Thermostable Pullulanase Enzyme for Starch Saccharification
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Solution Overview
Problem
Current pullulanase enzymes are limited in their ability to efficiently cleave both alpha-1,6 and alpha-1,4 linkages in pullulan, restricting their industrial applications such as starch saccharification and ethanol production, and lack thermostability, which hampers processing efficiency and yield.
Innovation Solution
Development of a type II pullulanase enzyme with a novel nucleic acid sequence (SEQ ID No.: 1 and 2) that encodes a polypeptide capable of cleaving both alpha-1,6 and alpha-1,4 bonds, exhibiting thermostability up to 75°C, and enhanced activity in starch processing, allowing for increased yields and reduced processing times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current pullulanase enzymes are used, then they can cleave alpha-1,6 linkages in pullulan, but they cannot efficiently cleave alpha-1,4 linkages and lack thermostability
Solution Approach 1:
The patent modifies the amino acid sequence of pullulanase by introducing specific mutations (e.g., substituting residues at positions 135, 225, 315 with amino acids having different properties) to change the enzyme's structural parameters. These parameter changes enable the enzyme to maintain stability at higher temperatures (thermostability up to 75°C) while simultaneously acquiring the ability to cleave both alpha-1,6 and alpha-1,4 linkages in pullulan substrates.
2Productivity
If conventional pullulanase is used in starch processing, then basic saccharification can be achieved, but processing time is extended and yield is reduced
Solution Approach 1:
The engineered pullulanase maintains stable catalytic activity over extended periods at industrial processing temperatures (up to 75°C), enabling continuous efficient saccharification of starch without loss of enzyme activity. This continuity allows for reduced processing times and increased productivity in starch conversion processes, directly addressing the time-loss issue in conventional processes.
Solution Approach 2:
By optimizing the enzyme's temperature stability parameter through amino acid substitutions, the patent enables the pullulanase to operate effectively at higher temperatures (75°C), which accelerates the saccharification reaction rate and reduces processing time while maintaining or improving yield in starch-to-ethanol conversions.
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 novel pullulanase enzyme effectively cleaves both bond types, enhancing starch saccharification and ethanol production, and is thermostable, reducing material retrogradation and processing time, thereby improving industrial efficiency and yield.
Implementation Method 1
Pullulanase will hydrolytically cleave pullulan (alpha-glucan polysaccharides)
Implementation Method 2
Pullulanase is a specific kind of glucanase, an amylolytic exoenzyme, that degrades pullulan
Data Source
AI summary
The present invention relates to thermostable pullulanases useful for industrial and scientific purposes. The present invention provides methods for producing the modified pullulanase, enzymatic compositions comprising the modified pullulanase, and methods for use of the enzymatic compositions.