Xylanase Variants With Position-2 Substitutions for Branched Xylan
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Solution Overview
Problem
Existing xylanases are ineffective in degrading the highly branched xylan backbone in corn and sorghum, which are commonly used in animal feed, leading to poor nutrient release and digestibility.
Innovation Solution
Development of xylanase variants with specific substitutions at position 2, such as A2D, A2Q, A2G, A2W, or A2P, achieving at least 90-99% sequence identity to SEQ ID NO: 1, enhancing thermostability and improving the enzyme's ability to break down highly branched xylans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional xylanases are used to degrade xylans in corn and sorghum, then the enzyme structure and function are maintained, but the degradation effectiveness is poor due to high side chain substitution
Solution Approach 1:
The patent applies local quality by introducing specific amino acid substitutions at position 2 (A2D, A2Q, A2G, A2W, or A2P) of the xylanase enzyme sequence. This localized modification at a specific position changes the enzyme's interaction properties with highly substituted xylans, enabling effective degradation of corn and sorghum xylans while maintaining overall enzyme structure and function.
2Reliability
If xylanase variants with substitutions at position 2 are introduced, then the ability to degrade highly branched xylans is improved, but the sequence identity deviates from the wild-type sequence
Solution Approach 1:
The patent applies parameter changes by systematically varying the amino acid at position 2 of the xylanase sequence. By changing this single parameter (position 2) to specific alternatives (D, Q, G, W, or P), the enzyme gains improved degradation capability against highly substituted xylans while maintaining high overall sequence identity (at least 90% identity to SEQ ID NO: 1) and acceptable thermostability.
3Reliability
If the enzyme structure is modified to improve substrate breakdown, then the catalytic activity is enhanced, but the thermostability may be compromised
Solution Approach 1:
The patent applies partial action by introducing limited, specific amino acid substitutions (only at position 2) rather than extensive modifications throughout the enzyme sequence. This restrained approach allows the enzyme to gain improved catalytic activity against highly substituted xylans while minimizing disruptions to the overall structural framework that maintains thermostability, achieving a balance between enhanced function and structural stability.
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 xylanase variants effectively degrade highly branched xylans in corn and sorghum, enhancing nutrient release and digestibility, thereby improving animal feed quality and efficiency.
Implementation Method 1
The known enzymes responsible for the hydrolysis of the xylan backbone are classified into enzyme families
Data Source
AI summary
The present invention relates to xylanase variants, polynucleotides encoding the variants; nucleic acid constructs, vectors, and host cells comprising the polynucleotides; compositions comprising the xylanase variants and methods of using the variants.