Recombinant Polypeptides for Mango Lactone Biosynthesis
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Solution Overview
Problem
The mechanism of lactone biosynthesis in mangoes is not fully understood, and there is a need to increase lactone production using enzymes known to be precursors for lactone biosynthesis.
Innovation Solution
The process involves synthesizing and expressing specific nucleotide sequences encoding epoxide hydrolase 2 and peroxygenase enzymes in host cells, such as E. coli, to convert unsaturated fatty acids into epoxy and di-hydroxy fatty acids, which then undergo oxidation to produce lactones like δ-valerolactone, γ-hexalactone, and δ-hexalactone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used for lactone biosynthesis in mangoes, then the natural flavor profile is maintained, but the production of specific lactones remains low and insufficient for enhanced flavor quality
Solution Approach 1:
The patent applies parameter changes by modifying the genetic parameters of mango plants through recombinant DNA technology. Specific nucleotide sequences encoding epoxide hydrolase 2 and peroxygenase enzymes are introduced and overexpressed, changing the enzymatic parameters to enhance lactone biosynthesis activity and productivity
Solution Approach 2:
The patent uses intermediary enzymes (epoxide hydrolase 2 and peroxygenase) as mediators in the lactone biosynthesis pathway. These recombinant enzymes act as intermediaries that catalyze specific reactions converting fatty acids to lactones, thereby increasing lactone production and concentration in mangoes
2Loss of information
If the biosynthesis pathway is not fully understood, then research progress is limited, but identifying specific enzymes and pathways enables targeted enhancement of lactone production
Solution Approach 1:
The patent applies preliminary action by first identifying and characterizing the specific nucleotide sequences and enzymes involved in lactone biosynthesis before attempting to enhance production. The complete nucleotide sequences encoding epoxide hydrolase 2 and peroxygenase are determined and characterized in advance, providing the necessary knowledge foundation for subsequent productivity enhancement through recombinant expression
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 method significantly increases the production of specific lactones in mangoes, enhancing their flavor quality by overexpressing the recombinant polypeptides involved in lactone synthesis, as demonstrated through transient expression in mango tissues.
Implementation Method 1
catalyzing conversion of unsaturated fatty acids to epoxy fatty acids in presence of the recombinant polypeptide peroxygenase
Implementation Method 2
catalyzing conversion of the epoxy fatty acids from step (c) to di-hydroxy fatty acids in presence of the recombinant polypeptide epoxide hydrolase 2
Data Source
Figure 1~2(b)
Figure 3
Figure 4~5(b)
AI summary
The present invention provides the polynucleotide encoding enzyme involved in lactone synthesis and a process for synthesis of lactones using said polynucleotides. The invention also provides recombinant plasmid expression vector comprising said polynucleotide sequence. The recombinant protein encoded by said polynucleotides leads to synthesis of lactones having flavour peculiar to Alphonso mangoes.