Revisiting the Phenomenon of Cellulase Action: Not All Endo- and Exo-Cellulase Interactions are Synergistic
| Autor: | Mpho S. Mafa, Samkelo Malgas, Mariska Thoresen, Brett I. Pletschke |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
synergy
Cellulose hydrolysis Cellulase lcsh:Chemical technology Catalysis lcsh:Chemistry 03 medical and health sciences chemistry.chemical_compound endo-glucanase Enzymatic hydrolysis Glycoside hydrolase glycoside hydrolase lcsh:TP1-1185 Physical and Theoretical Chemistry Cellulose 030304 developmental biology 0303 health sciences biology 030306 microbiology Chemistry A protein enzymatic hydrolysis cellulose Biochemistry lcsh:QD1-999 Biomass degradation biology.protein exo-glucanase |
| Zdroj: | Catalysts, Vol 11, Iss 170, p 170 (2021) Catalysts Volume 11 Issue 2 |
| ISSN: | 2073-4344 |
| Popis: | The conventional endo–exo synergism model has extensively been supported in literature, which is based on the perception that endoglucanases (EGs) expose or create accessible sites on the cellulose chain to facilitate the action of processive cellobiohydrolases (CBHs). However, there is a lack of information on why some bacterial and fungal CBHs and EGs do not exhibit synergism. Therefore, the present study evaluated and compared the synergistic relationships between cellulases from different microbial sources and provided insights into how different GH families govern synergism. The results showed that CmixA2 (a mixture of TlCel7A and CtCel5A) displayed the highest effect with BaCel5A (degree of synergy for reducing sugars and glucose of 1.47 and 1.41, respectively) in a protein mass ratio of 75–25%. No synergism was detected between CmixB1/B2 (as well as CmixC1/C2) and any of the EGs, and the combinations did not improve the overall cellulose hydrolysis. These findings further support the hypothesis that “not all endo-to exo-cellulase interactions are synergistic”, and that the extent of synergism is dependent on the composition of cellulase systems from various sources and their compatibility in the cellulase cocktail. This method of screening for maximal compatibility between exo- and endo-cellulases constitutes a critical step towards the design of improved synergistic cellulose-degrading cocktails for industrial-scale biomass degradation. |
| Databáze: | OpenAIRE |
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