SiR-actin is based on the F-actin binding natural product jasplakinolide. SiR-actin is fluorogenic, cell permeable and highly specific for F-actin. Sir-actin stains endogenous F-actin without the need for genetic manipulation or overexpression. Its emission in the far red minimizes phototoxicity and sample autofluorescence. SiR-actin is compatible with GFP and/or m-cherry fluorescent proteins. It can be imaged with standard Cy5 filtersets. SiR-actin can be used for widefield, confocal, SIM or STED imaging in living cells and tissue. Probe quantity allows 50 – 200 staining experiments.*

Optical properties

λ_abs   652 nm

λ_Em   674 nm
ε_max 1.0·10⁵ mol^-1·cm^-1

*Based on the following conditions: 0.5 – 1 ml staining solution / staining experiments with 0.5 – 1 uM 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.