Recombinant Microorganism Hydroxytyrosol Production Pathway
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Solution Overview
Problem
Current methods for producing tyrosol and hydroxytyrosol face challenges such as high cost, low yield, and the use of expensive raw materials, along with the production of unwanted side products like L-DOPA due to enzyme HpaBC's activity on tyrosine.
Innovation Solution
A recombinant host microorganism is engineered with specific polynucleotide sequences encoding decarboxylase and hydroxylase enzymes, such as PpKDC4 and Ph3H03, to convert 4-hydroxyphenylpyruvic acid into hydroxytyrosol, bypassing the use of HpaBC and minimizing side product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If enzyme HpaBC is used to convert tyrosol to hydroxytyrosol, then hydroxytyrosol production is achieved, but unwanted side product L-DOPA is produced due to the enzyme's activity on tyrosine
Solution Approach 1:
The patent extracts and removes the problematic HpaBC enzyme from the biosynthetic pathway and replaces it with a specialized hydroxylase enzyme that specifically converts tyrosol to hydroxytyrosol without acting on tyrosine, thereby eliminating L-DOPA side product formation while maintaining hydroxytyrosol production
Solution Approach 2:
The patent introduces a hydroxylase enzyme with specific substrate specificity that acts only on tyrosol at the targeted step in the pathway, creating local enzymatic activity that produces hydroxytyrosol without the broad activity of HpaBC that causes harmful side reactions on tyrosine
2Quantity of substance
If organic synthetic methods are used to manufacture tyrosol and hydroxytyrosol, then production is achieved, but yields are low or expensive raw materials are required
Solution Approach 1:
The patent employs a biosynthetic pathway using engineered microorganisms that utilize readily available carbon sources and endogenous metabolic intermediates to self-produce hydroxytyrosol, eliminating the need for expensive organic synthetic raw materials and achieving high yields through efficient enzymatic conversions in a self-sustaining metabolic pathway
3Quantity of substance
If hydroxytyrosol is obtained by extraction from olive leaves, then natural hydroxytyrosol is obtained, but the process is costly and occupies large amounts of arable land
Solution Approach 1:
The patent replaces the mechanical extraction process from olive leaves with a biosynthetic system using genetically engineered microorganisms that produce hydroxytyrosol through metabolic pathways, substituting agricultural production with industrial biotechnology to eliminate land occupation while maintaining high yield
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 enables efficient and cost-effective production of tyrosol and hydroxytyrosol with high yields, avoiding the production of unwanted by-products like L-DOPA, thereby improving the economic viability and efficiency of the process.
Implementation Method 1
a first polynucleotide sequence encoding a decarboxylase enzyme capable of decarboxylating 4-hydroxyphenylpyruvaic acid (HPP) to produce 4-hydroxyphenylacetaldehyde
Implementation Method 2
a second polynucleotide sequence encoding a hydroxylase enzyme, wherein the hydroxylase has an amino acid sequence having at least 90% identity to the amino acid sequence as set forth in SEQ ID NO: 2
Data Source
AI summary
Provided herein is a method of producing hydroxytyrosol. The method includes: culturing a recombinant host microorganism in a medium, wherein: the host microorganism has been transformed with: a first polynucleotide sequence encoding a decarboxylase enzyme capable of decarboxylating 4 hydroxyphenylpyruvaic acid (HPP) to produce 4 hydroxyphenylacetaldehyde, and a second polynucleotide sequence encoding a hydroxylase enzyme, wherein the hydroxylase has an amino acid sequence having at least 90% identity to the amino acid sequence as set forth in SEQ ID NO: 2, and the medium comprises glucose; and collecting product hydroxytyrosol from one or both of the host microorganism and the culture medium.