Engineering the Linker Region of Cellobiohydrolase I for Enhanced Hydrolysis Efficiency

Researchers from Nanjing Forestry University have made a groundbreaking discovery in the field of industrial crops and products. By inserting additional proline/glycine residues or O-glycosylation sites into the linker region of cellobiohydrolase I (CBHI), they were able to enhance the enzyme's catalytic activity and lignin tolerance, resulting in significantly improved hydrolysis efficiency of cellulose under lignin-supplemented conditions. This study provides a promising strategy for improving the efficiency of cellulase hydrolysis, a crucial step in the production of biofuels and other bioproducts.

Key Takeaways:

• The researchers constructed a series of linker-mutants of CBHI by inserting additional proline/glycine residues or O-glycosylation sites and compared their hydrolytic performances with that of the wild-type enzyme under both lignin-free and lignin-supplemented conditions.
• The mutant enzyme CBHI-L+8 exhibited a 60% higher cellulose hydrolysis efficiency than the wild-type CBHI under lignin conditions, due to concurrent improvements in catalytic activity and lignin tolerance.
• SAXS analysis showed linker region insertion of proline/glycine and/or O-glycosylation motifs induced mutation-dependent structural alterations, which may optimize the interaction between mutants and cellulose.
• This study demonstrates that linker engineering via proline/glycine and glycosylation modifications is a viable strategy to concurrently enhance CBHI's catalytic efficiency and lignin tolerance.
• The research has been peer-reviewed and published in the journal Industrial Crops and Products.

Statistics:

• 60%: the increase in cellulose hydrolysis efficiency of CBHI-L+8 compared to wild-type CBHI under lignin conditions.
• 234: the number of publication in the journal Industrial Crops and Products.
• 1043 N X: the postal code of Elsevier's address in Amsterdam, Netherlands.

Sources:

• Industrial Crops and Products, 2025;234.
• NewsRx LLC. Studies from Nanjing Forestry University Provide New Data on Industrial Crops and Products (Engineering the Linker Region of Cellobiohydrolase I From trichoderma Reesei for Enhanced Hydrolysis Efficiency of Cellulose Under ...). Journal of Engineering. October 20, 2025; p 15435.
• Nanjing Forestry University, Natl Key Lab Dev & Utilizat Forest Food Resources, Nanjing 210037, People's Republic of China.
• National Natural Science Foundation of China (NSFC).
• Priority Academic Program Development of Jiangsu Higher Education Institutions.