Modified Lipase Variants for High-Temperature Reactivity and Stability
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Solution Overview
Problem
Candida cylindracea-derived lipases exhibit limited stability and reactivity at high temperatures, limiting their industrial applications and productivity.
Innovation Solution
Modification of the Candida cylindracea-derived lipase through specific amino acid substitutions, such as S282P and S283Y, enhances its reactivity and stability at high temperatures, resulting in improved enzyme variants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If amino acid substitutions are introduced to improve high-temperature reactivity, then enzyme activity at elevated temperatures increases, but protein structure stability may be compromised
Solution Approach 1:
The patent applies parameter changes by systematically modifying amino acid residues at specific positions (282 and 283) to alter the enzyme's catalytic properties. The substitutions S282P, S282T, S283P, and S283T were designed to enhance high-temperature reactivity while maintaining structural integrity through controlled parameter modification at critical active site positions.
Solution Approach 2:
The invention implements local quality by introducing specific amino acid substitutions at localized positions (282 and 283) within the lipase molecule. These targeted local modifications at the acyl-binding pocket region improve high-temperature catalytic activity without disrupting the overall global protein structure, demonstrating that localized quality changes can resolve the contradiction between reactivity and stability.
2Stability of the object's composition
If multiple amino acid substitutions are introduced to enhance stability at high temperature, then thermal stability improves, but enzyme reactivity may be reduced
Solution Approach 1:
The patent utilizes parameter changes by systematically varying amino acid substitutions at positions 282 and 283 to optimize the balance between thermal stability and reactivity. Through controlled parameter modification (substituting serine with proline or threonine), the invention achieves enhanced thermal stability while preserving or improving high-temperature catalytic activity.
Solution Approach 2:
The invention applies partial action by introducing limited amino acid substitutions (only at positions 282 and 283) rather than comprehensive modifications throughout the protein structure. This targeted partial modification approach provides sufficient thermal stability improvement while minimizing potential negative impacts on enzyme reactivity that could arise from excessive or widespread mutations.
3Productivity
If the lipase is used at high temperatures to increase productivity, then reaction rate improves, but enzyme stability decreases
Solution Approach 1:
The patent implements parameter changes by modifying amino acid residues to shift the enzyme's operational parameters, enabling it to maintain stability at higher temperatures. The substitutions at positions 282 and 283 alter the local structural parameters and thermal properties, allowing the lipase to sustain high reaction rates at elevated temperatures without suffering from stability loss.
Solution Approach 2:
The invention applies dynamics by enhancing the enzyme's adaptability to temperature changes through amino acid substitutions. The modified lipase exhibits dynamic stability, maintaining its functional structure across a broader temperature range, which enables sustained high productivity at elevated temperatures where the wild-type enzyme would denature.
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 lipases demonstrate 1.5 to 10 times higher relative activity and 1.1 to 2.0 times higher residual activity at elevated temperatures, expanding their utility in industrial processes.
Implementation Method 1
A lipase is an enzyme that acts on ester bonds in lipids. The modified lipase has improved reactivity and stability at high temperatures compared to the wild-type lipase.
Implementation Method 2
A lipase is an enzyme that acts on ester bonds in lipids... for the degradation of fats and oils
Data Source
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AI summary
The present invention has an object of providing a modified lipase having excellent stability and reactivity at a high temperature. Provided is a modified lipase with improved reactivity and/or stability at a high temperature, the modified lipase having an amino acid sequence including one or more amino acid substitutions which are selected from the group consisting of T130C-S153C, A249P, F259Y, S282P, S283Y and S300P in the amino acid sequence represented by SEQ ID NO: 1, or an amino acid sequence having 90% or more sequence identity therewith.