Thermostable Xylanase Polypeptide for Lignocellulose Hydrolysis
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Solution Overview
Problem
Current enzymatic hydrolysis processes for biofuel production from lignocellulose biomass face challenges due to heat inactivation of enzymes, particularly xylanase, which is crucial for degrading the abundant hemicellulose fraction in biomass, limiting industrial feasibility.
Innovation Solution
An isolated polypeptide with a specific amino acid sequence and its encoding polynucleotide are provided, which can be expressed in recombinant host cells to enhance thermo-active and thermostable xylanase activity, enabling efficient degradation of lignocellulose biomass at higher temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrolysis is conducted at temperatures above 55°C to increase product solubility and reduce viscosity, then process efficiency improves, but enzyme performance deteriorates due to heat inactivation
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the xylanase enzyme to alter its thermal stability properties. Specifically, the enzyme has been engineered with increased thermostability allowing it to maintain activity at temperatures above 55°C, thus resolving the contradiction between process efficiency and enzyme performance
Solution Approach 2:
The patent creates a composite enzymatic system by combining xylanase with other cellulolytic enzymes. This composite approach enhances overall system stability and performance at elevated temperatures, allowing the enzyme mixture to function effectively where individual enzymes would fail
2Ease of manufacture
If conventional xylanase enzymes are used, then the process is simple and cost-effective, but enzyme performance is reduced due to heat inactivation at industrial hydrolysis temperatures
Solution Approach 1:
The patent modifies physical parameters of the xylanase enzyme through protein engineering to enhance thermostability. The engineered enzyme maintains catalytic activity at industrial hydrolysis temperatures (above 55°C), resolving the contradiction between ease of manufacture and enzyme performance reliability
3Reliability
If hydrolysis is conducted at lower temperatures to maintain enzyme activity, then enzyme performance is preserved, but product solubility decreases and process liquid viscosity increases
Solution Approach 1:
The patent changes the thermal stability parameters of the xylanase enzyme through amino acid sequence modification. This allows the enzyme to maintain high activity at elevated temperatures, thus simultaneously achieving both preserved enzyme performance and improved process efficiency through better product solubility and reduced viscosity
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 solution improves enzyme performance and feasibility of industrial-scale biofuel production by maintaining xylanase activity at elevated temperatures, facilitating higher substrate loadings and reduced process liquid viscosity.
Implementation Method 1
The process involves a number of steps including enzymatic hydrolysis of the cellulose and hemicellulose components of the lignocellulose biomass in order to release sugars for subsequent fermentation
Data Source
AI summary
The present invention relates to an isolated polypeptide having xylanase activity. Also disclosed are isolated polynucleotides encoding the polypeptide, recombinant host cells expressing the polypeptide, and methods for degrading lignocellulosic biomass using the polypeptide. He invention finds utility in the production of biofuels, in the paper and pulp industry, in clothing or leather softening, in the food industry such as baking, etc.