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Updated: Jun 11, 2026

Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System

Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System

Published on: August 8, 2016

Reprogramming chitosanase specificity via a structure-guided engineering and high-throughput screening platform.

Chih-Yu Cheng¹, Chia-Huang Tsai¹, Pei-Jyun Liou¹

¹Department of Marine Biotechnology, National Kaohsiung University of Science and Technology, Kaohsiung, 81157, Taiwan.

International Journal of Biological Macromolecules

|June 9, 2026

Summary

Researchers reprogrammed Bacillus circulans MH-K1 chitosanase to produce specific chitooligosaccharides (COS). This engineered enzyme yields primarily chitotriose, advancing precision biocatalysis for defined carbohydrate products.

Keywords:

Chitosanase Chitotriose Glycoside hydrolase High-throughput screening Protein engineering Substrate specificity

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Last Updated: Jun 11, 2026

Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System

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Published on: August 8, 2016

In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

Published on: March 25, 2020

Area of Science:

Biocatalysis
Enzyme Engineering
Carbohydrate Chemistry

Background:

Chitosanases produce heterogeneous chitooligosaccharides (COS), limiting applications and structure-activity studies.
Developing methods for producing structurally defined COS is crucial for their effective utilization.

Purpose of the Study:

To reprogram Bacillus circulans MH-K1 chitosanase for precise production of defined chitooligosaccharides.
To establish a structure-guided strategy for controlling product length in GH46 chitosanases.

Main Methods:

Integrated platform combining homology modeling, saturation mutagenesis, and high-throughput screening.
Engineering specific amino acid residues (A174/L175, H75/P76) to alter enzyme activity.
Fluorescence binding analysis and docking studies to understand substrate binding and cleavage mechanisms.

Main Results:

A variant enzyme, Csn-TI-D, was generated, yielding chitotriose with 84-90% of detectable COS signal.
The wild-type enzyme produced only ~30% chitotriose, highlighting the engineered specificity.
Mutations weakened the (-2) subsite affinity and introduced an electrostatic gate, shifting substrate binding for trimer-length alignment.

Conclusions:

A scalable, structure-guided strategy effectively reprograms chitosanase product length.
Precision biocatalytic production of defined chitooligosaccharides is achievable.
This approach facilitates structure-activity relationship studies and specific applications of COS.