Cellobiohydrolase Variants with B2-Loop Deletions
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Solution Overview
Problem
There is a need for cellobiohydrolase variants with improved properties to enhance the efficiency of saccharification of lignocellulosic feedstocks, as existing enzymes may not effectively convert cellulose into fermentable sugars for ethanol production.
Innovation Solution
Development of cellobiohydrolase variants with deletions at specific positions, such as 195, 196, 197, and 198, which maintain cellobiohydrolase activity and improve specific performance by optimizing enzyme performance on cellulose substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing cellobiohydrolase enzymes are used for saccharification, then the process can proceed, but the efficiency of converting cellulose into fermentable sugars is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of cellobiohydrolase enzymes through site-directed mutagenesis. Specific residues in the B2-loop region (positions 194-201) were mutated to alter enzyme-substrate interaction parameters, resulting in variants with significantly improved saccharification efficiency while maintaining structural integrity and catalytic function.
Solution Approach 2:
The invention implements local quality by making targeted mutations in the B2-loop region of the cellobiohydrolase enzyme rather than global modifications. This localized approach focuses improvements on the specific region responsible for substrate binding and catalysis, enhancing saccharification efficiency without compromising overall enzyme stability or introducing unnecessary changes elsewhere in the structure.
2Productivity
If cellobiohydrolase variants with deletions at positions 195-198 are created, then specific performance increases, but enzyme structure is modified
Solution Approach 1:
The patent employs parameter changes by introducing deletions at specific positions (195-198) within the B2-loop region of cellobiohydrolase. This targeted modification alters local structural parameters to improve substrate access and catalytic efficiency, achieving enhanced specific performance while the overall enzyme architecture remains intact and functional.
Solution Approach 2:
The invention applies the extraction principle by removing specific amino acid residues (deletions at positions 195-198) from the B2-loop region of the enzyme. This selective removal extracts problematic structural elements that hinder substrate binding, thereby improving specific performance without eliminating entire functional domains or compromising the core catalytic mechanism.
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 variants demonstrate increased specific performance in degrading cellulose, leading to enhanced saccharification efficiency and improved ethanol production from lignocellulosic materials.
Implementation Method 1
Cellobiohydrolases sequentially release molecules of cellobiose from the ends of the cellulose polymer
Data Source
AI summary
The present invention relates to cellobiohydrolase variants. The present invention also relates to polynucleotides encoding the variants; nucleic acid constructs, vectors, and host cells comprising the polynucleotides; and methods of using the variants.