Stable Beta-Class Carbonic Anhydrase for CO2 Capture
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Solution Overview
Problem
State-of-the-art carbonic anhydrases are not well-suited for carbon dioxide capture and sequestration due to their lack of stability and activity under conditions such as high temperatures, alkaline pH, and exposure to amine compounds or ammonia, which limits their effectiveness in capturing and releasing carbon dioxide efficiently.
Innovation Solution
Development of recombinant β-class carbonic anhydrase polypeptides with enhanced stability and activity, specifically designed to maintain performance in the presence of amine compounds, ammonia, and varying temperatures, by introducing specific amino acid residues that improve thermostability and solvent stability, allowing for efficient carbon dioxide absorption and desorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If state-of-the-art carbonic anhydrases are used for carbon dioxide capture, then carbon dioxide hydration reaction can be catalyzed, but the enzyme lacks stability and activity under process conditions (high temperatures, alkaline pH, presence of amine compounds or ammonia)
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of carbonic anhydrase through site-directed mutagenesis. Specific residues are mutated to alter the enzyme's physical and chemical properties, enhancing its stability under process conditions (high temperature, alkaline pH, presence of solvents) while maintaining catalytic activity for carbon dioxide capture
Solution Approach 2:
The patent applies local quality by making targeted amino acid substitutions at specific positions in the enzyme structure rather than global modification. The mutations are localized to key regions that influence stability and solvent resistance, allowing the enzyme to maintain activity under challenging conditions while preserving the overall catalytic function
2Productivity
If carbonic anhydrase is exposed to high concentrations of amine compounds or ammonia for extended periods, then carbon dioxide absorption can be enhanced, but the enzyme loses activity due to instability under these conditions
Solution Approach 1:
The patent modifies the enzyme's amino acid sequence parameters to resist deactivation by amine compounds and ammonia. The mutations enhance the enzyme's resistance to inhibition and degradation, allowing it to maintain activity over extended periods (days to weeks) in the presence of high concentrations of these compounds
Solution Approach 2:
The patent applies beforehand cushioning by pre-modifying the enzyme structure through amino acid mutations that protect it from future deactivation. The mutated enzyme is预先 prepared to resist the harmful effects of amine compounds and ammonia, cushioning against activity loss before exposure occurs
3Productivity
If carbonic anhydrase operates at alkaline pH suitable for carbon dioxide hydration, then carbon dioxide capture is efficient, but the enzyme must also withstand acidic pH for subsequent release and recapture
Solution Approach 1:
The patent applies parameter changes by mutating amino acid residues that influence the enzyme's pH stability profile. The modifications broaden the pH tolerance range, allowing the enzyme to maintain structural integrity and catalytic activity across both alkaline conditions (for CO2 capture) and acidic conditions (for CO2 release and recapture)
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 carbonic anhydrase polypeptides exhibit increased stability and activity, enabling effective carbon dioxide capture and sequestration across a range of conditions, including high temperatures and alkaline pH, and reduce inhibition by solvents and flue gas components, thus enhancing the efficiency of carbon capture processes.
Implementation Method 1
The enzyme, carbonic anhydrase ('CA') (EC 4.2.1.1), catalyzes the reversible reactions depicted in Scheme 1: In the forward or 'hydration' reaction, CA combines carbon dioxide and water to provide bicarbonate and a proton
Data Source
AI summary
The present disclosure relates to ß-class carbonic anhydrase polypeptides having improved properties including increased thermostability and/or stability in the presence of amine compounds, ammonia, or carbonate ion. The present disclosure also provides formulations and uses of the polypeptides for accelerating the absorption of carbon dioxide from a gas stream into a solution as well as for the release of the absorbed carbon dioxide for further treatment and/or sequestering. Also provided are polynucleotides encoding the carbonic anhydrase polypeptides and host cells capable of expressing them.