GH61 Variant Substitutions for Thermostable Lignocellulose Degradation
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Solution Overview
Problem
There is a need for GH61 polypeptides with enhanced thermostability for effective degradation of lignocellulose at high temperatures in enzyme compositions.
Innovation Solution
Development of GH61 polypeptide variants with specific substitutions at key positions, such as 26, 32, 34, 40, 41, 42, 47, 56, 72, 102, 123, 138, 149, 152, 163, 164, 166, 169, 186, 200, 207, 213, 219, 222, 234, 246, and 250, which exhibit increased thermostability and cellulolytic enhancing activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If GH61 polypeptides are used for degradation of lignocellulose at high temperatures, then the degradation efficiency is improved, but the polypeptide stability deteriorates due to thermal denaturation
Solution Approach 1:
The patent applies parameter changes by modifying amino acid residues at specific positions (26, 32, 34, 40, 41, 42, 47, 56, 72, 102, 123, 138, 149, 152, 163, 164, 166, 169, 186, 200, 207, 213, 219, 222, 234, 246, and 250) of the GH61 polypeptide sequence. These substitutions alter the physical and chemical properties of the polypeptide to enhance its thermostability while preserving its cellulolytic enhancing activity, allowing it to maintain stability and functionality at elevated temperatures required for efficient lignocellulose degradation
2Reliability
If GH61 polypeptide variants with multiple substitutions are developed, then the thermostability is improved, but the complexity of polypeptide characterization increases
Solution Approach 1:
The patent applies local quality by focusing mutations on specific key positions (26, 32, 34, 40, 41, 42, 47, 56, 72, 102, 123, 138, 149, 152, 163, 164, 166, 169, 186, 200, 207, 213, 219, 222, 234, 246, and 250) rather than random mutagenesis. This targeted approach at structurally important positions allows systematic characterization of individual substitution effects on thermostability, reducing the complexity of polypeptide characterization while achieving the desired stability improvements
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 GH61 polypeptide variants maintain enhanced activity at elevated temperatures, facilitating efficient degradation and conversion of cellulosic materials into fermentation products.
Implementation Method 1
Many microorganisms produce enzymes that hydrolyze beta-linked glucans. These enzymes include endoglucanases, cellobiohydrolases, and beta-glucosidases.
Implementation Method 2
Endoglucanases digest the cellulose polymer at random locations, opening it to attack by cellobiohydrolases. Cellobiohydrolases sequentially release molecules of cellobiose from the ends of the cellulose polymer.
Data Source
AI summary
The present invention relates to GH61 polypeptide 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.