Constitutive overexpression of cellobiohydrolase 2 in Trichoderma reesei reveals its ability to initiate cellulose degradation
Cellulose degradation results from the synergistic effect of different enzymes, but which enzyme is involved in the initial stage of cellulose degradation is still not well understood. Cellobiohydrolase 2 (CBH2) attached to the conidial surface is possibly associated with the initial stage. However,...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Engineering Microbiology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667370322000509 |
| _version_ | 1797788421266079744 |
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| author | Yubo Wang Meibin Ren Yifan Wang Lu Wang Hong Liu Mei Shi Yaohua Zhong |
| author_facet | Yubo Wang Meibin Ren Yifan Wang Lu Wang Hong Liu Mei Shi Yaohua Zhong |
| author_sort | Yubo Wang |
| collection | DOAJ |
| description | Cellulose degradation results from the synergistic effect of different enzymes, but which enzyme is involved in the initial stage of cellulose degradation is still not well understood. Cellobiohydrolase 2 (CBH2) attached to the conidial surface is possibly associated with the initial stage. However, its specific mechanism is still incompletely known. This study explored the potential role of CBH2 in initiating cellulose degradation using a constitutive overexpression strategy. First, the CBH2-overexpression Trichoderma reesei strains Qgc2–5 and Qrc2–40 were constructed using the constitutive promoters Pgpd1 and PrpS30, respectively. It was found that cbh2 was expressed at a high level under the glucose conditions and was significantly higher than that of the parental strain QM9414 at the early stage of 29 h when cellulose was used as the carbon source. Particularly, the constitutive overexpression of cbh2 caused the strong expression of major cellulase-encoding genes (cbh1, eg1, and eg2) and the rapid decomposition of cellulosic material. Meanwhile, the scanning electron microscope showed that the groove-like structure of the cellulose surface was eroded seriously owing to CBH2 overexpression, which caused the cellulose surface to be smooth. These results showed that the overexpression of CHB2 caused the major cellulase enzymes to be expressed and contributed to cellulose degradation, showing the potential role of CBH2 in the initial stage of the cellulose hydrolytic process. |
| first_indexed | 2024-03-13T01:36:19Z |
| format | Article |
| id | doaj.art-de79ae23d1b141f391506c68273abfa3 |
| institution | Directory Open Access Journal |
| issn | 2667-3703 |
| language | English |
| last_indexed | 2024-03-13T01:36:19Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Engineering Microbiology |
| spelling | doaj.art-de79ae23d1b141f391506c68273abfa32023-07-04T05:11:26ZengElsevierEngineering Microbiology2667-37032023-03-0131100059Constitutive overexpression of cellobiohydrolase 2 in Trichoderma reesei reveals its ability to initiate cellulose degradationYubo Wang0Meibin Ren1Yifan Wang2Lu Wang3Hong Liu4Mei Shi5Yaohua Zhong6State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, ChinaSchool of Medicine, Henan Polytechnic University, Jiaozuo, Henan 454003, ChinaState Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, ChinaState Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, ChinaState Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, ChinaState Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, China; Correspondence authors.State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, China; Correspondence authors.Cellulose degradation results from the synergistic effect of different enzymes, but which enzyme is involved in the initial stage of cellulose degradation is still not well understood. Cellobiohydrolase 2 (CBH2) attached to the conidial surface is possibly associated with the initial stage. However, its specific mechanism is still incompletely known. This study explored the potential role of CBH2 in initiating cellulose degradation using a constitutive overexpression strategy. First, the CBH2-overexpression Trichoderma reesei strains Qgc2–5 and Qrc2–40 were constructed using the constitutive promoters Pgpd1 and PrpS30, respectively. It was found that cbh2 was expressed at a high level under the glucose conditions and was significantly higher than that of the parental strain QM9414 at the early stage of 29 h when cellulose was used as the carbon source. Particularly, the constitutive overexpression of cbh2 caused the strong expression of major cellulase-encoding genes (cbh1, eg1, and eg2) and the rapid decomposition of cellulosic material. Meanwhile, the scanning electron microscope showed that the groove-like structure of the cellulose surface was eroded seriously owing to CBH2 overexpression, which caused the cellulose surface to be smooth. These results showed that the overexpression of CHB2 caused the major cellulase enzymes to be expressed and contributed to cellulose degradation, showing the potential role of CBH2 in the initial stage of the cellulose hydrolytic process.http://www.sciencedirect.com/science/article/pii/S2667370322000509Trichoderma reeseiCellobiohydrolase 2Constitutive overexpressionCellulose degradationCellulase induction |
| spellingShingle | Yubo Wang Meibin Ren Yifan Wang Lu Wang Hong Liu Mei Shi Yaohua Zhong Constitutive overexpression of cellobiohydrolase 2 in Trichoderma reesei reveals its ability to initiate cellulose degradation Engineering Microbiology Trichoderma reesei Cellobiohydrolase 2 Constitutive overexpression Cellulose degradation Cellulase induction |
| title | Constitutive overexpression of cellobiohydrolase 2 in Trichoderma reesei reveals its ability to initiate cellulose degradation |
| title_full | Constitutive overexpression of cellobiohydrolase 2 in Trichoderma reesei reveals its ability to initiate cellulose degradation |
| title_fullStr | Constitutive overexpression of cellobiohydrolase 2 in Trichoderma reesei reveals its ability to initiate cellulose degradation |
| title_full_unstemmed | Constitutive overexpression of cellobiohydrolase 2 in Trichoderma reesei reveals its ability to initiate cellulose degradation |
| title_short | Constitutive overexpression of cellobiohydrolase 2 in Trichoderma reesei reveals its ability to initiate cellulose degradation |
| title_sort | constitutive overexpression of cellobiohydrolase 2 in trichoderma reesei reveals its ability to initiate cellulose degradation |
| topic | Trichoderma reesei Cellobiohydrolase 2 Constitutive overexpression Cellulose degradation Cellulase induction |
| url | http://www.sciencedirect.com/science/article/pii/S2667370322000509 |
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