Recombinant Cellulase Thermostability via Cys to Ser Mutation
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Solution Overview
Problem
Current cellulase mixtures for biomass conversion processes lack enzymes with sufficient thermostability and activity to efficiently hydrolyze cellulose at varying temperatures and conditions, limiting their effectiveness in biomass conversion.
Innovation Solution
Development of recombinant polypeptides with a Cys to Ser mutation at specific positions, such as C314S, which enhance thermostability and cellulase activity, allowing for improved hydrolysis of solid cellulose in long-time assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If wild-type cellulase enzymes are used, then the enzyme formulation has basic cellulase activity, but the thermostability and activity at elevated temperatures are insufficient
Solution Approach 1:
The patent applies parameter changes by introducing specific amino acid substitutions (Cys to Ser mutations at positions 310, 311, 312, 313, or 314) in the cellulase enzyme sequence. These parameter changes at the molecular level alter the enzyme's thermal stability properties, enabling it to maintain activity at elevated temperatures while resolving the contradiction between thermostability and activity consistency.
2Productivity
If native cellulase enzymes are used, then the enzyme can hydrolyze cellulose, but the hydrolysis efficiency of solid cellulose in long-time assays is limited
Solution Approach 1:
The patent improves productivity and duration of action by changing the amino acid sequence parameters through Cys to Ser mutations. These parameter changes enhance the enzyme's ability to hydrolyze solid cellulose efficiently over extended periods, as demonstrated in long-time hydrolysis assays where the mutant enzymes outperformed native enzymes.
3Adaptability or versatility
If diverse cellulases are not used, then the enzyme formulation is simpler, but optimization for different applications and feedstocks is limited
Solution Approach 1:
The patent applies universality by creating mutant cellulase enzymes with improved thermostability and activity that can serve multiple applications and work with different feedstocks. The Cys to Ser mutations produce enzymes with enhanced performance characteristics that make them versatile for various biomass conversion processes, reducing the need for highly specialized enzyme formulations.
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 recombinant polypeptides demonstrate increased thermostability and cellulase activity compared to wild-type enzymes, effectively hydrolyzing solid cellulose at elevated temperatures and maintaining activity over extended periods.
Implementation Method 1
CBHII chimeras and the native enzymes having a Cys to Ser mutation at the C-terminal end hydrolyze more solid cellulose than the native enzyme
Implementation Method 2
cellulose hydrolysis
Data Source
AI summary
The present disclosure relates to CBH II chimera fusion polypeptides, nucleic acids encoding the polypeptides, and host cells for producing the polypeptides.