Renilla Luciferase Codon Optimization and Destabilization
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Solution Overview
Problem
Current reporter genes, such as Renilla luciferase, face challenges in maximizing expression levels and minimizing regulatory interference in non-native organisms, leading to suboptimal signal production for gene expression studies.
Innovation Solution
Optimized nucleotide sequences for Renilla luciferase are developed by screening codon variants and eliminating regulatory motifs, resulting in higher expression levels and reduced half-life through protein destabilization domains, enhancing signal production in human cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wild-type Renilla luciferase nucleotide sequences are used, then the reporter gene can be expressed in non-native organisms, but regulatory motifs in the sequence interfere with expression levels and produce suboptimal signal
Solution Approach 1:
The patent removes regulatory motifs from the Renilla luciferase nucleotide sequence through site-directed mutagenesis. Specific transcription factor binding sites and regulatory elements are eliminated or mutated while preserving the coding sequence, thereby eliminating interference with expression levels in non-native organisms
Solution Approach 2:
The patent optimizes codon usage by replacing rare codons with more frequently used codons in the host organism. This codon optimization changes the nucleotide sequence parameters without altering the amino acid sequence, thereby improving translation efficiency and expression levels
2Reliability
If the luciferase protein has extended half-life, then signal detection is easier, but background noise increases and sensitivity decreases
Solution Approach 1:
The patent introduces protein destabilization domains (such as PEST sequences) that modify the half-life parameter of the luciferase protein. These domains promote controlled degradation of the protein, reducing background noise while maintaining sufficient signal for detection, thereby improving measurement precision and sensitivity
3Productivity
If codon usage is not optimized, then the nucleotide sequence is simpler, but expression levels in heterologous systems are suboptimal
Solution Approach 1:
The patent performs comprehensive codon optimization by systematically replacing codons according to the frequency preferences of the host organism. This changes the nucleotide composition parameters of the gene sequence, improving translation efficiency and expression levels in heterologous systems without altering the protein sequence
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 optimized Renilla luciferase sequences exhibit significantly higher expression levels compared to wild-type versions, providing a more sensitive and reliable tool for gene expression studies.
Implementation Method 1
The Renilla luciferase protein catalyzes oxidation of its coelenterazine substrate in the reaction shown below to produce light at 480 nm
Data Source
AI summary
This invention provides modified nucleotide sequences encoding luciferase that have greater expression than wild type luciferase.