Jasplakinolide is a natural macrocyclic peptide first isolated from a marine sponge. It potently inhibits the proliferation of PC3 prostate carcinoma cells (IC50 = 35 nM) by binding F-actin (KD = 15 nM).[1] This binding of jasplakinolide to actin, which is competitive with phalloidin, stabilizes actin filaments in vitro but disrupts actin filaments and induces irregular polymerization of monomeric actin in vivo.[1],[2] This compound is used to investigate the role of actin in diverse cellular roles, such as motility, transport, and development.[3],[4]
Reference:
[1]. Bubb, M.R., Senderowicz, A.M.J., Sausville, E.A., et al. Jasplakinolide, a cytotoxic natural product, induces actin polymerization and competitively inhibits the binding of phalloidin to F-actin. The Journal of Biological Chemisty 269(21), 14869-14871 (1994).
[2]. Bubb, M.R., Spector, I., Beyer, B.B., et al. Effects of jasplakinolide on the kinetics of actin polymerization. An explanation for certain in vivo observations. The Journal of Biological Chemisty 275(7), 5163-5170 (2000).
[3]. Van Goor, D., Hyland, C., Schaefer, A.W., et al. The role of actin turnover in retrograde actin network flow in neuronal growth cones. PLoS One 7(2), (2012).
[4]. Zhang, X., Cui, X., Cheng, L., et al. Actin stabilization by jasplakinolide affects the function of bone marrow-derived late endothelial progenitor cells. PLoS One 7(11), (2012).