UGT Enzymes for Mogroside Biosynthesis Purity
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Solution Overview
Problem
The extraction of mogrosides from Siraitia grosvenorii fruit yields products of varying purity, often accompanied by an undesirable aftertaste, and is limited by low plant yields and specific cultivation requirements, necessitating the development of biotechnological processes for producing sweet mogroside compounds.
Innovation Solution
The use of isolated uridine diphospho-glucosyl transferase (UGT) polypeptides that catalyze primary and branching glucosylation of mogrol and mogroside at specific positions, enabling the biosynthesis of mogroside compounds in recombinant cells, including those with amino acid sequences at least 34% identical to SEQ ID NO: 34 and 89% identical to SEQ ID NO: 38, to produce mogroside VI and other sweet mogroside compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mogrosides are extracted from Siraitia grosvenorii fruit using traditional extraction methods, then mogroside compounds can be obtained, but the product purity is variable and accompanied by undesirable aftertaste
Solution Approach 1:
The patent extracts and isolates specific UGT enzymes from the natural biosynthetic pathway of Siraitia grosvenorii, separating the desired glucosylation function from the complex natural system. This allows selective production of pure mogroside compounds without co-extraction of impurities that cause aftertaste
Solution Approach 2:
The patent uses recombinant host cells as intermediaries to express purified UGT enzymes. These engineered cells serve as a controlled medium to produce mogrosides with high purity, avoiding the contamination issues of direct plant extraction while maintaining enzymatic specificity
2Productivity
If mogrosides are produced through traditional plant cultivation and extraction, then natural mogroside compounds can be obtained, but yields are limited due to low plant yields and particular cultivation requirements
Solution Approach 1:
The patent creates recombinant copies of the UGT enzyme genes in host cells, replicating the biosynthetic capability without requiring cultivation of the original Siraitia grosvenorii plants. This bypasses cultivation constraints and enables scalable production
Solution Approach 2:
The patent transfers the specialized mogroside-producing UGT enzymes to通用 recombinant host cells that can be cultured under standardized conditions. This makes the production system universally applicable and independent of the specific cultivation requirements of the original plant
3Manufacturing precision
If UGT enzymes are used to catalyze glucosylation reactions for mogroside biosynthesis, then high-purity sweet mogroside compounds can be produced, but multiple specific enzymes with different specificities are required
Solution Approach 1:
The patent divides the mogroside biosynthesis pathway into discrete enzymatic steps, each catalyzed by a specific UGT enzyme with defined substrate specificity. This segmentation allows precise control over which glucosylation reactions occur, enabling production of specific mogroside variants with high purity
Solution Approach 2:
The patent assigns different UGT enzymes to catalyze glucosylation at specific positions (C3, C24, C25) on the mogrol skeleton. Each enzyme has localized specificity for particular hydroxyl groups, ensuring that glucosylation occurs only at desired positions to produce the intended mogroside structure
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 allows for the production of high-purity mogroside compounds with enhanced sweetness and flavor enhancement, overcoming the limitations of traditional extraction methods by achieving efficient biosynthesis in controlled environments.
Implementation Method 1
isolated uridine diphospho-glucosyl transferase (UGT) polypeptides that catalyze primary and branching glucosylation of mogrol and mogroside at specific positions
Data Source
AI summary
Isolated mogroside and mogrol biosynthetic pathway enzyme polypeptides useful in mogroside biosynthesis are provided. Mogroside biosynthetic pathway enzymes of the invention include squalene epoxidase (SE), expoxy hydratase (EH), cytochrome p450 (Cyp), cucurbitadienol synthase (CDS) and udp-glucosyl-transferase (UGT), Also provided are methods of producing a mogroside using the isolated mogroside and mogrol biosynthetic enzyme polypeptides, the methods comprising contacting a mogrol and/or a glycosylated mogrol (mogroside) with at least one UDP glucose glucosyl transferase (UGT) enzyme polypeptide of the invention catalyzing glucosylation of the mogrol and/or the glucosylated mogrol to produce a mogroside with an additional glucosyl moietie(s), thereby producing the mogroside. Alternatively or additionally provided is a method of synthesizing a mogrol, the method comprising contacting a mogrol precursor substrate with one or more mogrol biosynthetic pathway enzyme polypeptides as described herein catalyzing mogrol synthesis from the mogrol precursor substrate, thereby synthesizing the mogrol.