Alkanoyl-CoA Synthetase Enzymes for Hexanoyl-CoA Synthesis
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Solution Overview
Problem
Current technologies lack effective enzymes and nucleotide sequences for synthesizing aromatic polyketides, particularly hexanoyl-CoA, which are crucial for cannabinoid biosynthesis in Cannabis sativa, limiting the ability to engineer cannabinoid production levels and biosynthesis in plants and microorganisms.
Innovation Solution
Identification and characterization of two novel genes, Cannabis sativa hexanoyl-CoA synthetase 1 (CsHCS1) and Cannabis sativa hexanoyl-CoA synthetase 2 (CsHCS2), which encode alkanoyl-CoA synthetases, enabling the synthesis of hexanoyl-CoA and subsequent manipulation of cannabinoid compound levels through genetic engineering and metabolic pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional acyl-CoA synthetases are used, then general fatty acid activation occurs, but specific medium-chain hexanoyl-CoA synthesis is insufficient
Solution Approach 1:
The patent identifies and characterizes specific acyl-CoA synthetase enzymes (AAE7, At4g05160, At5g63380 from Arabidopsis and Pseudomonas spp.) that have specialized catalytic properties for activating medium-chain fatty acids. These enzymes possess local quality in their active sites that specifically accommodate C6-C10 substrates, enabling selective hexanoyl-CoA production rather than general fatty acid activation.
Solution Approach 2:
The invention utilizes enzymes with optimized kinetic parameters for medium-chain substrates. The characterized synthetases exhibit specific Km and Vmax values that favor hexanoyl-CoA formation, representing parameter changes in enzyme substrate affinity and catalytic efficiency that distinguish them from broad-specificity acyl-CoA synthetases.
2Quantity of substance
If gene knockout techniques are applied to reduce cannabinoid levels, then cannabinoid production decreases, but lack of effective enzymes limits precision in metabolic engineering
Solution Approach 1:
The patent enables feedback control of cannabinoid biosynthesis by providing characterized enzymes and genes that can be used to monitor and regulate metabolic flux. By introducing or modifying specific acyl-CoA synthetase genes, the system allows for controlled adjustment of hexanoyl-CoA availability, which in turn regulates the output of cannabinoid products through the olivetolic acid pathway.
Solution Approach 2:
The invention uses hexanoyl-CoA as a controllable intermediary metabolite in the cannabinoid biosynthetic pathway. By precisely controlling the activity and expression of specific acyl-CoA synthetases that produce hexanoyl-CoA, the patent enables indirect but precise control over downstream cannabinoid production, allowing fine-tuning of metabolic engineering outcomes.
3Productivity
If heterologous expression systems are used to produce cannabinoids, then production capacity increases, but lack of specific enzymes reduces efficiency
Solution Approach 1:
The patent identifies acyl-CoA synthetase enzymes with broad substrate acceptance within the medium-chain range that can function effectively in heterologous expression systems. These enzymes possess universal catalytic mechanisms that accommodate various C6-C10 fatty acid substrates, enabling their use in diverse host organisms for cannabinoid production without requiring extensive enzyme engineering.
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
These enzymes allow for the regulation of cannabinoid production in plants, enabling the creation of cannabis varieties with altered cannabinoid levels, and their use in heterologous organisms or cell-free systems for producing cannabinoids or analogs, thereby overcoming the limitations of existing technologies.
Implementation Method 1
Acyl-CoA synthetases from Pseudomonas spp. have been shown to act on medium-chain fatty acids such as hexanoate
Implementation Method 2
These enzymes act on a variety of carboxylate acids including short-, medium-, long- and very long-chain fatty acids, jasmonate precursors, phenylpropanoid-derived acids (e.g. cinnamic acid) and other organic acids such as malonate, acetate and citrate
Data Source
Figure 1
Figure 2A~2F
Figure 3A~3B
AI summary
Polypeptides having alkanoyl-CoA activity have been identified and characterized, as have nucleic acids encoding these polypeptides. Expression or over-expression of the nucleic acids alters levels of cannabinoid compounds in organisms. The polypeptides may be used in vivo or in vitro to produce cannabinoid compounds.