Engineered Yeast Salidroside Production with U8GT3 and TYDC
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Solution Overview
Problem
The production of salidroside is limited by low content in the Rhodiola rosea plant, complex extraction processes, and high costs, and current chemical synthesis methods are not suitable for industrialization, while microbial cell factories face challenges in precursor metabolic flux improvement.
Innovation Solution
The use of glucosyltransferase U8GT3 and poppy-derived tyrosine decarboxylase mutants, combined with metabolic pathway optimizations, decouples cell growth and product synthesis in yeast, creating a new precursor pathway for salidroside production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If extraction from Rhodiola rosea plant is used, then salidroside can be obtained, but the content is low (0.5%-0.8%), extraction process is complicated, and time and labor costs are high
Solution Approach 1:
The patent replaces the mechanical extraction process from Rhodiola rosea plants with a biological synthesis system using engineered yeast. The yeast cell factory converts glucose directly into salidroside through heterologously expressed genes (U8GT3, TYDC, ARO10, TYR1), eliminating the need for plant extraction and significantly improving both salidroside content and production efficiency.
Solution Approach 2:
The engineered yeast strain performs self-service by autonomously converting glucose to salidroside through the introduced metabolic pathway. The yeast cells themselves become the production system, eliminating the need for separate extraction processes and reducing labor costs while increasing productivity.
2Quantity of substance
If chemical synthesis method is used, then salidroside can be produced, but the preparation process is complicated and industrialization is difficult
Solution Approach 1:
The patent replaces complex chemical synthesis processes with a biological catalysis system. Four enzymes (U8GT3, TYDC, ARO10, TYR1) expressed in yeast cells catalyze the conversion of glucose to salidroside through a streamlined pathway, dramatically simplifying the preparation process and enabling easy industrialization through fermentation.
3Productivity
If metabolic pathway optimization is performed in yeast, then salidroside production can be improved, but the metabolic flux of precursor needs further improvement for industrial production
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: introduces four key genes (U8GT3, TYDC, ARO10, TYR1) to establish a complete pathway, uses galactose-inducible promoters (GAL1, GAL10) to control gene expression, and performs codon optimization for yeast expression. These parameter changes collectively enhance both production efficiency and precursor metabolic flux.
Solution Approach 2:
The patent performs preliminary optimization of the metabolic pathway before industrial scaling. The complete pathway including precursor synthesis (through ARO10 and TYR1) and salidroside formation (through U8GT3 and TYDC) is pre-established and optimized in the yeast strain, ensuring high precursor flux is ready for industrial production.
4Productivity
If cell growth and product synthesis are coupled in engineered yeast, then metabolic pressure on the engineered bacteria increases, but decoupling requires additional genetic modifications
Solution Approach 1:
The patent uses periodic induction with galactose to separate cell growth phase from product synthesis phase. During the growth phase on glucose, the GAL1 and GAL10 promoters are inactive, allowing cells to multiply without metabolic burden. When galactose is added, the promoters are activated, inducing high-level expression of the salidroside pathway genes and shifting metabolism to product synthesis.
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 enhances salidroside production efficiency, reduces metabolic pressure, and allows for cost-effective, climate-independent fermentation, suitable for industrial applications in medicine and cosmetics.
Implementation Method 1
glucosyltransferase U8GT3...in improving the yield of salidroside synthesized by using yeast
Implementation Method 2
poppy-derived tyrosine decarboxylase and/or tyrosine decarboxylase mutants in improving the yield of tyrosol synthesized by using yeast
Implementation Method 3
a method for producing salidroside and/or tyrosol by using yeast
Data Source
Figure 1~2
AI summary
Provided is an application of glucosyltransferase U8GT3 and/or poppy-derived tyrosine decarboxylase or a mutant thereof in the yeast synthesis of salidroside; further provided is an application of poppy-derived tyrosine decarboxylase or a mutant thereof in the yeast synthesis of tyrosol. The amino acid sequences of the poppy-derived tyrosine decarboxylase and the mutant thereof are respectively shown in SEQ ID NOs: 7-8, and the nucleotide sequences of the coding genes are respectively shown in SEQ ID NOs: 1-2; the amino acid sequence of the glucosyltransferase U8GT3 is shown in SEQ ID NO: 10, and the nucleotide sequence of the coding gene is shown in SEQ ID NO: 4.