SS-BGL Mutant Engineering for High-Temperature Ginsenoside CK Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The stability of the wild-type β-glycosidase SS-BGL enzyme decreases rapidly above its optimal temperature, limiting its industrial application in the production of the anti-cancer compound ginsenoside CK.
Innovation Solution
A β-glycosidase SS-BGL mutant is developed by mutating specific amino acids (N128 and N302) to aspartic acid and introducing additional mutations (Q96E and N97D) to enhance thermal stability, resulting in improved enzyme activity at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wild-type β-glycosidase SS-BGL is used for ginsenoside modification, then the enzyme shows efficient catalytic activity at optimal temperature (85°C), but the enzyme stability rapidly decreases above optimal temperature, limiting further application
Solution Approach 1:
The patent applies parameter changes by mutating specific amino acid residues (N128D, N302D, Q96E, N97D) to alter the enzyme's thermal stability parameters. These point mutations change the local chemical environment and bonding characteristics, allowing the enzyme to maintain stability at higher temperatures while preserving catalytic function, thus resolving the contradiction between stability and productivity at elevated temperatures
2Speed
If temperature is increased to enhance reaction rate, then the reaction rate increases, but the enzyme stability rapidly decreases
Solution Approach 1:
Through site-directed mutagenesis introducing amino acid substitutions (N128D, N302D, Q96E, N97D), the patent changes the thermal parameters of the enzyme structure. These mutations enhance the enzyme's resistance to thermal denaturation, allowing it to operate at higher temperatures where reaction rates are faster without suffering from rapid stability loss, thus simultaneously improving speed and reliability
3Reliability
If multiple amino acid mutations are introduced to enhance thermal stability, then the melting temperature increases by up to 14.27°C, but the enzyme structure complexity increases
Solution Approach 1:
The patent applies local quality by introducing mutations at specific, strategically chosen positions (N128, N302, Q96, N97) rather than throughout the entire enzyme structure. This localized approach to structural modification achieves enhanced thermal stability through targeted changes in key regions, minimizing overall structural complexity while maximizing the stability benefit
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 mutant enzymes exhibit significantly enhanced thermal stability and saponin conversion activity, with melting temperatures increased by up to 14.27°C and residual enzyme activity retention at 95°C improved by 115.95%, facilitating efficient production of ginsenoside CK.
Implementation Method 1
A structural modification of the ginsenoside mainly involves in hydrolysis of glycosyl at a specific site. Glycosidase is one of the most common industrial enzymes, which is responsible for hydrolysis and cleavage of glycosidic bonds
Implementation Method 2
β-glycosidase (SS-BGL with the amino acid sequence as shown in SEQ ID NO: 1) from thermophilic archaea Sulfolobus solfataricus has been confirmed to be an efficient CK producing enzyme using glycosylated protopanaxadiol (PPD) type ginsenosides as substrates
Data Source
AI summary
A β-glycosidase SS-BGL mutant for modifying ginsenoside and an application thereof are provided, which relate to the field of genetic engineering technologies. The β-glycosidase SS-BGL mutant is a mutant mutating asparagines at 128th position and 302th position of the amino acid sequence as shown in SEQ ID NO: 1 of β-glycosidase SS-BGL into aspartic acids respectively. The β-glucosidase SS-BGL mutant improves the thermal stability of the natural β-glucosidase SS-BGL at extremely high temperature, and is more conducive to the application of SS-BGL in ginsenoside preparation.