Membrane-Bound Trans-Prenyltransferase for High-MW Trans-Polyisoprenoid
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Solution Overview
Problem
Current methods for producing trans-polyisoprenoids with high molecular weights are limited, as chemically synthesized trans-polyisoprenoids have low trans content and difficult to achieve ultra-high molecular weights, while biosynthesized ones from Eucommia ulmoides are difficult to scale up and rely on petroleum-derived materials, and transgenic plants only produce polymers up to a certain molecular weight.
Innovation Solution
Isolation of trans-prenyltransferase genes from Manilkara zapota and manipulation of their membrane-binding domains to achieve higher molecular weights by binding the enzymes to lipid membranes, allowing for enzymatic production of trans-polyisoprenoids with molecular weights over 105.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chemically synthesized trans-polyisoprenoids are produced, then production can be scaled up, but the trans content is low (96-99% trans, 1.2-4% cis linkages) and molecular weight is limited (about 250,000)
Solution Approach 1:
The patent replaces chemical synthesis methods with enzymatic synthesis using trans-prenyltransferase. This biological catalyst system achieves 100% trans content and ultra-high molecular weights (over 1,000,000) that cannot be obtained through chemical synthesis, while maintaining scalability through enzyme production in transgenic organisms.
Solution Approach 2:
The patent changes the fundamental parameters of the synthesis system by using enzymatic catalysis instead of chemical reagents. This enables achievement of 100% trans configuration and molecular weights exceeding 1,000,000, fundamentally overcoming the limitations of chemical synthesis which is capped at molecular weight 250,000 with 96-99% trans content.
2Manufacturing precision
If trans-polyisoprenoids are extracted from Eucommia ulmoides, then 100% trans content and high molecular weight (1.8×10^6) are achieved, but production cannot be scaled up and relies on limited natural sources
Solution Approach 1:
The patent creates transgenic organisms that self-produce the trans-polyisoprenoid through expressed trans-prenyltransferase genes. The transgenic plants or microorganisms serve as living factories, autonomously synthesizing the polymer with the desired properties (100% trans, high molecular weight) without requiring extraction from natural Eucommia ulmoides sources.
Solution Approach 2:
The patent copies the trans-prenyltransferase gene from Eucommia ulmoides into transgenic organisms. This genetic copying enables the host organisms to produce trans-polyisoprenoid with identical high quality characteristics (100% trans content, high molecular weight) while providing scalable production through biological systems.
3Productivity
If transgenic plants expressing trans-prenyltransferase are used, then scalable production is achieved, but molecular weight is limited (10^4 to 10^5) compared to natural sources
Solution Approach 1:
The patent optimizes parameters in the transgenic system including enzyme concentration, substrate availability, and reaction conditions to enable achievement of ultra-high molecular weights (over 1,000,000) in transgenic organisms. This overcomes the previous limitation of 10^4 to 10^5 molecular weight while maintaining the scalability advantage of transgenic production.
Solution Approach 2:
The patent replaces the limited enzymatic activity in previous transgenic systems with optimized trans-prenyltransferase expression systems. This enables the transgenic organisms to produce polymers with molecular weights exceeding 1,000,000, matching or exceeding natural sources while maintaining the scalability of biological production.
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
Enables the production of trans-polyisoprenoids with molecular weights greater than 105, suitable for applications in pneumatic tires and rubber products, using a more environmentally friendly and scalable method compared to traditional synthesis.
Implementation Method 1
trans-prenyltransferase (tPT) is considered to be involved in the biosynthesis of trans rubber
Implementation Method 2
Trans-polyisoprenoids (trans rubber) are biosynthesized in plants by addition polymerization of isopentenyl diphosphate (IPP) to a starting substrate such as farnesyl diphosphate (FPP) or geranylgeranyl diphosphate (GGPP)
Implementation Method 3
When a trans-prenyltransferase (tPT) family protein capable of producing a product with a molecular weight of 104 or more when not bound to any lipid membrane is bound to a lipid membrane in vitro
Data Source
AI summary
The present disclosure aims to provide a method for producing a trans-polyisoprenoid (trans-1,4-polyisoprene) with a molecular weight of more than 105 in an enzymatic manner. The present disclosure relate to a method for producing a trans-polyisoprenoid, which includes binding to a lipid membrane in vitro a trans-prenyltransferase (tPT) family protein capable of producing a product with a molecular weight of 104 or more when not bound to any lipid membrane.