Caged Molecular Glues as Photoactivatable Tags for Nuclear Translocation of Guests in Living CellsClick to copy article linkArticle link copied!
Abstract

We developed dendritic caged molecular glues (CagedGlue-R) as tags for nucleus-targeted drug delivery, whose multiple guanidinium ion (Gu+) pendants are protected by an anionic photocleavable unit (butyrate-substituted nitroveratryloxycarbonyl; BANVOC). Negatively charged CagedGlue-R hardly binds to anionic biomolecules because of their electrostatic repulsion. However, upon exposure of CagedGlue-R to UV light or near-infrared (NIR) light, the BANVOC groups of CagedGlue-R are rapidly detached to yield an uncaged molecular glue (UncagedGlue-R) that carries multiple Gu+ pendants. Because Gu+ forms a salt bridge with PO4–, UncagedGlue-R tightly adheres to anionic biomolecules such as DNA and phospholipids in cell membranes by a multivalent salt-bridge formation. When tagged with CagedGlue-R, guests can be taken up into living cells via endocytosis and hide in endosomes. However, when the CagedGlue-R tag is photochemically uncaged to form UncagedGlue-R, the guests escape from the endosome and migrate into the cytoplasm followed by the cell nucleus. We demonstrated that quantum dots (QDs) tagged with CagedGlue-R can be delivered efficiently to cell nuclei eventually by irradiation with light.
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