CPMV 5' UTR Expression Enhancer for Plant Protein Production
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Solution Overview
Problem
Current methods for producing foreign proteins in plants using transgenic plants are time-consuming and labor-intensive, and plant virus-based expression vectors face limitations in biocontainment and insert size, particularly with full-length viral vectors.
Innovation Solution
The development of an expression enhancer comprising a Cowpea mosaic virus (CPMV) 5' untranslated region (UTR) sequence, which can be modified to include a stuffer sequence and plant kozak sequences, enhances protein expression by optimizing the nucleotide sequence and regulatory regions for efficient translation and biocontainment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transgenic plants are used to produce foreign proteins, then stable expression can be achieved, but the process is time-consuming and labor-intensive
Solution Approach 1:
The patent extracts and utilizes the 5' UTR region of CPMV RNA-2 as a separate functional element that can be independently cloned and applied to enhance translation initiation. This allows the creation of expression vectors that achieve high-level transient expression without requiring full viral replication, thus reducing time and labor requirements while maintaining stable protein expression.
2Productivity
If full-length viral vectors are used, then high level transient expression can be achieved, but biocontainment is compromised and insert size is limited
Solution Approach 1:
The patent extracts only the essential 5' UTR region (nucleotides 1-160) of CPMV RNA-2, which contains the translation initiation elements, while excluding the replicase and other viral genes responsible for replication and spread. This extracted enhancer element enables high-level transient expression of foreign proteins in plants without conferring viral replication capability, thus maintaining biocontainment while achieving high productivity.
Solution Approach 2:
The patent segments the viral genome into functional regions, isolating the 5' UTR as a distinct enhancer element that can be separately applied to expression vectors. This segmentation allows the 5' UTR to function as a translation enhancer without the harmful replication capabilities of the full viral genome, resolving the contradiction between high expression and biocontainment.
3Productivity
If sequences are inserted upstream of the 512 start codon, then protein expression can be enhanced, but the reading frame may be shifted by polylinkers
Solution Approach 1:
The patent optimizes the local sequence characteristics of the 5' UTR region, specifically nucleotides 1-160, to enhance translation initiation without introducing polylinkers that could shift reading frames. The enhanced 5' UTR contains optimized Kozak sequences and structural elements that promote efficient translation while maintaining precise reading frame alignment, thus resolving the contradiction between expression level and manufacturing precision.
Data Source
AI summary
An expression enhancer comprising a CPMV 5′UTR nucleotide sequence consisting of X nucleotides (CMPVX), where X=160, 155, 150, or 114 of SEQ ID NO:1, or consisting of a nucleotide sequence comprising from about 80% to 100% sequence similarity with CMPVX, where X=160, 155, 150, or 114 of SEQ ID NO:1 SEQ ID NO:1 is provided. The expression enhancer may further comprise a stuffer sequence fused to the 3′ end of the 5′UTR nucleotide sequence (CMPVX+, where X=160, 155, 150, or 114 of SEQ ID NO:1). The stuffer sequence may comprise one or more plant kozak sequences. Plants comprising the expression enhancer and methods using the expression enhancer are also described