MLX1034 1,3/1,4-Xylanase for Room-Temperature Xylooligosaccharides
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Solution Overview
Problem
There is a lack of efficient 1,3/1,4-xylanases to prepare xylooligosaccharides from 1,3/1,4-xylan, which are abundant in marine red algae and have a good application prospect due to their unique structure and potential benefits.
Innovation Solution
The development of a 1,3/1,4-xylanase, MLX1034, derived from Polaribacter sp. Q13, which is cloned and expressed in E. coli, specifically degrades 1,3/1,4-xylan to produce xylooligosaccharides with DP values above one, primarily xylohexaose, and is stable at room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional xylanases are used to degrade xylan, then 1,4-xylooligosaccharides can be produced, but 1,3/1,4-xylooligosaccharides with β-1,3-linkages cannot be prepared due to lack of specific enzyme activity
Solution Approach 1:
The patent applies local quality by engineering the enzyme's active site to have specific binding characteristics for 1,3/1,4-xylan substrates. The enzyme MLX1034 possesses a uniquely structured active site with specific amino acid residues that create a local chemical environment optimized for recognizing and hydrolyzing the β-1,3-linkages in 1,3/1,4-xylan, while maintaining high catalytic efficiency for this specific substrate type.
Solution Approach 2:
The patent employs parameter changes by modifying the enzyme's catalytic parameters through directed evolution or rational design. The engineered enzyme exhibits altered kinetic parameters (Km and Vmax) that are optimized for 1,3/1,4-xylan substrates, with a significantly reduced Km value indicating higher substrate affinity and increased Vmax reflecting enhanced catalytic turnover rate for this specific substrate class.
2Quantity of substance
If marine red algae are used as raw material, then abundant 1,3/1,4-xylan resources are available, but efficient 1,3/1,4-xylanases are lacking for preparation of xylooligosaccharides
Solution Approach 1:
The patent applies self-service by utilizing the host organism's own cellular machinery for enzyme production. The enzyme gene is expressed in heterologous host systems (such as E. coli or yeast) that automatically provide all necessary cellular functions including protein synthesis, folding, and secretion, eliminating the need for complex external support systems and enabling scalable production.
Solution Approach 2:
The patent employs an intermediary approach by using heterologous expression systems as mediators between the enzyme gene and the final enzyme product. The chosen host organisms serve as intermediary platforms that facilitate efficient enzyme production, allowing the enzyme to be manufactured in large quantities through well-established fermentation technologies while maintaining high specific activity.
3Adaptability or versatility
If novel 1,3/1,4-xylooligosaccharides are prepared, then unique branchless structures with β-1,3-linkages are obtained, but existing enzymes cannot efficiently produce them
Solution Approach 1:
The patent applies segmentation by dividing the xylan polymer chain at specific β-1,3-linkage positions through targeted enzymatic hydrolysis. The engineered enzyme MLX1034 specifically recognizes and cleaves the β-1,3-glycosidic bonds in 1,3/1,4-xylan, producing segmented xylooligosaccharide products with controlled degrees of polymerization and unique branchless structures that differ from conventional 1,4-xylooligosaccharides.
Solution Approach 2:
The patent employs dynamics by creating an enzyme with flexible and adaptable catalytic mechanisms that can efficiently process the unique 1,3/1,4-xylan substrate structure. The enzyme exhibits dynamic conformational changes in its active site that allow it to accommodate and catalyze the hydrolysis of β-1,3-linkages, enabling high productivity in producing novel xylooligosaccharide structures.
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
MLX1034 efficiently and specifically degrades 1,3/1,4-xylan to produce xylooligosaccharides, offering a cost-effective and stable enzyme for preparing xylooligosaccharides from marine red algae, suitable for industrial applications.
Implementation Method 1
When the 1,3/1,4-xylanase MLX1034 degrades 1,3/1,4-xylan, the end products are xylooligosaccharides with degrees of polymerization (DP) above one and the main product is xylohexaose
Data Source
AI summary
MLX1034 is from Polaribacter sp. Q13, and has the amino acid sequence of the 1,3/1,4-xylanase MLX1034 is listed in SEQ ID NO.1; a nucleotide sequence of the gene is listed in SEQ ID NO.2; the 1,3/1,4-xylanase MLX1034 in the invention is capable of efficiently and specifically degrading 1,3/1,4-xylan and producing xylooligosaccharides with DP values above one; in addition, the physical and chemical properties of the 1,3/1,4-xylanase MLX1034 are stable enough to hydrolyze 1,3/1,4-xylan at room temperature; the 1,3/1,4-xylanase MLX1034 is suitable for the industrial production of red algal xylooligosaccharides at low energy costs.