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. 2020 Feb 7;11:145. doi: 10.3389/fmicb.2020.00145

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Copyright © 2020 Lin, Zhao, Zhang, Cui, Fan, Chen and Tian.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Model of cellulose utilization in A. niger by both complete and partial hydrolysis strategies. In both strategies, cellulose is first transformed into cellobiose and cellodextrins by endoglucanase (EG) and exo-cellobiohydrolases (CBHI and CBHII). In the complete hydrolysis strategy, extracellular β-glucosidase (BGL) hydrolyzes the cellobiose and cellodextrins into glucose and then it is transferred into the cells by monosaccharide transporter (MST). However, the cellobiose and cellodextrins are transferred into the cells by cellodextrin transporter (CtA) and then they are hydrolyzed into glucose by intracellular BGL in the partial hydrolysis strategy.