Mogroside Biosynthesis in Engineered Host Cells for Scalable Production
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Solution Overview
Problem
Mogrosides, which are valuable as sweeteners and possess anti-cancer, anti-oxidative, and anti-inflammatory properties, are difficult to produce efficiently due to limited enzyme characterization and labor-intensive extraction from natural sources, and chemical synthesis is hindered by structural complexity.
Innovation Solution
Engineering host cells with heterologous polynucleotides encoding cucurbitadienol synthase (CDS) enzymes, UDP-glycosyltransferase (UGT), C11 hydroxylase, cytochrome P450 reductase, and epoxide hydrolase enzymes to convert oxidosqualene into cucurbitadienol and mogrosides, optimizing enzyme sequences for enhanced production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mogrosides are extracted from natural fruit sources, then the natural composition and properties are preserved, but the extraction process becomes labor-intensive and costly
Solution Approach 1:
The patent utilizes the endogenous mevalonate pathway in yeast cells to self-produce oxidosqualene, eliminating the need for external substrate addition. The engineered yeast system serves itself by converting available carbon sources through native enzymes to generate the precursor for mogroside synthesis, thereby reducing labor-intensive intervention while maintaining natural composition fidelity
Solution Approach 2:
The patent divides the complex mogroside biosynthesis pathway into discrete enzymatic steps, each catalyzed by a specific heterologously expressed enzyme (CDS, UGT, EPH, C11H). This segmentation allows each enzyme to be independently optimized and expressed in the yeast system, improving overall production efficiency while preserving the natural structural integrity of mogrosides
2Productivity
If chemical synthesis methods are used to produce mogrosides, then production scalability is improved, but the structural complexity of mogrosides hinders de novo synthesis
Solution Approach 1:
The patent replaces complex chemical synthesis mechanisms with biological enzymatic catalysis. Instead of using multiple chemical reagents and harsh conditions to build the cucurbitane skeleton, the system employs engineered enzymes (CDS, EPH, C11H) that naturally catalyze these transformations under mild physiological conditions, dramatically simplifying the production process while enabling scalable yeast fermentation
Solution Approach 2:
The patent introduces heterologous enzymes as intermediaries to bridge the gap between simple yeast metabolism and complex mogroside structures. These enzymes act as biological mediators that facilitate stepwise transformation of oxidosqualene into mogrosides, avoiding the need for direct chemical synthesis of the complex cucurbitane core
3Loss of time
If enzyme characterization is limited, then research time and resources are reduced, but mogroside production efficiency remains suboptimal
Solution Approach 1:
The patent performs preliminary characterization of key biosynthetic enzymes (CDS, UGT, EPH, C11H) from S. grosvenorii before engineering the yeast system. By pre-identifying and validating these enzymes' activities and optimal conditions, the research team avoided time-consuming trial-and-error during production optimization, accelerating the overall development timeline while establishing a foundation for high-yield mogroside production
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
Facilitates efficient production of mogrol and mogrosides in recombinant cells, reducing production costs and overcoming yield limitations, enabling scalable synthesis of these compounds.
Implementation Method 1
host cells that comprise a heterologous polynucleotide encoding a cucurbitadienol synthase (CDS) enzyme, wherein the host cell produces a cucurbitadienol compound
Implementation Method 2
the host cell further comprises one or more heterologous polynucleotides encoding a UDP-glycosyltransferase (UGT)
Implementation Method 3
one or more heterologous polynucleotides encoding a C11 hydroxylase
Implementation Method 4
one or more heterologous polynucleotides encoding an epoxide hydrolase (EPH)
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Described in this application are enzymes (e.g., cucurbitadienol synthases (CDS), UDP- glycosyltransferases (UGT), C11 hydroxylases, epoxide hydrolases (EPH), squalene epoxidases, and/or cytochrome P450 reductases), host cells expressing the enzymes, and methods of producing mogrol precursors, mogrol, and/or mogrosides using such host cells.