Modified Luciferase Substrate Specificity Mutation
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Solution Overview
Problem
Existing firefly luciferase enzymes maintain high reactivity with D-luciferin, making it impossible to construct a luminescent system that specifically reacts with substrates having emission wavelengths different from D-luciferin, limiting applications such as multicolor imaging techniques.
Innovation Solution
Modified luciferase enzymes with mutations at specific amino acid positions, particularly the 347th amino acid, are developed to enhance substrate specificity for other-color luminescent substrates like AkaLumine, reducing reactivity with D-luciferin while maintaining or improving reactivity with alternative substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If firefly luciferase maintains high reactivity with D-luciferin, then the luminescent system works efficiently with the natural substrate, but it cannot specifically react with other-color luminescent substrates having different emission wavelengths
Solution Approach 1:
The patent applies parameter changes by mutating specific amino acid residues in the firefly luciferase sequence (particularly positions 347, 229, and 310) to alter the enzyme's substrate binding properties. These parameter changes in the protein structure enable the modified luciferase to recognize and react with other-color luminescent substrates like AkaLumine while reducing reactivity with D-luciferin, thus achieving improved substrate specificity for different emission wavelengths
2Adaptability or versatility
If the luminescent system uses D-luciferin as substrate, then it achieves reliable light emission, but it limits the ability to perform multicolor imaging techniques requiring different emission wavelengths
Solution Approach 1:
By changing the amino acid parameters at key positions in the luciferase sequence, the patent enables the enzyme to catalyze reactions with substrates that emit at different wavelengths. This allows the luminescent system to be adapted for multicolor imaging applications while maintaining controlled light emission through the specific substrate-enzyme pairing
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 modified luciferase enzymes exhibit significantly improved substrate specificity for other-color luminescent substrates, allowing for higher emission intensity and increased specificity, enabling more versatile applications in biotechnology and imaging techniques.
Implementation Method 1
Light emission from fireflies, widely known as bioluminescence, occurs due to a reaction of a luminescent system of firefly luciferin (D-luciferin)-firefly luciferase
Implementation Method 2
a luminescent system of D-luciferin-luminescent Coleoptera luciferase can be used for analyzing efficiencies of gene expression
Data Source
Figure 1
AI summary
In order to provide modified luciferase whose substrate specificity to at least one luminescent substrate (e.g., AkaLumine) other than D-luciferin has been improved as compared with to D-luciferin, modified luciferase according to an aspect of the present invention has a mutation at an amino acid corresponding to a 347th amino acid in an amino acid sequence represented by SEQ ID NO: 1.