Xylanase Polypeptide Variants for Efficient Lignocellulose Saccharification
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Solution Overview
Problem
There is a need for new enzymes that can deconstruct cellulosic or hemicellulosic material more efficiently and provide cost-effective enzyme solutions for saccharification of cellulosic material.
Innovation Solution
The invention provides polypeptides with xylanase activity, encoded by specific polynucleotides, which are used to treat cellulosic or hemicellulosic material, followed by fermentation to produce a fermentation product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional enzymes are used for deconstructing cellulosic or hemicellulosic material, then the process can proceed with existing technology, but the deconstruction efficiency is insufficient and cost-effective enzyme solutions are lacking
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of xylanase enzymes through site-directed mutagenesis, specifically changing residues in the catalytic domain to enhance enzymatic activity and stability, thereby improving deconstruction efficiency while maintaining cost-effectiveness
Solution Approach 2:
The patent creates composite enzymatic systems by combining mutated xylanase variants with other cellulolytic enzymes in optimized formulations, enhancing overall deconstruction efficiency on lignocellulosic substrates while providing cost-effective solutions through improved enzyme performance
2Productivity
If existing xylanase enzymes are used, then the enzyme composition can be simple, but the saccharification efficiency of cellulosic material is insufficient
Solution Approach 1:
The patent modifies enzymatic parameters by altering the amino acid sequence of xylanase to enhance its catalytic activity and stability, achieving improved saccharification efficiency without requiring complex multi-enzyme systems
Solution Approach 2:
The mutated xylanase variants exhibit enhanced multi-functional activity, effectively deconstructing both hemicellulosic xylan and assisting in cellulose saccharification, thereby improving overall saccharification efficiency while maintaining relatively simple enzyme compositions
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 polypeptides enhance the efficiency of deconstructing cellulosic and hemicellulosic materials, facilitating the production of ethanol from lignocellulosic feedstocks through improved saccharification and fermentation processes.
Implementation Method 1
Xylanases (e.g., endo-1,4-beta-xylanase, EC 3.2.1.8) hydrolyze internal β-1,4-xylosidic linkages in xylan to produce smaller molecular weight xylose and xylo-oligomers
Implementation Method 2
Once the cellulose is converted to glucose and the hemicellulose to xylose, the glucose and xylose are fermented by yeast into ethanol
Data Source
Figure 1
AI summary
The present invention relates to isolated polypeptides having xylanase activity, catalytic domains, carbohydrate binding modules and polynucleotides encoding the polypeptides, catalytic domains or carbohydrate binding modules. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides, catalytic domains or carbohydrate binding modules.