Gerasimaitė R, Bucevičius J, Kiszka KA, Schnorrenberg S, Kostiuk G, Koenen T, Lukinavičius G. Blinking Fluorescent Probes for Tubulin Nanoscopy in Living and Fixed Cells.
ACS Chem Biol 2021;
16:2130-2136. [PMID:
34734690 PMCID:
PMC8609524 DOI:
10.1021/acschembio.1c00538]
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Abstract
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Here we report a
small molecule tubulin probe for single-molecule
localization microscopy (SMLM), stimulated emission depletion (STED)
microscopy and MINFLUX nanoscopy, which can be used in living and
fixed cells. We explored a series of taxane derivatives containing
spontaneously blinking far-red dye hydroxymethyl silicon–rhodamine
(HMSiR) and found that the linker length profoundly affects the probe
permeability and off-targeting in living cells. The best performing
probe, HMSiR-tubulin, is composed of cabazitaxel and the 6′-regioisomer
of HMSiR bridged by a C6 linker. Microtubule diameter of ≤50
nm was routinely measured in SMLM experiments on living and fixed
cells. HMSiR-tubulin allows a complementary use of different nanoscopy
techniques for investigating microtubule functions and developing
imaging methods. For the first time, we resolved the inner microtubule
diameter of 16 ± 5 nm by optical nanoscopy and thereby demonstrated
the utility of a self-blinking dye for MINFLUX imaging.
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