(S)-3’-amino Blebbistatin is a more stable and less phototoxic form of (–)-blebbistatin , which is a selective cell-permeable inhibitor of non-muscle myosin II ATPases.
1,2 (–)-Blebbistatin rapidly and reversibly inhibits Mg-ATPase activity and
in vitro motility of non-muscle myosin IIA and IIB for several species (IC
50s = 0.5-5 μM), while poorly inhibiting smooth muscle myosin (IC
50 = 80 μM).
3 Through these effects, it blocks apoptosis-related bleb formation, directed cell migration, and cytokinesis in vertebrate cells. However, prolonged exposure to blue light (450-490 nm) results in degradation of blebbistatin to an inactive product
via cytotoxic intermediates, which may be problematic for its use in fluorescent live cell imaging applications.
4,5 The addition of a 3’-amino group decreases the inherent fluorescence while retaining the activity of (–)-blebbistatin.
6 (S)-3'-amino Blebbistatin has the same stereochemistry as the active (–)-blebbistatin enantiomer.
1. Straight, A.F., Cheung, A., Limouze, J., et al. Dissecting temporal and spatial control of cytokinesis with a myosin II inhibitor Science 299(5613),1743-1747(2003).
2. Kovács, M., Tóth, J., Hetényi, C., et al. Mechanism of blebbistatin inhibition of myosin II J. Biol. Chem. 279(34),35557-35563(2004).
3. Limouze, J., Straight, A.F., Mitchison, T., et al. Specificity of blebbistatin, an inhibitor of myosin II J. Muscle Res. Cell Motil. 25(4-5),337-341(2004).
4. Kolega, J. Phototoxicity and photoinactivation of blebbistatin in UV and visible light Biochem. Biophys. Res. Commun. 320(3),1020-1025(2004).
5. Sakamoto, T., Limouze, J., Combs, C.A., et al. Blebbistatin, a myosin II inhibitor, is photoinactivated by blue light Biochemistry 44(2),584-588(2005).
6. Verhasselt, S., Roman, B.I., De Wever, O., et al. Discovery of (S)-3'-hydroxyblebbistatin and (S)-3'-aminoblebbistatin: Polar myosin II inhibitors with superior research tool properties Org. Biomol. Chem. 15(9),2104-2118(2017).
