Blue Anthocyanin Biosynthesis Using Acyltransferase Pathways
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Solution Overview
Problem
There is a lack of natural blue pigments in plants and food industry colorants, with existing synthetic alternatives facing consumer preference for natural options and limited availability of plant-derived blue anthocyanins due to incomplete biosynthetic pathways and cofactor availability.
Innovation Solution
A process for producing the blue anthocyanin verodelphin in eukaryotic cells by expressing specific genes and proteins, including acyltransferases, glucosyltransferases, and malonyltransferases, to catalyze the biosynthesis of delphinidin derivatives, enabling the production of blue flowers and fruits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic blue dyes are used to color flowers and food, then stable blue coloration is achieved, but consumer preference for natural colorants is not met and aesthetic quality is reduced
Solution Approach 1:
The invention modifies the chemical structure of anthocyanin molecules by introducing specific acyl groups (p-coumaroyl, feruloyl, sinapoyl) at defined positions to shift the absorption maximum into the blue region (620-680 nm). This structural parameter change transforms naturally occurring red-purple anthocyanins into blue-colored derivatives that meet consumer demand for natural colorants while achieving stable blue coloration.
Solution Approach 2:
The invention creates composite anthocyanin structures by combining the anthocyanin core with multiple acyl groups from different hydroxycinnamic acids. These composite molecules exhibit enhanced color stability and blue hue characteristics that neither the simple anthocyanin nor individual acyl groups could achieve alone.
2Quantity of substance
If blue anthocyanins are produced in plants, then natural blue colorants are available, but incomplete biosynthetic pathways and cofactor availability limit production
Solution Approach 1:
The invention divides the complex biosynthetic pathway into discrete enzymatic steps, each catalyzed by a specific acyltransferase enzyme. By identifying and characterizing individual enzymes (AT1, AT2, AT3) that perform specific acylation reactions, the pathway can be engineered step-by-step in heterologous hosts, making the complex process manageable and reproducible.
Solution Approach 2:
The invention uses acyl-CoA intermediates (p-coumaroyl-CoA, feruloyl-CoA, sinapoyl-CoA) as mediator molecules that connect the phenylpropanoid pathway to anthocyanin biosynthesis. These intermediates serve as substrates for acyltransferase enzymes, enabling the transfer of acyl groups to anthocyanin molecules and facilitating the production of blue-colored derivatives.
3Adaptability or versatility
If multiple acyltransferase enzymes are expressed to produce blue anthocyanins, then complete biosynthetic pathway is achieved, but process complexity and gene expression requirements increase
Solution Approach 1:
The invention identifies that a single acyltransferase enzyme can catalyze multiple acylation reactions at different positions (O-6, O-2, O-4) of the anthocyanin molecule. This multi-functionality reduces the number of genes that need to be introduced into heterologous hosts, simplifying the expression system while still achieving complete biosynthetic capability for various blue anthocyanin derivatives.
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 stable, natural blue pigments in plants and microorganisms, addressing the need for consumer-friendly food colorants and aesthetically pleasing flowers.
Implementation Method 1
The invention provides a process of producing the delphinidin derivative (IV) from the delphinidin derivative (III)... expressing, in said eukaryotic cells, an acyltransferase comprising a polypeptide comprising or consisting of: (a) the amino acid sequence of SEQ ID NO: 3
Implementation Method 2
A process of producing the delphinidin derivative (V) from the delphinidin derivative (IV)... expressing, in said eukaryotic cells, a glucosyltransferase comprising a polypeptide comprising or consisting of: (a) the amino acid sequence of SEQ ID NO: 4
Implementation Method 3
A process of producing the delphinidin derivative (VI) from the delphinidin derivative (V)... expressing, in said eukaryotic cells, a malonyltransferase comprising a polypeptide comprising or consisting of: (a) the amino acid sequence of SEQ ID NO: 5
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
The invention provides a process of producing delphinidin 3-O-[2-O-(6-O-p-coumaroyl)-glucosyl-6-O-p-coumaroyl] glucoside from delphinidin 3-O-(2-O-glucosyl-6-O-p-coumaroyl) glucoside. The invention also provides processes for the production of delphinidin 3-O-[2-O-(6-O-p-coumaroyl-glucosyl)-6-O-p-coumaroyl] glucoside 5-O-(6-O-malonyl)-glucoside. Enzymes allowing production of these compounds and genes encoding the enzymes are also provided.