Abstract
Cellulose-degrading auxiliary activity family 9 (AA9) lytic polysaccharide monooxygenases (LPMOs) are known to be widely distributed among filamentous fungi and participate in the degradation of lignocellulose via the oxidative cleavage of celluloses, cello-oligosaccharides, or hemicelluloses. AA9 LPMOs have been reported to have extensive interactions with not only cellulases but also oxidases. The addition of AA9 LPMOs can greatly reduce the amount of cellulase needed for saccharification and increase the yield of glucose. The discovery of AA9 LPMOs has greatly changed our understanding of how fungi degrade cellulose. In this review, apart from summarizing the recent discoveries related to their catalytic reaction, functional diversity, and practical applications, the stability, expression system, and protein engineering of AA9 LPMOs are reviewed for the first time. This review may provide a reference value to further broaden the substrate range of AA9 LPMOs, expand the scope of their practical applications, and realize their customization for industrial utilization.
Key Points |
• The stability and expression system of AA9 LPMOs are reviewed for the first time. |
• The protein engineering of AA9 LPMOs is systematically summarized for the first time. |
• The latest research results on the catalytic mechanism of AA9 LPMOs are summarized. |
• The application of AA9 LPMOs and their relationship with other enzymes are reviewed. |
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References
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I thank Professor Xu Fang and Doctor Fangzhong Wang for helpful discussions.
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Zhang, R. Functional characterization of cellulose-degrading AA9 lytic polysaccharide monooxygenases and their potential exploitation. Appl Microbiol Biotechnol 104, 3229–3243 (2020). https://doi.org/10.1007/s00253-020-10467-5
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DOI: https://doi.org/10.1007/s00253-020-10467-5