ICMT Inhibitor - Calbiochem (C15-1303-440)

General description

A cell-permeable indole acetamide compound that inhibits Icmt (isoprenylcysteine carboxyl methyltransferase) activity in an acceptor substrate isoprenylated cysteine-competitive (K_i = 0.02 µM; IC₅₀ = 0.29 and 2.1 µM, respectively, with or without inhibitor preincubation; Substrate = S-farnesyl-L-cysteine) and donor substrate AdoMet-noncompetitive manner, exhibiting no activity against FTase, gernaylgeranyltransferase type I, CaaX protease Rce1, AdoMet-dependent DNA methyltransferase, SssI DNA methyltransferase, or PCMT1 protein methyltransferase. Shown to inhibit the proliferation of non-cancer MEF cells (by 100% at 30 µM) and prevent anchorage-independent growth of colon cancer DKOB8 (by >90% at 20 µM) in a dose- and Icmt-dependent manner. Cysmethynil (25 µM) induces G1 cell cycle-arrest and autophagy-mediated, but not apoptotic, cell death in prostate cancer PC3 cells with concomitant PI 3-K/Akt and mTOR signaling blockage, consistent with inhibition of Icmt-mediated activation of Ras and Rheb GTPases. Murine PC3 xenograft studies reveal limited in vivo efficacy (tumor volume on day 28 = 9- and 22-fold of day 0, respectively, with or without 200 mg/kg/i.p. q.o.d.).

A cell-permeable indole acetamide that acts as a substrate-competitive and AdoMet-noncompetitive Icmt (isoprenylcysteine carboxyl methyltransferase) inhibitor (K_i = 0.02 µM; IC₅₀ = 0.29 µM; Substrate = S-farnesyl-L-cysteine), exhibiting no activity against FTase, gernaylgeranyltransferase type I, CaaX protease Rce1, AdoMet-dependent DNA methyltransferase, SssI DNA methyltransferase, or PCMT1 protein methyltransferase. Cysmethynil (25 µM) induces G1 cell cycle-arrest and autophagy-mediated, but not apoptotic, cell death in prostate cancer PC3 cells with concomitant PI 3-K/Akt and mTOR signaling blockage, consistent with inhibition of Icmt-mediated activation of Ras and Rheb GTPases. Murine PC3 xenograft studies reveal limited in vivo efficacy.

Packaging

Packaged under inert gas

Warning

Toxicity: Regulatory Review (Z)

Reconstitution

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 6 months at -20°C).

Other Notes

Go, M.L., et al. 2010. J. Med. Chem.53, 6838; Wang, M., et al. 2008. J. Biol. Chem.283, 18678; Baron, R.A., et al. 2007. Biochemistry46, 554; Winter-Vann, A.M., et al. 2005. Proc. Natl. Acad. Sci. USA102, 4336.

Legal Information

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Molecular Weight: 612.66. Empirical Formula: C₂₅H₃₂N₂₀. Quality Level: 100. Assay: ≥. 95% (HPLC). form: semisolid. manufacturer/tradename: Calbiochem^®. . storage condition: OK to freeze, protect from light. color: pale yellow. solubility: DMSO: 100 . mg/mL. shipped in: ambient. storage temp.: −. 20°C. Storage Class Code: 11 - Combustible Solids. WGK: WGK 3. Flash Point(F): Not applicable. Flash Point(C): Not applicable.