AA7-LPMO Enzyme Composition for Controlled Cellulose Oxidation
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Solution Overview
Problem
Current methods for polysaccharide degradation, particularly cellulose, are inefficient due to the indiscriminate consumption of ascorbate as a reductant and the potential oxidative damage caused by unregulated H2O2 supply, limiting the effectiveness of lytic polysaccharide monooxygenases (LPMOs).
Innovation Solution
A composition comprising a lytic polysaccharide monooxygenase enzyme and an auxiliary activity family 7 (AA7) enzyme, specifically designed with unique amino acid sequences, synergistically oxidizes polysaccharides, utilizing dehydrogenase activity to enhance LPMO efficiency and minimize oxidative damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high concentrations of H2O2 are used as co-substrate for LPMO oxidative cleavage, then polysaccharide degradation efficiency is improved, but oxidative damage to the LPMO enzyme increases
Solution Approach 1:
Cellobiose dehydrogenase acts as an intermediary enzyme that mediates electron transfer between cellobiose and LPMO, enabling controlled H2O2 generation at the enzyme active site rather than adding high concentrations of H2O2 directly to the system. This intermediary mechanism provides controlled H2O2 supply that maintains degradation efficiency while protecting LPMO from oxidative damage
Solution Approach 2:
The system uses the substrate itself (cellobiose) to generate the required H2O2 through cellobiose dehydrogenase catalysis, eliminating the need for external H2O2 addition. The substrate serves dual purposes: as electron donor for LPMO activation and as precursor for controlled H2O2 generation,实现ing self-service that balances efficiency and enzyme protection
2Ease of operation
If ascorbate is used as electron donor to prime LPMOs, then LPMO activation is achieved, but ascorbate is consumed indiscriminately and requires continuous supplementation
Solution Approach 1:
The system uses endogenous cellobiose (from polysaccharide degradation) as the electron donor through cellobiose dehydrogenase, eliminating the need for external ascorbate supplementation. The substrate itself provides the reducing equivalents needed for LPMO activation, creating a self-sustaining system that avoids continuous addition of external reductants
Solution Approach 2:
The invention extracts and utilizes the reducing power already present in the system through cellobiose degradation, rather than relying on external ascorbate. By taking out and utilizing endogenous substrates for electron donation, the system eliminates the need for continuous ascorbate supplementation while maintaining LPMO activation
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 synergy between LPMOs and AA7 enzymes significantly enhances polysaccharide degradation, particularly cellulose, by providing direct electron transfer and controlled H2O2 production, outperforming traditional reductants like ascorbate in efficiency and reducing enzyme damage.
Implementation Method 1
The initial step in the LPMO mechanism requires 'activation' by exogenous priming electrons for the reduction of the catalytic Cu(II) to the active Cu(I)-LPMO form
Implementation Method 2
H2O2 has been proposed as a potentially favourable co-substrate during polysaccharide oxidative cleavage by LMPOs
Implementation Method 3
lytic polysaccharide monooxygenases (LPMOs) that uniquely catalyse the oxidative cleavage of glycosidic bonds in semi-crystalline polysaccharides
Data Source
AI summary
The present invention concerns oxidative degradation of polysaccharides, and provides a composition, kit, and method for increasing the efficiency of recalcitrant cellulose degradation, using an auxiliary activity family 7 (AA7) enzymes and a polysaccharide monooxygenase enzyme (E.C. 1.14.99.-). Said AA7 enzyme comprises dehydrogenase activity (E.C. 1.1.1.-) and gluco-oligosaccharide oxidase activity (E.C. 1.1.3.-) and provides a novel “functionality” within a previously not described Glade of AA7 dehydrogenases.