Recombinant Host Cells With TyrH Variants for Higher L-DOPA Yield
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing L-DOPA, dopamine, and (S)-Norcoclaurine in recombinant host cells are limited by the efficiency of tyrosine hydroxylases, which do not achieve optimal yields of these compounds.
Innovation Solution
Introduction of heterologous L-tyrosine hydroxylases (TyrH) with improved sequences, operably linked to promoter nucleotide sequences, to enhance the production of L-DOPA, dopamine, and (S)-Norcoclaurine in recombinant microbial host cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reference L-tyrosine hydroxylase (SEQ ID NO: 58) is used in recombinant host cells, then the biosynthetic pathway can produce L-DOPA, dopamine, and (S)-Norcoclaurine, but the production yield is suboptimal and insufficient for efficient manufacturing
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the tyrosine hydroxylase enzyme through site-directed mutagenesis. Specific residues are altered to optimize catalytic activity and substrate binding, thereby increasing the conversion efficiency of L-tyrosine to L-DOPA and subsequently improving the overall production yield of dopamine and (S)-norcoclaurine in recombinant host cells
Solution Approach 2:
The patent creates improved copies of the reference tyrosine hydroxylase (SEQ ID NO: 58) by generating variant sequences with modified amino acid residues. These copied and optimized enzyme variants are then expressed in recombinant host cells to achieve superior production performance compared to the wild-type enzyme
2Ease of manufacture
If existing tyrosine hydroxylase sequences are used, then the biosynthetic pathway is functional, but the manufacturing efficiency and cost-effectiveness are limited
Solution Approach 1:
By changing the amino acid parameters of the tyrosine hydroxylase enzyme through rational design and mutagenesis, the patent optimizes catalytic efficiency and substrate affinity. This results in higher production yields of L-DOPA, dopamine, and (S)-norcoclaurine, thereby improving manufacturing efficiency and reducing production costs
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 improved tyrosine hydroxylases significantly increase the production of L-DOPA, dopamine, and (S)-Norcoclaurine, achieving yields up to 200% higher than previous methods, enabling efficient biosynthesis of these compounds.
Implementation Method 1
one or more heterologous L-tyrosine hydroxylases (TyrH) converting L-Tyrosine into L-dopa
Data Source
AI summary
The present invention relates to a recombinant microbial host cell comprising an operative biosynthetic metabolic pathway capable of producing one or more compounds selected from the group consisting of L-dopa, dopamine, (S)-Norcoclaurine and derivatives thereof; said pathway comprising a heterologous L-tyrosine hydroxylase (TyrH) converting L-Tyrosine into L-dopa capable of increasing the cell production of the Compound compared to a reference L-tyrosine hydroxylase having the sequence set forth in SEQ ID NO: 58.