Mannanase Variants for Fermentation Stability and Higher Enzyme Yield
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Solution Overview
Problem
Existing mannanase enzymes exhibit insufficient activity and stability under industrial application conditions, leading to inadequate yield and performance in processes such as feed digestibility, coffee viscosity reduction, and biofilm removal.
Innovation Solution
Development of mannanase variants with improved stability during fermentation, achieving higher yields and enzymatic activity by introducing specific amino acid substitutions, such as N341F, F346T, T348S/R/N/M/G, E349T/S/G/D, S352N/G, G356Y/V/T/Q/H/C, and D379V, resulting in mannanase variants at least 75% identical to SEQ ID NO: 2 or SEQ ID NO: 3.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing mannanase enzymes are used under industrial application conditions, then the enzymatic activity is insufficient, but increasing the enzyme concentration does not resolve the stability issue during fermentation
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the mannanase enzyme through site-directed mutagenesis. Specific amino acid residues were changed (e.g., E349T, E349D, G356Y, G356V, G356T, G356Q, G356H, G356C) to alter the enzyme's stability parameters during fermentation while maintaining or improving its catalytic activity. This molecular-level parameter change resolved the contradiction between insufficient enzymatic activity and low enzyme yield.
2Productivity
If mannanase is produced through fermentation, then the enzyme degrades during the process, but stabilizing the enzyme requires complex formulation
Solution Approach 1:
The patent implements self-service by engineering the mannanase enzyme to be self-stabilizing through intrinsic amino acid modifications. The mutated enzyme variants (e.g., E349T, G356Y) possess enhanced stability properties that allow them to resist degradation during fermentation without requiring external stabilizing agents or complex formulation systems. The enzyme stabilizes itself through its modified structure.
3Stability of the object's composition
If amino acid substitutions are introduced to improve stability, then fermentation stability increases, but the enzyme structure becomes more complex
Solution Approach 1:
The patent applies local quality by introducing amino acid substitutions at specific, localized positions within the enzyme structure rather than throughout the entire molecule. The mutations are targeted at particular residues (e.g., position 349, 356, 379) that are critical for stability, while leaving the rest of the enzyme structure unchanged. This localized modification approach improves fermentation stability without substantially increasing overall structural complexity.
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 improved mannanase variants demonstrate enhanced fermentation stability, increasing enzyme yield and performance in industrial applications by at least 1.5-fold compared to parent enzymes.
Implementation Method 1
The two major endo-acting enzymes involved in degradation of hemicelluloses are beta-mannanase and beta-xylanase. Endo-1,4-beta-mannanases (EC 3.2.1.78), which hydrolyze the internal glycoside bonds in the mannan backbone.
Data Source
AI summary
A mannanase at least 75% identical to SEQ ID NO: 2 or SEQ ID NO: 3, a polynucleotide encoding the mannanase, an expression construct comprising the polynucleotide, and a host cell comprising the polynucleotide or the expression construct.