Ergothioneine Production via OvoA Enzymatic Coupling
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Solution Overview
Problem
Current methods for producing ergothioneine through fermentation face challenges such as low EgtB activity, inability to overexpress EgtE, and competition with glutathione biosynthesis due to the ergothioneine biosynthetic pathway's inefficiencies.
Innovation Solution
Development of a novel enzymatic method and metabolic engineering approach that includes successful production of EgtE, improved EgtB activity, and utilization of OvoA or NcEgt1 enzymes to catalyze direct oxidative coupling of cysteine and trimethyl-histidine, reducing the pathway by two steps and eliminating competition with glutathione synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the currently known ergothioneine biosynthetic pathway is used for fermentation production, then ergothioneine can be produced through five enzymatic steps, but the production yield is limited due to low EgtB activity, inability to overexpress EgtE, and competition with glutathione biosynthesis
Solution Approach 1:
The patent divides the traditional five-step ergothioneine biosynthetic pathway into two separate pathways: (1) a simplified two-step pathway using OvoA or NcEgt1 for direct oxidative coupling of hercynine and cysteine, and (2) the remaining steps using EgtE and other enzymes. This segmentation eliminates the problematic EgtB step and reduces competition with glutathione synthesis, thereby improving production yield while managing pathway complexity.
Solution Approach 2:
The patent extracts and removes the EgtB enzyme step from the traditional biosynthetic pathway. By eliminating this low-activity enzyme that causes bottlenecks and competition with glutathione biosynthesis, the pathway is simplified to use alternative enzymes (OvoA or NcEgt1) that do not interfere with glutathione production, thus resolving the productivity limitation.
2Productivity
If chemical approaches are used for ergothioneine production, then production can bypass biosynthetic limitations, but the method lacks the efficiency and sustainability of biological production
Solution Approach 1:
The patent changes the biochemical parameters of the production system by introducing engineered microbial strains with modified metabolic pathways. Instead of using chemical synthesis, the patent optimizes biological parameters such as enzyme expression levels, pathway flux, and substrate availability to achieve efficient ergothioneine production through fermentation, combining the efficiency of chemical methods with the sustainability of biological systems.
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
Enhances ergothioneine production levels in both cell-free enzymatic systems and fermentation processes, achieving higher yields and simplifying the biosynthetic pathway.
Implementation Method 1
An enzyme from the ovothiol biosynthetic pathway (OvoA) can be used to catalyze the direct oxidative coupling of Cys and trimethyl-histidine to produce a key intermediate needed in the biosynthesis of ergothioneine
Implementation Method 2
Another enzyme NcEgt1 was also able to catalyze the direct coupling between Cys and trimethyl-histidine
Implementation Method 3
Ergothioneine is produced from two amino acids (histidine and cysteine) through five-enzymatic steps
Data Source
AI summary
The present disclosure relates to the production of ergothioneine through either in vitro enzymatic transformations or fermentations using microbials created by metabolic engineering. Also disclosed are transformed cells useful in such methods and ergothioneine produced by such methods. Transformed cells of the disclosure are capable of converting histidine and cysteine or hercynine and cysteine into ergothioneine in greater efficiency than the untransformed wild-type cells.