Mutant TEV Protease Catalytic Efficiency
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Solution Overview
Problem
Current high-throughput protease screening methods for mutant proteases are laborious and inefficient, limiting the development of proteases with improved catalytic activity, such as TEV proteases, which are essential for applications like protein purification and fusion protein cleavage.
Innovation Solution
Development of mutant TEV proteases with specific amino acid substitutions, such as eTEV, which exhibits an 8-fold higher catalytic efficiency and increased turnover rate, achieved through directed evolution and structural optimization, including mutations at positions S3, P8, S31, A231, and S219, resulting in enhanced interactions with substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If directed evolution methods are used to engineer proteases, then protease variants with desired phenotypes can be isolated, but laborious design-build-test cycles slow progress
Solution Approach 1:
The patent applies preliminary action by pre-engineering mutant proteases with specific amino acid substitutions (S3I, P8Q, S31T, A231V, T173A, S219R) based on structural modeling and rational design before screening. This allows the proteases to possess desired catalytic properties beforehand, eliminating the need for iterative design-build-test cycles and directly achieving the desired phenotype isolation.
2Ease of manufacture
If traditional TEV proteases are used for fusion protein cleavage, then tag removal can be achieved, but catalytic efficiency and turnover rate are limited
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence parameters of TEV protease through specific substitutions (S3I, P8Q, S31T, A231V, T173A, S219R). These parameter changes in the protein structure lead to enhanced catalytic efficiency and turnover rate while maintaining the fusion protein cleavage function, thereby resolving the contradiction between ease of manufacture and productivity.
Data Source
AI summary
The present disclosure, in some aspects, provides mutant TEV proteases that exhibit improved activity, where the mutant TEV exhibits increase efficiency and/or an increased Kcat for cleavage of an amino acid sequence, and TEV proteases are commonly used for laboratory methods including cleaving fusion proteins and removing a purification tag, such as a maltose binding protein or a poly-histidine tag, from a fusion protein or an antibody.