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Published on: June 13, 2014
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Dissecting Cellular Function and Distribution of β-Glucosidases in Trichoderma reesei
Ai-Ping Pang1, Haiyan Wang1, Yongsheng Luo1
1State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China.
Mbio
|May 12, 2021
Summary
This study investigated the roles of multiple beta-glucosidases in Trichoderma reesei cellulase production. Overexpressing cel3b or cel3g enhanced enzyme production, while cel1b inhibited it, revealing distinct functions and cellular distributions for these key enzymes.
Area of Science:
- Biochemistry and Molecular Biology
- Mycology
- Enzymology
Background:
- Trichoderma reesei possesses 11 putative beta-glucosidases, crucial for cellulase induction and production.
- The specific functions and cellular roles of individual beta-glucosidases in T. reesei remain largely uncharacterized.
Purpose of the Study:
- To explore the cellular function and distribution of 10 known beta-glucosidases in T. reesei.
- To elucidate the distinct roles of beta-glucosidases in cellulase production and secretion pathways.
Main Methods:
- Investigated cellular distribution and function of 10 beta-glucosidases (excluding BGL1/CEL3A).
- Analyzed effects of gene overexpression (cel3b, cel3g, cel1b) on beta-glucosidase and cellulase production.
- Determined secretion pathways (conventional, vacuole-mediated, unconventional) for various beta-glucosidases.
Main Results:
- Overexpression of cel3b or cel3g enhanced extracellular beta-glucosidase production; cel1b overexpression severely inhibited cellulase production.
- Identified four cellular distribution patterns: cytoplasmic vesicles, endomembrane/cell membrane network, vacuoles, and nucleus (CEL3C).
- Characterized distinct secretion pathways: conventional (CEL3B, E, F, H, G), vacuole-mediated without signal peptide (CEL1A), and unconventional (CEL3J).
Conclusions:
- This study provides a comprehensive view of beta-glucosidase function, distribution, and secretion in T. reesei.
- Specific beta-glucosidases have distinct roles in cellulase production, with CEL3C localized to the nucleus and CEL3J utilizing unconventional secretion.
- Findings advance understanding of beta-glucosidase properties and secretory pathways in filamentous fungi, offering insights for future research and applications.
