Laccase Variant Mutation at Position 113 for Yield Improvement
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Solution Overview
Problem
The yield of laccase enzymes, particularly CotA laccases, is often low in heterologous expression systems due to misfolding and aggregation, limiting their industrial applications in processes like biomass pretreatment and bioremediation.
Innovation Solution
Introducing a specific mutation at position 113 of the laccase sequence, replacing polar amino acids with non-polar residues like proline, improves the yield and stability of laccase variants in both prokaryotic and eukaryotic expression systems, enhancing their solubility and activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laccase enzymes are expressed in heterologous expression systems, then productivity is improved, but the yield is low due to misfolding and aggregation
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence at position 113, replacing polar residues (Asp, Glu, Tyr) with non-polar residues (Pro, Ala, Gly, Val). This chemical parameter change in the protein structure improves folding efficiency and reduces aggregation, thereby increasing the yield of soluble active laccase by at least 50% while maintaining high productivity in heterologous expression systems
2Productivity
If laccase enzymes are expressed in heterologous expression systems, then productivity is improved, but manufacturing precision is worsened due to misfolding
Solution Approach 1:
The patent modifies the chemical parameters of the laccase protein by substituting polar amino acids with non-polar amino acids at position 113. This parameter change alters the local hydrophobicity and conformational preferences, guiding the protein to fold correctly with higher precision and reducing misfolding events during heterologous expression
Solution Approach 2:
The mutated laccase variant exhibits self-improved folding properties without requiring external chaperones or complex expression conditions. The amino acid substitution at position 113 enables the protein to self-correct its folding pathway, automatically achieving proper structure with higher yield in heterologous systems
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 mutation increases the yield of soluble active laccase enzymes by at least 50%, leading to improved volumetric activity and broader industrial applications, including pulp delignification and wastewater detoxification.
Implementation Method 1
Laccases are enzymes having a wide taxonomic distribution and belonging to the group of multicopper oxidases. Laccases are eco-friendly catalysts that use molecular oxygen from air to oxidize various phenolic and non-phenolic lignin-related compounds as well as highly recalcitrant environmental pollutants, and produce water as the only side-product.
Data Source
AI summary
This application relates to laccase variants and uses thereof as eco-friendly biocatalysts in various industrial processes. More in particular, the disclosure relates to a polypeptide with laccase activity comprising an amino acid sequence that is more than 80% identical to the amino acid sequence according to SEQ ID NO: 1, wherein the polypeptide comprises a non-polar amino acid, preferably an amino acid residue selected from the group consisting of proline, alanine, glycine and valine at a position corresponding to amino acid 113 of SEQ ID NO: 1.