Microbial Tricyclene Production via Terpene Synthase Engineering
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Solution Overview
Problem
Current methods fail to produce tricyclene efficiently in microbial organisms, despite its potential as a superior gasoline component due to its octane properties and oxidative stability, as existing terpene synthases do not effectively convert geranyl pyrophosphate to tricyclene in vivo.
Innovation Solution
Engineer microbial cells to express heterologous terpene synthases, such as bornyl diphosphate synthase or camphene synthase variants with specific amino acid substitutions, to convert geranyl diphosphate to tricyclene, and co-express prenyl transferase with IPP and DMAPP to produce geranyl pyrophosphate, optimizing fermentation conditions for enhanced tricyclene production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If existing terpene synthases are used to convert geranyl pyrophosphate to monoterpenes in microbial organisms, then the microbial cells can produce monoterpenes, but tricyclene production is insufficient or non-existent
Solution Approach 1:
The patent applies parameter changes by introducing specific amino acid substitutions at defined positions in the terpene synthase protein sequence. These substitutions modify the enzyme's catalytic properties to enable tricyclene production. The patent specifies substitutions at positions such as 270, 294, 366, 373, 404, 414, 460, and 525, where certain amino acid changes (e.g., from wild-type to mutant residues) fundamentally alter the enzyme's ability to convert geranyl pyrophosphate into tricyclene, transforming a non-functional or low-functional enzyme into an effective producer of the desired compound.
2Quantity of substance
If heterologous terpene synthases are expressed in microbial cells, then tricyclene production increases, but the complexity of the microbial system increases
Solution Approach 1:
The patent applies segmentation by dividing the terpene synthase enzyme into functional regions or domains that can be independently analyzed and modified. The enzyme is segmented into specific functional sites (such as the active site and structural domains) where specific amino acid substitutions are introduced. This segmentation allows researchers to target specific regions for modification without affecting the entire enzyme structure, thereby achieving tricyclene production while managing system complexity through modular approach to enzyme engineering.
3Quantity of substance
If prenyl transferase is co-expressed with terpene synthase, then geranyl pyrophosphate production increases, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies merging by combining the expression of prenyml transferase and terpene synthase in the same microbial host cell. This creates an integrated biosynthetic pathway where prenyml transferase produces geranyl pyrophosphate from IPP and DMAPP, and the terpene synthase immediately converts this substrate into tricyclene. By merging these two enzymatic functions into a single cellular system, the patent eliminates the need for separate production steps and intermediate purification, thereby increasing geranyl pyrophosphate availability while managing process complexity through functional integration.
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 method achieves tricyclene production levels of at least 0.5% or 5% of total monoterpene production, surpassing previous attempts and making it viable for use in fuel compositions, with variant terpene synthases producing higher amounts than their wild-type counterparts.
Implementation Method 1
a terpene synthase that converts geranyl pyrophosphate to tricyclene
Implementation Method 2
Terpene synthases (also sometimes referred to as terpene cyclases) catalyze formation of the monoterpene products
Implementation Method 3
contacting the prenyml transferase with IPP and DMAPP to yield geranyl pyrophosphate
Implementation Method 4
In one aspect, the microbial organism is cultured under fermentation conditions in a fermentation medium
Data Source
AI summary
The present invention relates to methods for producing monoterpenes, particularly tricyclene, by culturing microbial organisms that express a terpene synthase and optionally a prenyl transferase.