Photoselected TEV Protease Variants for Faster Specific Cleavage
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Solution Overview
Problem
The slow catalytic turnover of the TEV protease limits the performance of biotechnological applications, such as FLARE, which requires faster catalysis for temporal resolutions of minutes or seconds, a goal unachievable with wild-type TEV.
Innovation Solution
Directed evolution of TEV proteases using yeast strains with fusion proteins and photoinducible protein binding pairs to enhance catalytic activity, including C-terminal truncated TEV variants and LOV domains, allowing for increased catalytic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wild-type TEV protease is used, then sequence-specificity is maintained, but catalytic rate is too slow for applications requiring temporal resolution of minutes or seconds
Solution Approach 1:
The patent applies directed evolution to change the amino acid sequence parameters of TEV protease, generating variants with improved catalytic rates. Specific mutations in the protease sequence alter its kinetic properties (kcat) while preserving its ability to recognize and cleave the TEV consensus sequence ENLYFQS, thus resolving the contradiction between speed and specificity.
2Productivity
If C-terminal truncated TEV variants are used, then catalytic efficiency is increased, but protein stability may be reduced
Solution Approach 1:
The patent removes the C-terminal portion of the TEV protease sequence to generate truncated variants. This extraction of the C-terminal region eliminates structural elements that may constrain catalytic activity, thereby increasing catalytic efficiency while the core catalytic domain remains intact to maintain sufficient stability for biotechnological applications.
3Loss of time
If directed evolution is applied to improve catalytic rate, then temporal resolution is achieved, but system complexity increases
Solution Approach 1:
The patent employs directed evolution in yeast systems where the protease variants are expressed and selected based on their catalytic performance in vivo. The system self-optimizes through selection pressure, allowing the identification of high-performance variants without requiring complex external characterization assays, thus reducing the practical complexity of the overall process.
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 TEV proteases exhibit improved catalytic rates, enabling faster and more efficient proteolysis in applications like FLARE and SPARK, achieving temporal resolutions of seconds.
Implementation Method 1
A yeast strain is provided, the yeast comprising: (a) a first fusion protein comprising: (i) a first member of a photoinducible protein binding pair; (ii) a TEV protease that cleaves the proteolytically cleavable linker
Implementation Method 2
a TEV protease that cleaves the proteolytically cleavable linker
Data Source
AI summary
Tobacco etch virus protease (TEV) is one of the most widely used proteases in biotechnology because of its exquisite sequence-specificity. A limitation of TEV is its slow catalytic rate, which limits product generation and therefore signal output. Provided is a generalizable yeast-based platform for directed evolution of protease catalytic properties. Protease activity is determined via proteolytic release of a membrane-anchored transcription factor, and access to TEV's cleavage site is temporally regulated using a photosensory LOV domain. By gradually decreasing light exposure time, faster variants of TEV were selected over multiple rounds of selection. The mutant TEV proteases and the directed evolution platform are useful in a wide range of biotechnology applications, such as FLARE and SPARK tools.