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<i>In vitro</i> directed evolution of alpha-hemolysin by liposome display
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- Fujii Satoshi
- Japan Science and Technology (JST), ERATO, Yomo Dynamical Micro-scale Reaction Environment Project
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- Matsuura Tomoaki
- Japan Science and Technology (JST), ERATO, Yomo Dynamical Micro-scale Reaction Environment Project Graduate School of Engineering, Osaka University
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- Yomo Tetsuya
- Japan Science and Technology (JST), ERATO, Yomo Dynamical Micro-scale Reaction Environment Project Graduate School of Information Science and Technology, Osaka University Graduate School of Frontier Biosciences, Osaka University Earth-Life Science Institute, Tokyo Institute of Technology
Bibliographic Information
- Other Title
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- In vitro directed evolution of alpha-hemolysin by liposome display
Description
We have developed a method to enable in vitro directed evolution that can be applied to membrane proteins. This method, termed liposome display, uses liposomes as compartments in which membrane proteins are synthesized and as scaffolds for membrane protein integration. Thus, the synthesized membrane proteins are displayed on the surface of the liposome and exhibit their functions. A randomly mutated DNA library of the membrane protein was generated, encapsulated in the liposomes at the single-molecule level, and used to generate a liposome library. Liposomes displaying the desired membrane protein function were selected, thus accumulating the DNA molecule encoding the desired membrane protein. We have applied this method to alpha-hemolysin, a membrane protein derived from Staphylococcus aureus. Alpha-hemolysin forms a nanopore in the membrane, which allows the penetration of small molecules. We aimed to improve this nanopore activity by using the liposome display method. Consequently, alphahemolysin evolved and attained a higher specific affinity for the liposome membrane. In this review, we describe the essential characteristics of liposome display and the properties of the evolved alpha-hemolysin obtained by this method.
Journal
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- BIOPHYSICS
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BIOPHYSICS 11 (0), 67-72, 2015
The Biophysical Society of Japan