Mammalian Protein Expression Vector Using T7 Promoter and Signal Peptide
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Solution Overview
Problem
Current methods for protein expression in mammalian cell lines face challenges such as low yield, difficulty in producing challenging targets, and high costs, especially for academic setups.
Innovation Solution
A novel nucleic acid expression vector is developed, comprising an expression cassette with a promoter, nucleic acid encoding a Gaussia luciferase signal peptide, a multiple cloning site, and a 3′ UTR, optimized to be smaller than 5000 base pairs, which enhances protein expression and secretion in mammalian cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional expression vectors are used in mammalian cell lines, then proper glycosylation and protein folding are achieved, but protein yield is low
Solution Approach 1:
The patent modifies the expression vector by changing key parameters: using a T7 promoter instead of conventional mammalian promoters, incorporating an rBS (ribosome binding site) sequence, and using a truncated form of the T7 gene 10 protein as a leader peptide. These parameter changes enable high-level protein expression while maintaining proper folding and glycosylation in mammalian cells.
Solution Approach 2:
The patent introduces an intermediary element - the T7 gene 10 protein leader peptide - that mediates between the T7 promoter and the target protein. This leader peptide is specifically designed to be cleaved by signal peptidase, allowing the ribosome to efficiently translate the target protein while maintaining proper post-translational modifications.
2Productivity
If extensive R&D work is performed to create fine-tuned cell lines and improve media formulation, then mammalian recombinant yields are improved, but costs increase
Solution Approach 1:
The patent extracts and isolates the critical functional elements needed for high yield - the T7 promoter, rBS sequence, and truncated T7 gene 10 protein - and combines them into a single expression vector. This extraction eliminates the need for extensive R&D in cell line engineering and media formulation, significantly reducing production costs while maintaining high recombinant yields.
Solution Approach 2:
The patent employs a disposable expression vector system that can be easily synthesized and used without requiring expensive, time-consuming cell line development. The vector itself acts as a consumable tool that provides high yield expression immediately upon introduction into mammalian cells, eliminating the need for costly long-term cell line maintenance and optimization.
3Adaptability or versatility
If academic setups use limited budget resources, then difficult targets can be produced, but yield remains low
Solution Approach 1:
The patent creates a universal expression vector system based on the T7 promoter that can express a wide range of difficult-to-produce proteins in mammalian cells. The vector's design with the rBS sequence and truncated leader peptide makes it universally applicable to various protein targets, enabling academic researchers to produce difficult targets at high yield levels without requiring target-specific optimization.
Data Source
AI summary
The present invention relates to in vitro expression of proteins and particularly, although not exclusively, to expression of proteins in mammalian cell lines. In particular, the present invention relates to the provision of a novel vector for protein expression, and methods of using such vector in the expression of proteins in mammalian cell lines.