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Published on: June 28, 2019
Construction of a pH-responsive artificial membrane fusion system by using designed coiled-coil polypeptides
Ayumi Kashiwada1, Kiyomi Matsuda, Toshihisa Mizuno
1Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, 1-2-1 Izumi-cho, Narashino, Chiba, Japan. a5kasiwa@cit.nihon-u.ac.jp
Researchers designed a pH-responsive coiled-coil polypeptide to model viral fusion proteins. Acidic conditions promote coiled-coil formation, enhancing polypeptide-induced membrane fusion for artificial systems.
Area of Science:
- Biochemistry
- Molecular Biology
- Biophysics
Background:
- pH-responsive coiled-coil domains in viral fusion proteins are crucial for host cell infection.
- Understanding the link between coiled-coil conformational changes and membrane fusion is vital.
Purpose of the Study:
- To create a de novo designed polypeptide model system for studying pH-responsive coiled-coil dynamics and membrane interactions.
- To investigate the relationship between pH-induced conformational changes and membrane fusion.
Main Methods:
- Design and synthesis of pH-responsive isoleucine-zipper triple-stranded coiled-coil polypeptides.
- Physicochemical methods including circular dichroism for structural analysis.
- Liposomal content leakage, turbidity analysis, dynamic light scattering, and lipid mixing assays for membrane fusion studies.
Main Results:
- Coiled-coil formation is enhanced under acidic pH conditions.
- Acidic pH-induced coiled-coil formation significantly promotes polypeptide-mediated membrane fusion.
- Demonstrated the ability to induce membrane fusion using designed polypeptides.
Conclusions:
- A de novo designed pH-responsive coiled-coil polypeptide system effectively models viral fusion protein behavior.
- Artificial membrane fusion systems can be constructed at a molecular level using these polypeptides.
- The study provides insights into the molecular mechanisms of pH-dependent membrane fusion.
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