Cellulase Crystallization via pH and PEG
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Solution Overview
Problem
Industrial enzyme purification and concentration are impractical due to high costs and low yield, especially for cellulases with cellulose binding moieties (CBM), as existing methods require extensive empirical work and are not economically or environmentally viable, and crystallization attempts often fail, resulting in low enzyme activity and difficult-to-process suspensions.
Innovation Solution
A method involving adjusting the pH of cellulase in spent fermentation broth to a range of 3-6 and adding low concentrations of polyethylene glycol (PEG) to precipitate cellulase in a solid phase, allowing for high-yield harvesting and subsequent crystallization, which can include the use of filtration or centrifugation for easy handling and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional purification and concentration methods are used for cellulases, then enzyme purity can be improved, but the process becomes impractical due to high costs and low yield
Solution Approach 1:
The invention changes the pH parameter to a specific range (pH 3-6) where cellulases with CBM exhibit reduced solubility and precipitate. This parameter change enables direct precipitation of pure cellulase from fermentation broth without traditional purification steps, resolving the contradiction between achieving high purity and maintaining process efficiency.
2Quantity of substance
If high salt concentration is used for enzyme crystallization, then crystallization yield can be improved, but environmental load and chemical cost increase
Solution Approach 1:
The invention changes the crystallization parameter from high salt concentration to low salt concentration combined with specific pH conditions (pH 3-6). This parameter change achieves high crystallization yield while avoiding the environmental and economic drawbacks of high salt usage.
3Quantity of substance
If crystallization attempts are made for cellulases with CBM, then high concentration enzyme preparation can be obtained, but the process fails due to unfavorable crystallization kinetics
Solution Approach 1:
The invention changes the crystallization parameters by combining specific pH conditions (pH 3-6) with low salt concentrations and optionally adding PEG. This parameter combination overcomes the unfavorable crystallization kinetics of cellulases with CBM, enabling reliable crystallization and high concentration enzyme preparation.
4Reliability
If extensive empirical work is performed to optimize crystallization conditions, then crystallization success can be improved, but time and resource consumption increase
Solution Approach 1:
The invention performs preliminary action by identifying and applying the specific pH range (pH 3-6) where cellulases with CBM naturally precipitate. This preliminary identification of optimal conditions eliminates the need for extensive empirical optimization work, achieving both high crystallization success and time efficiency.
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 method achieves high-purity, high-concentration cellulase crystals with improved stability and activity, reducing the need for separate purification and concentration steps, enabling efficient cellulose hydrolysis and easier handling compared to traditional methods, while avoiding the use of high salt concentrations.
Implementation Method 1
controlling cellulase solubility by adjusting the pH value to a pH value selected between pH 3 and 6, to provide the cellulase in a solid phase
Implementation Method 2
adding polyethylene glycol to increase the amount of cellulase in the solid phase
Implementation Method 3
harvesting the cellulase from the solid phase
Implementation Method 4
which can include the use of filtration or centrifugation for easy handling and storage
Data Source
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AI summary
The present description is related to the field of producing industrial enzymes. It discloses a method of crystallizing cellulases and compositions comprising highly pure and concentrated cellulase, as well as uses thereof.