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For live cellsA201-01HMSiR-Halo15 nmol$897.00Affinity ligands to HaloTag® fusion proteins ( In preparation )
A201-0230 nmol$1497.00
  • Available for live cell imaging under the physiological condition
  • Blinking without high-power laser irradiation

Super-resolution imaging techniques, that operate beyond the limit set by the diffraction of light, obtains many new knowledge in cellular biology. Among these techniques, dSTORM (direct stochastic optical reconstruction microscopy), that utilizes blinking fluorescent dyes, are widely known as the method allowing spatial resolution of about 20 nm. The new released HMSiR displays spontaneously blinking in light emission. By using this probe, we can operate super-resolution imaging without thiols, oxygen scavengers or irradiation of high-power laser, all of which were necessary for causing the blinking of fluorescent dyes in the previous dSTORM observation. Therefore, this probe enables live-cell and super-resolution imaging with low-power excitation light under the physiological condition.

Feature of HMSiR

1. Available for live cell imaging under the physiological condition

Fig. 1. Super-resolution and live image of microtubules in Velo cell.

Velo cells, in which HaloTag®-β-tubulin was expressed, were stained by HMSiR-Halo and observed in the medium of Leibovitz L15 containing 10%FBS after replating. Images were obtained by STORM microscopy (N-STORM:TIRFM:647 nm, 100 W/cm2, 15 ms/frame, 1000 frame). A: averaged image. B: super-resolution image. C: Measurement of localization precision in the same laser condition of Fig. 1A and B. At first, antibodies were labeled with HMSiR, absorbed on the glass surface, and observed by STORM (N-STORM). Positions of the molecule were repeatedly obtained and their distribution was fitted by Gaussian. Only signals over 150 photons were analyze. 647 nm, 100 W/cm2, 15 ms/frame, 10 mM PBS (pH7.4). Super-resolution imaging with HMSiR did not need thiols or oxygen scavengers and was operated under the physiological condition. HaloTag® is a trademark of Promega Corporation.

2. Blinking spontaneously without high-power laser irradiation

Fig. 2. Reaction of HMSiR.

Fig. 3. Fluorescence from single HMSiR molecule.

HMSiR displays spontaneously blinking without irradiation of high-power laser (~1 kW cm-2) which is used to be necessary for the dSTORM observation (Fig. 3, laser power: 100 W cm-2, correspondence to On/Off state in Fig. 2). It allows us to minimize the damage of the cell by the laser irradiation used in the previous dSTORM observation.


Uno SN, Kamiya M, Yoshihara T, Sugawara K, Okabe K, Tarhan MC, Fujita H, Funatsu T, Okada Y, Tobita S, Urano Y.

Nat Chem. 2014 681-689.

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