Recombinant E. coli Tyrosol Production via ARO10* Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current industrial production of tyrosol through chemical synthesis faces challenges in achieving high-purity and high-yield, with the highest yield reported being only 10.6 mM, making it difficult for further applications.
Innovation Solution
A recombinant Escherichia coli strain, Escherichia coli YMGR5A and YMGR6A, is constructed by deleting specific sites in the E. coli MG1655 genome and integrating the Saccharomyces cerevisiae pyruvate decarboxylase gene ARO10* at these sites, using CRISPR-cas9 technology or Red homologous recombination, to enhance tyrosol production during fermentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis is used for tyrosol production, then production capacity is achieved, but purity and yield are limited (highest yield only 10.6 mM)
Solution Approach 1:
The patent replaces chemical synthesis methods with a biological system (recombinant E. coli) to produce tyrosol. By substituting chemical reactions with enzymatic pathways in living cells, the system achieves both high yield (32.3 mM, triple the previous chemical synthesis record) and high purity, as the biological system naturally produces the target compound without the byproducts and impurities inherent in chemical synthesis processes.
2Productivity
If multiple gene integrations are performed to enhance tyrosol production, then productivity increases, but strain construction complexity increases
Solution Approach 1:
The patent divides the gene integration process into multiple independent steps, each targeting a specific genomic location (lacI, trpE, pabB, pabA, pykF sites). Each integration event is performed separately using CRISPR-Cas9 or Red homologous recombination, allowing systematic optimization of each site's contribution to tyrosol production while maintaining control over the overall strain construction process.
Solution Approach 2:
The patent optimizes tyrosol production by changing multiple parameters simultaneously: integrating the ARO10* gene at five different genomic locations, deleting specific genes (lacI, trpE, pabB, pabA, pykF, and optionally yccX) to remove metabolic bottlenecks, and adjusting fermentation conditions. This multi-parameter optimization approach enables achieving 32.3 mM yield, triple the previous record.
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
The method achieves a high-yield production of tyrosol, reaching up to 32.3 mM without the need for inducers or antibiotics, significantly surpassing previous yields and facilitating its application in food, chemical engineering, and pharmaceutical fields.
Implementation Method 1
a Saccharomyces cerevisiae pyruvate decarboxylase gene ARO10* gene is integrated at each site of the five sites to obtain Escherichia coli YMGR5A
Implementation Method 2
The above recombinant Escherichia coli is used for fermentation
Data Source
AI summary
The disclosure relates to a tyrosol-producing recombinant Escherichia coli and a construction method and application thereof and belongs to the technical field of bioengineering. The Escherichia coli undergoes heterologous expression of a codon-optimized Saccharomyces cerevisiae pyruvate decarboxylase gene ARO10*. According to the recombinant Escherichia coli, five sites of a lacI site, a trpE site, a pabB site, a pabA site and a pykF site of an Escherichia coli genome are deleted, and at the same time, the ARO10* gene is integrated at each site of the five sites to obtain a strain containing multiple copies of the ARO10* gene. On the basis of the above recombinant strain, the ARO10* gene is randomly integrated at multiple sites, and it is found that a strain with high-yield production of tyrosol can be obtained by inserting the ARO10* gene at a yccX site. Fermentation using this strain does not require inducers or antibiotics. After fermentation is carried out for 48 hours, the yield of tyrosol can reach 32.3 mM.