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Salt-Switchable Artificial Cellulase Regulated by a DNA Aptamer
Mari Takahara1, Geisa Aparecida Lopes Gonçalves Budinova1, Hikaru Nakazawa2
1Department of Applied Chemistry, Graduate School of Engineering, Kyushu University , 744 Motooka, Fukuoka 819-0395, Japan.
Biomacromolecules
|September 8, 2016
Summary
Researchers engineered an artificial cellulase by linking a DNA aptamer to an enzyme, creating a controllable biocatalyst. This novel construct shows potential for solid-surface applications in biotechnology.
Area of Science:
- Biotechnology and Synthetic Biology
- Enzyme Engineering
- Nucleic Acid Aptamer Applications
Background:
- Cellulases are crucial enzymes for breaking down cellulose, a complex biopolymer.
- Traditional cellulase engineering often focuses on modifying protein structures.
- DNA aptamers offer unique binding and responsive properties for molecular applications.
Purpose of the Study:
- To develop a novel artificial cellulase by replacing the natural carbohydrate-binding module with a DNA aptamer.
- To investigate the cellulose-binding characteristics of the DNA aptamer.
- To create a functional cellulase conjugate with controllable substrate adsorption and enzymatic activity.
Main Methods:
- Conjugation of a DNA aptamer (CelApt) to an endoglucanase catalytic domain.
- Circular dichroism spectroscopy and adsorption isotherm analysis to characterize CelApt binding.
- Evaluation of the enzymatic activity and substrate adsorption of the engineered cellulase conjugate.
Main Results:
- The DNA aptamer CelApt exhibits G-quadruplex and stem-loop structures, with salt-stabilized binding to amorphous cellulose regions.
- The CelApt-catalytic domain conjugate demonstrated salt-switchable adsorption to solid cellulose substrates.
- The artificial cellulase retained enzymatic activity comparable to the wild-type enzyme.
Conclusions:
- A novel artificial cellulase was successfully engineered using a DNA aptamer for cellulose binding.
- The DNA aptamer's salt-responsive binding enables controllable enzyme adsorption on solid surfaces.
- This study highlights the potential of responsive DNA aptamers in solid-surface biocatalysis.
