Stefanie Kühn, Veselin Nasufovic, Jonas Wilhelm, Julian Kompa, Eline M. F. de Lange, Yin-Hsi Lin, Cornelia Egoldt, Jonas Fischer, Artem Lennoi, Miroslaw Tarnawski, Jochen Reinstein, Rifka Vlijm, Julien Hiblot, Kai Johnsson
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引用次数: 0
Abstract
SNAP-tag is a powerful tool for labeling proteins with synthetic fluorophores in bioimaging. However, its utility in live-cell applications can be constrained by its relatively slow labeling kinetics and the limited cell permeability of its substrates. Here, we introduce improved labeling substrates and an engineered SNAP-tag for faster labeling in vitro and in live cells. SNAP-tag2 presents a second-order rate constant with rhodamine substrates that approaches 107 s−1 M−1, a 100-fold improvement over the corresponding SNAP-tag–substrate pairs. When labeled with highly fluorogenic dyes, SNAP-tag2 also shows a fivefold increase in fluorescence brightness relative to currently used SNAP-tag. The increased labeling kinetics and brightness of SNAP-tag2 translate into greatly improved performance in various live-cell (super-resolution) imaging applications.
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Nature Chemical Biology stands as an esteemed international monthly journal, offering a prominent platform for the chemical biology community to showcase top-tier original research and commentary. Operating at the crossroads of chemistry, biology, and related disciplines, chemical biology utilizes scientific ideas and approaches to comprehend and manipulate biological systems with molecular precision.
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