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Fluorescent Membrane Tension Probes for Early Endosomes
Author(s) -
Piazzolla Francesca,
Mercier Vincent,
Assies Lea,
Sakai Naomi,
Roux Aurelien,
Matile Stefan
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202016105
Subject(s) - endosome , endocytosis , context (archaeology) , membrane , microbiology and biotechnology , fluorescence , biophysics , live cell imaging , horseradish peroxidase , chemistry , tension (geology) , nanotechnology , biology , materials science , biochemistry , physics , enzyme , optics , receptor , paleontology , cell , intracellular , ultimate tensile strength , metallurgy
Fluorescent flipper probes have been introduced recently to image membrane tension in live cells, and strategies to target these probes to specific membranes are emerging. In this context, early endosome (EE) targeting without the use of protein engineering is especially appealing because it translates into a fascinating transport problem. Weakly basic probes, commonly used to track the inside of acidic late endosomes and lysosomes, are poorly retained in EE because they are sufficiently neutralized in weakly acidic EE, thus able to diffuse out. Here, we disclose a rational strategy to target EE using a substituted benzylamine with a higher p K a value as a head group of the flipper probe. The resulting EE flippers are validated for preserved mechanosensitivity, ready for use in biology, particularly to elucidate the mechanics of endocytosis.