-consuming
Solution Approach 1:
The patent replaces complex manual medium optimization with automated fluorescent screening and sorting. The system objectively identifies high-producing mutants through fluorescence intensity measurements, eliminating the need for complex multi-parameter medium optimization experiments and reducing process complexity while maintaining or improving productivity.
4Measurement precision
If plate-based screening methods are used, then mutant identification is possible, but the throughput is limited and does not enable high-throughput selection
Solution Approach 1:
The patent replaces plate-based visual screening with automated fluorescent cell sorting. The FACS system uses optical detection to rapidly measure and sort millions of cells based on fluorescence intensity, achieving both precise mutant identification and high throughput simultaneously, thereby resolving the contradiction between measurement precision and productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly enhances the efficiency of metabolic engineering, allowing for the identification of top-producing strains by orders of magnitude, up to 9-fold yield improvement in secondary metabolites like mutaxanthenes and 25-fold in proteins like cholesterol oxidase, while activating silent biosynthetic gene clusters.
Implementation Method 1
adding an antibiotic corresponding to the antibiotic resistance gene to the liquid culture to induce selective pressure to enrich mutants
Implementation Method 2
a second reporter gene encoding a fluorescent protein... screening the mutant library with fragmented mycelia by fluorescent cell sorting to obtain a metabolically engineered Actinomycetes strain that provides a fluorescent signal, wherein the extent of the fluorescent signal correlates with the expression level of the target gene
Data Source
AI summary
The invention relates to a method for metabolic engineering of Actinomycetes. The method is based on traditional mutagenesis combined with reporter-guided single cell technologies. The method may be used for various purposes, such as for producing or increasing yields of endogenous target proteins or secondary metabolites, for replacing medium optimization in the production of target proteins or secondary metabolites, and for activating silent target genes or silent biosynthetic gene cluster. Also provided are metabolically engineered Actinomycetes strains obtainable by the method.