Cis-Polyisoprenoid Synthesis Using Neryl Diphosphate Synthase
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Solution Overview
Problem
Current methods are unable to synthesize polyisoprenoids with a 100% cis-configuration, and existing synthetic rubbers face challenges in controlling polymerization to achieve a complete cis-configuration, leading to the incorporation of trans-bonds.
Innovation Solution
A method involving binding a neryl diphosphate synthase protein expressed from a specific gene to rubber particles in vitro, utilizing a mutant form with a modified helix 3 region to enable the synthesis of 100% cis-polyisoprenoids, and introducing a vector with a promoter for laticifer-specific gene expression to enhance production in transgenic plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If neryl diphosphate synthase is used to synthesize polyisoprenoid, then cis-configuration is achieved, but molecular weight is limited to 10,000 or smaller
Solution Approach 1:
The patent combines neryl diphosphate synthase (which provides 100% cis-configuration) with cis-prenyltransferase (which enables high molecular weight synthesis) in a hybrid enzyme system. This merging allows the synthesis of high molecular weight polyisoprenoids while maintaining complete cis-configuration, resolving the contradiction between precision and quantity.
Solution Approach 2:
The patent modifies the neryl diphosphate synthase by replacing its helix 3 region with that of cis-prenyltransferase. This parameter change in the enzyme structure enables it to synthesize high molecular weight polyisoprenoids while retaining the cis-configuration capability, thus overcoming the molecular weight limitation.
2Productivity
If natural rubber is synthesized in plants, then polyisoprenoid production is achieved, but trans-bonds are incorporated
Solution Approach 1:
The patent extracts and utilizes only the essential catalytic domain of neryl diphosphate synthase responsible for cis-configuration, while excluding the chain length limitation. By expressing this enzyme in plant systems (specifically in laticifers via promoter-driven expression), it achieves high productivity while maintaining 100% cis-configuration without trans-bonds.
3Quantity of substance
If cis-prenyltransferase is used to synthesize high molecular weight polyisoprenoid, then molecular weight is increased, but complete cis-configuration is not achieved
Solution Approach 1:
The patent creates a functional merger where the modified neryl diphosphate synthase (with helix 3 from cis-prenyltransferase) combines the advantages of both enzymes: the cis-configuration capability of neryl diphosphate synthase and the high molecular weight synthesis capability of cis-prenyltransferase.
Solution Approach 2:
By changing the helix 3 region parameter of neryl diphosphate synthase to match that of cis-prenyltransferase, the enzyme gains the ability to synthesize high molecular weight polyisoprenoids while maintaining the cis-configuration property, thus resolving the contradiction between quantity and precision.
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 efficient production of polyisoprenoids with unprecedented structures, including 100% cis-polyisoprenoids, and enhances cis-isoprenoid production in plants, facilitating the creation of environmentally friendly rubber products and tires.
Implementation Method 1
neryl diphosphate synthase is known to bind dimethylallyl diphosphate (DMAPP) and isopentenyl diphosphate (IPP) in a cis configuration
Data Source
AI summary
The present disclosure provides a method for producing a polyisoprenoid, which makes it possible to synthesize in vitro a polyisoprenoid having an unprecedented structure, such as a 100% cis-polyisoprenoid or a polyisoprenoid containing an allylic diphosphate derivative as an initiating terminal. The present disclosure relates to a method for producing a polyisoprenoid in vitro, which employs a gene coding for a neryl diphosphate synthase and rubber particles bound to a protein encoded by the gene, or a method for producing a polyisoprenoid, which includes introducing into a plant a vector in which a gene coding for a neryl diphosphate synthase is linked to a promoter having a promoter activity that drives laticifer-specific gene expression to express a protein encoded by the gene specifically in laticifers.