Thermotolerant Xylanase Variants for High-Temperature Feed Processing
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Solution Overview
Problem
Existing xylanases are not thermotolerant enough to withstand high temperature processes such as pelleting in animal feed and wet milling, leading to loss of enzyme activity and reduced efficiency in industrial applications.
Innovation Solution
Development of xylanases with specific amino acid substitutions, such as S90T, Q105V, Q105I, S114C, S114P, A115S, G48C, and T206C, to enhance thermotolerance, allowing them to maintain residual activity at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional xylanases are used in high temperature processes such as pelleting, then the process can be performed, but the enzyme activity is lost or significantly reduced
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the xylanase enzyme through site-directed mutagenesis. Specific amino acid substitutions (such as S90T, Q105V, Q105I, S114C, S114P, A115S, G48C, and T206C) are introduced to alter the enzyme's thermal stability parameters, enabling it to maintain activity at elevated temperatures up to 95°C that would normally inactivate conventional xylanases.
Solution Approach 2:
The patent creates composite enzyme structures by combining multiple amino acid substitutions within the xylanase protein framework. The variants incorporate combinations of stabilizing mutations (e.g., G48C and T206C disulfide bridge formation, Y123V/S125C/N171C hydrophobic core modifications) to build an enhanced thermotolerant enzyme composite that withstands industrial processing temperatures.
2Productivity
If enzyme components are supplemented in poultry feed to improve digestibility, then feed efficiency is enhanced, but the high temperature pelleting process destroys enzyme activity
Solution Approach 1:
The patent applies preliminary action by pre-modifying the xylanase enzyme through amino acid substitution before it is incorporated into feed. The thermotolerant variants are prepared in advance with enhanced stability, ensuring they can withstand the subsequent pelleting process without losing activity, thereby maintaining their digestive function when administered to poultry.
Solution Approach 2:
The patent changes the physical-chemical parameters of the enzyme by introducing amino acid substitutions that increase thermal stability. These parameter changes in the enzyme structure allow it to survive the high temperature pelleting process (up to 95°C) while retaining its catalytic activity for improving feed digestibility in poultry.
3Productivity
If xylanase is used in wet milling to enhance starch separation, then separation efficiency is improved, but elevated temperatures during processing inactivate the enzyme
Solution Approach 1:
The patent applies parameter changes by modifying the enzyme's thermal stability parameters through amino acid substitutions. The thermotolerant xylanase variants can function at the elevated temperatures used in wet milling processes, maintaining their ability to degrade xylan and release entrapped starch while withstanding the thermal conditions of industrial processing.
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 modified xylanases demonstrate improved thermotolerance, maintaining enzyme activity during high-temperature processes, enhancing feed digestibility, starch separation, and ethanol yield, while reducing energy consumption and production costs.
Implementation Method 1
Xylanase is an important enzyme involved in the breakdown of xylan, a non-starch polysaccharide (NSP) component of plant cell walls
Implementation Method 2
Xylanase enzymes are produced by a variety of bacteria, protozoa, fungi, algae, insects, terrestrial plants and germinating seeds
Data Source
AI summary
A thermotolerant xylanase enzyme that is a variant of SEQ ID NO:2, wherein the variant comprises at least one amino acid substitution at a position selected from the group consisting of 90, 105, 114, and 115 and/or comprises any of the following sets of substitutions:(a) G48C and T206C;(b) Y123V, S125C and N171C;(c) S114C, Y123V, S125C and N171C;(d) Y123V, S125C, N171C, G48C and T206C;(e) S114C, Y123V, S125C, N171C, G48C and T206C;wherein the substitution or substitutions increases the thermotolerance of the xylanase relative to a parent xylanase lacking the substitution(s)