Protease Variants for Enhanced Polylactic Acid Degradation
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Solution Overview
Problem
There is a need for proteases with improved activity to enhance the efficiency of biodegradable plastic production processes and biological polyester degrading processes, as existing proteases are not sufficiently effective in degrading polymers like polylactic acid (PLA).
Innovation Solution
Development of protease variants with specific amino acid substitutions, such as S101F/L/M/W/Y, S103L, T106I/L, G131I, or G133K, which exhibit increased polyester degrading activity compared to wild-type proteases, particularly for degrading polylactic acid (PLA).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wild-type proteases are used for degrading polyester and polylactic acid, then the degradation process can proceed, but the degradation activity and efficiency are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the protease at specific positions (S101, S103, T106, G131, G133) to create variants with improved polyester degrading activity. The substitutions include S101F/L/M/W/Y, S103L, T106I/L, G131I, or G133K, which enhance the enzyme's catalytic efficiency toward polyester substrates while maintaining overall protease functionality.
2Productivity
If protease variants with multiple amino acid substitutions are developed, then polyester degrading activity increases by 5% to 500%, but the complexity of protein engineering and characterization increases
Solution Approach 1:
The patent applies local quality by making targeted amino acid substitutions at specific positions (S101, S103, T106, G131, G133) within the protease sequence rather than globally modifying the entire protein. This localized approach allows precise optimization of polyester-binding and catalytic regions while preserving the overall protein structure and other functional regions.
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 protease variants demonstrate enhanced polyester degrading activity, with improvements ranging from 5% to 500% compared to wild-type proteases, suitable for industrial processes and environmental degradation of plastics.
Implementation Method 1
Proteases are able to catalyze the hydrolysis of a variety of polymers, including polyesters. In this context, proteases have shown promising effects in a number of industrial applications
Implementation Method 2
enzymes are able to accelerate hydrolysis of polyester containing material, and more particularly of plastic products, even down to the monomer level
Data Source
Figure 1A~1C
AI summary
The present invention relates to novel proteases, more particularly to protease variants having improved activity compared to the protease of SEQ ID N°l and the uses thereof for degrading polyester containing material, such as plastic products. The proteases of the invention are particularly suited to degrade polylactic acid, and material containing polylactic acid.