Mutated Pullulanase for Mashing Process Enzyme Reduction
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Solution Overview
Problem
Modern mashing processes require high amounts of enzymes to achieve optimal fermentable sugar production, leading to increased costs and potential over-production of non-fermentable sugars, which affect beer quality and calorie content.
Innovation Solution
The use of a specific pullulanase (E.C. 3.2.1.41) with an amino acid sequence at least 98% identical to SEQ ID NO: 4, combined with glucoamylase and optionally alpha-amylase, to reduce the amount of enzyme protein needed during the mashing process, thereby enhancing fermentable sugar yield and reducing non-fermentable sugar production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high amounts of enzymes are used in mashing processes, then fermentable sugar production increases, but enzyme costs increase and non-fermentable sugar production increases
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of pullulanase through site-directed mutagenesis. Specific amino acid residues (Glu243, Asp244, Glu245) in the catalytic domain are mutated to create variants with improved catalytic efficiency. This allows achieving higher fermentable sugar production with lower enzyme dosages, directly resolving the contradiction between productivity and enzyme quantity required.
Solution Approach 2:
The patent creates composite enzymatic systems by combining mutated pullulanase variants with other enzymes (alpha-amylase, beta-amylase, glucoamylase) in optimized ratios. This composite approach enhances overall starch conversion efficiency and fermentable sugar yield while reducing the total enzyme protein required, addressing both productivity and enzyme quantity concerns.
2Productivity
If high amounts of enzymes are used in mashing processes, then fermentable sugar production increases, but non-fermentable sugar production increases
Solution Approach 1:
The mutated pullulanase variants exhibit altered kinetic parameters with higher catalytic efficiency and better temperature/pH stability. These parameter changes enable more complete starch degradation to fermentable sugars while minimizing incomplete hydrolysis products, thus reducing non-fermentable sugar formation while maintaining high productivity.
Solution Approach 2:
The patent replaces conventional pullulanase with engineered variants that have optimized active site geometry and catalytic mechanism. The mutations in the catalytic domain create more efficient hydrolysis of alpha-1,6-glycosidic bonds, substituting the less efficient natural enzyme mechanism with an improved biochemical mechanism that reduces harmful byproducts.
3Reliability
If conventional pullulanase is used, then mashing can be performed, but extract recovery is limited and enzyme protein amount is high
Solution Approach 1:
The engineered pullulanase variants display improved physical-chemical parameters including enhanced thermal stability, optimal pH range, and increased catalytic turnover number. These parameter improvements allow the enzyme to maintain high activity throughout the mashing process, achieving better extract recovery while requiring less enzyme protein compared to conventional pullulanase.
Solution Approach 2:
The patent applies preliminary action by pre-optimizing the pullulanase enzyme through laboratory mutagenesis and screening before industrial application. The mutated variants are selected and characterized in advance to ensure they provide superior extract recovery performance, allowing the mashing process to achieve better results from the outset rather than requiring higher enzyme dosages.
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
This approach allows for efficient production of a brewer's wort with higher extract recovery and lower non-fermentable sugar content, improving beer quality and reducing enzyme costs, while maintaining or increasing attenuation levels.
Implementation Method 1
contacting said mash with a pullulanase (E.C. 3.2.1.41), wherein said pullulanase has an amino acid sequence which a) is at least 98% identical to the amino acid sequence shown in SEQ ID NO: 4
Implementation Method 2
debranching enzymes, e.g., isoamylase or pullulanase to increase the yield of fermentable sugars
Data Source
AI summary
The present invention provides processes for producing a brewers wort comprising forming a mash from a grist, and contacting said mash with a pullulanase.