SiR700-Actin Kit

SiR700-Actin Kit

SiR700-actin is based on the far-red silicon rhodamine (SiR) fluorophore analogue SiR700 and the actin binding natural product jasplakinolide. SiR700-actin allows labeling of endogenous F-actin in live cells with high specificity and low background without the need for genetic manipulation or over-expression. The key features of SiR700-actin are i) far-red absorption and emission wavelengths, ii) cell permeability, iii) fluorogenic character, and iv) compatibility with super-resolution microscopy (e.g., STED & SIM). In addition, SiR700 actin can be used for wide-field and confocal fluorescent imaging in living cells. The emission in the far-red wavelength minimizes phototoxicity and sample autofluorescence. SiR700-actin is compatible with GFP and/or m-cherry fluorescent proteins. It can be imaged with standard Cy5 filter sets. Probe quantity allows 35 – 140 staining experiments.*


Optical properties

λabs   689 nm

λEm   716 nm
εmax 1.0·105 mol-1·cm-1

MW   1265.6 g/mol

MF    C73H88N8O10Si


*Based on the following conditions: 0.5 – 1 ml staining solution / staining experiment with 0.5 – 1 µM probe concentration. The number of staining experiments can be further increased by reducing volume or probe concentration.

 Cytoskeleton, Inc. is the exclusive provider of Spirochrome, Ltd. products in North America.


Swiss 3T3 fibroblasts stained by SiR700-Actin (Cat. # CY-SC013)

Kalargyrou, A. et, al. Nanotube-like processes facilitate material transfer between photoreceptors

Featured Papers

"Fluorogenic probes for multi-color imaging in living cells." Lukinavicius G. et al. 2016.  J. Am. Chem. Soc. Doi: 10.1021/jacs.6b04782.


“Fluorogenic probes for live-cell imaging of the cytoskeleton”; G. Lukinavičius, L.Reymond, E. D’Este, A. Masharina, F. Göttfert, H. Ta, A. Güther, M. Fournier, S. Rizzo, H. Waldmann, C. Blaukopf, C. Sommer, D. W. Gerlich, H.-D. Arndt, S. W. Hell & K. Johnsson; Nature Methods 11, 731–733, 2014.


“STED Nanoscopy Reveals the Ubiquity of Subcortical Cytoskeleton Periodicity in Living Neurons”; E. D’Este, D. Kamin, F. Göttfert, A. El-Hady, S. W. Hell; Cell Reports , Volume 10 , Issue 8 , 1246 – 1251, 2015.


“A near-infrared fluorophore for live-cell super-resolution microscopy of cellular proteins”; G. Lukinavičius, K. Umezawa, N. Olivier, A. Honigmann, G. Yang, T. Plass, V. Mueller, L. Reymond, I. R. Corrêa Jr, Z. Luo, C. Schultz, E. A. Lemke, P. Heppenstall, C. Eggeling, S. Manley & K. Johnsson; Nature Chemistry 5, 132–139, 2013.


“Dynamic actin filaments control the mechanical behavior of the human red blood cell membrane”; D. S. Gokhin, R. B. Nowak, J. A. Khoory, A. de la Piedra, I. C. Ghiran and V. M. Fowler; Mol. Biol. Cell; February 25, 2015.


“A cleavable cytolysin-neuropeptide Y bioconjugate enables specific drug delivery and demonstrates intracellular mode of action”; V. M. Ahrens, K. B. Kostelnik, R. Rennert, D. Böhme, S. Kalkhof, D. Kosel, L. Weber, M. von Bergen and A. G. Beck-Sickinger; J. Control. Release; 209:170-178, 2015.


“Red Si–rhodamine drug conjugates enable imaging in GFP cells”; E. Kim, K. S. Yang, R. J. Giedt and R. Weissleder; Chem. Commun., 50, 4504-4507, 2014.


“A marginal band of microtubules transports and organizes mitochondria in retinal bipolar synaptic terminals”; M. Graffe, D. Zenisek, and J. Taraska; J. Gen Physiol. Vol. 146 No.1: 109-117, 2015.



Application Notes


“A Bright Dye for Live-Cell STED Microscopy”; S. Pitsch, I. Köster.