(-)-Blebbistatin purchased from Sigma B05650-1mg

Info from Cayman:

A stock solution may be made by dissolving the (±)-blebbistatin in an organic solvent purged with an inert gas. (±)-Blebbistatin is soluble in organic solvents such as DMSO and dimethyl formamide (DMF). The solubility of (±)-blebbistatin in these solvents is approximately 10 mg/mL.

(±)-Blebbistatin is sparingly soluble in aqueous buffers. For maximum solubility in aqueous buffers, (±)-blebbistatin should first be dissolved in DMF and then diluted with the aqueous buffer of choice. (±)-Blebbistatin has a solubility of approximately 0.5 mg/ml in a 1:1 solution of DMF:PBS (pH 7.2) using this method. We do not recommend storing the aqueous solution for more than one day.

(±)-Blebbistatin is a selective cell-permeable inhibitor of non-muscle myosin II ATPases.1,2 It rapidly and reversibly inhibits Mg-ATPase activity and in vitro motility of non-muscle myosin IIA and IIB for several species (IC50 = 0.5-5.0 μM), while poorly inhibiting smooth muscle myosin (IC50 = 80 μM).3 Through these effects, blebbistatin blocks apoptosis-related bleb formation, directed cell migration and cytokinesis in vertebrate cells. Blebbistatin is inactivated by UV light,4 which may be particularly important in fluorescent cell imaging applications.

Note green fluorescent crystals seen in a 75µM solution.

Stock was 1 mg/mL in DMSO

44 µL 1mg/mL blebbistatin in DMSO in 1 mL non-CO2 medium


1 mg in 34 µL DMSO = ~100mM

MW = 292

Use at ~150 µM

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