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High Throughput Screening of Fungal Endoglucanase Activity in Escherichia coli

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Engineering of a multifunctional hemicellulase.

Zhanmin Fan¹, Joshua R Werkman, Ling Yuan

¹Department of Plant and Soil Sciences and Kentucky Tobacco Research and Development Center, University of Kentucky, Lexington, KY 40546, USA.

Biotechnology Letters

|January 27, 2009

Summary

This summary is machine-generated.

A novel multifunctional enzyme was engineered by combining xylanase and arabinofuranosidase/xylosidase activities. This engineered enzyme efficiently degrades natural xylans and corn stover, outperforming parental enzyme mixtures.

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Area of Science:

Biotechnology
Enzyme Engineering
Biocatalysis

Background:

Xylan-degrading enzymes are crucial for biomass conversion.
Engineering multifunctional enzymes can enhance efficiency.
The xylanase domain of Clostridium thermocellum xylanase (xynZ) has uncharacterized endoglucanase activity.

Purpose of the Study:

To create a multifunctional enzyme with xylanase, endoglucanase, arabinofuranosidase, and xylosidase activities.
To evaluate the performance of the engineered chimera compared to parental enzymes.

Main Methods:

A chimera was constructed by fusing the xynZ xylanase domain with a dual functional arabinofuranosidase/xylosidase (DeAFc).
The chimera was expressed in E. coli and purified.
Enzyme activity and hydrolysis of natural xylans and corn stover were assessed.

Main Results:

The engineered chimera exhibited xylanase, endoglucanase, arabinofuranosidase, and xylosidase activities.
The chimera maintained pH, temperature optima, and kinetics similar to parental enzymes.
The chimera demonstrated superior activity in hydrolyzing natural xylans and corn stover compared to a mixture of parental enzymes.

Conclusions:

A novel multifunctional enzyme with broad substrate specificity was successfully engineered.
The engineered enzyme offers improved efficiency for xylan and lignocellulosic biomass degradation.
This enzyme holds potential for applications in biofuel production and biorefining.