Volume 57, Issue 39 pp. 12771-12774
Communication

Modular Redesign of a Cationic Lytic Peptide To Promote the Endosomal Escape of Biomacromolecules

Dr. Yusuke Azuma

Dr. Yusuke Azuma

Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 Japan

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Haruka Imai

Haruka Imai

Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 Japan

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Dr. Yoshimasa Kawaguchi

Dr. Yoshimasa Kawaguchi

Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 Japan

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Prof. Dr. Ikuhiko Nakase

Prof. Dr. Ikuhiko Nakase

Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 Japan

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Prof. Dr. Hiroshi Kimura

Prof. Dr. Hiroshi Kimura

Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503 Japan

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Prof. Dr. Shiroh Futaki

Corresponding Author

Prof. Dr. Shiroh Futaki

Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 Japan

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First published: 12 August 2018
Citations: 33

Graphical Abstract

Break the trap: Inefficient endosomal escape into the cytosol has been a bottleneck in intracellular delivery of biomacromolecules. With appropriate chemical modifications, a cationic amphiphilic peptide, Mastoparan X, became a useful delivery tool that selectively disrupts the endosomal membranes and releases entrapped materials.

Abstract

Endocytosis is an important route for the intracellular delivery of biomacromolecules, wherein their inefficient endosomal escape into the cytosol remains a major barrier. Based on the understanding that endosomal membranes are negatively charged, we focused on the potential of cationic lytic peptides for developing endosomolysis agents to release such entrapped molecules. As such, a venom peptide, Mastoparan X, was employed and redesigned to serve as a delivery tool. Appending a tri-glutamate unit to the N-terminus attenuates the cytotoxicity of Mastoparan X by about 40 fold, while introduction of a NiII-dipicolylamine complex enhances cellular uptake of the peptide by about 17 fold. Using the optimized peptide, various fluorescently labeled macromolecules were successfully delivered to the cytosol, enabling live-cell imaging of acetylated histones.

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