Engineered Proline Hydroxylases for Selective Trans-3-Hydroxyproline
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Solution Overview
Problem
Existing methods for synthesizing hydroxylated proline face challenges such as limited availability of raw materials, complex chemical synthesis steps, and the need for additional purification due to multiple hydroxylated products, as well as limitations in scalability and substrate tolerance using whole cell systems.
Innovation Solution
Engineering proline hydroxylases with specific residue differences to enhance activity, substrate tolerance, stereoselectivity, and thermostability, allowing for the hydroxylation of L-proline into trans-3-hydroxyproline using alpha-ketoglutarate as a co-substrate, and conducting the process in the presence of oxygen and iron.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chemical synthesis methods are used to produce hydroxylated proline, then hydroxylated products can be obtained, but complex synthesis steps and additional purification steps are required due to formation of multiple hydroxylated products
Solution Approach 1:
The patent applies parameter changes by modifying amino acid residues at specific positions (e.g., position 117, 120, 268, 270, 343, 346) in the proline hydroxylase enzyme sequence to alter the enzyme's catalytic properties. This enables the enzyme to achieve high stereoselectivity for trans-3-hydroxyproline production, avoiding the formation of multiple hydroxylated isomers that would require complex purification steps.
Solution Approach 2:
The patent extracts and isolates a specific fungal proline hydroxylase enzyme from natural sources and engineers it for industrial application. By taking out the specific enzyme gene from the fungal organism and expressing it in a controlled system, the patent eliminates the need for complex chemical synthesis pathways and achieves direct enzymatic conversion of proline to the desired hydroxylated product.
2Productivity
If whole cell systems are used for hydroxylation, then scalability is improved, but substrate tolerance is limited
Solution Approach 1:
The patent uses an engineered proline hydroxylase enzyme as an intermediary catalyst that bridges the gap between whole cell scalability and substrate versatility. The enzyme can be expressed in whole cell systems for scalable production while its engineered properties allow it to tolerate and process a broader range of proline derivatives and analogs beyond what natural enzymes can handle.
Solution Approach 2:
The engineered proline hydroxylase exhibits enhanced universality by being able to process multiple substrate types including L-proline and various proline derivatives. The enzyme engineering at key positions expands the substrate scope while maintaining catalytic efficiency, allowing a single enzyme system to serve multiple hydroxylation needs.
3Ease of manufacture
If natural proline hydroxylases are used, then the process is simple, but activity and selectivity for trans-3-hydroxyproline are insufficient
Solution Approach 1:
The patent applies parameter changes by introducing specific amino acid substitutions at critical positions in the proline hydroxylase active site. These changes optimize the enzyme's stereoselectivity for trans-3-hydroxyproline production while maintaining the overall simplicity of the enzymatic process. The engineered enzyme retains ease of manufacture through recombinant expression while achieving superior selectivity.
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 engineered proline hydroxylases achieve higher activity and selectivity for trans-3-hydroxyproline production, overcoming scalability and substrate limitations, and reducing the need for additional purification steps.
Implementation Method 1
engineered proline hydroxylases achieve higher activity and selectivity for trans-3-hydroxyproline production
Implementation Method 2
hydroxylation of L-proline into trans-3-hydroxyproline using alpha-ketoglutarate as a co-substrate, and conducting the process in the presence of oxygen and iron
Data Source
AI summary
The present invention provides engineered proline hydroxylase polypeptides for the production of hydroxylated compounds, polynucleotides encoding the engineered proline hydroxylases, host cells capable of expressing the engineered proline hydroxylases, and methods of using the engineered proline hydroxylases to prepare compounds useful in the production of active pharmaceutical agents.