| Description | Ansamitocin p-3 (Maytansinol isobutyrate) is an inhibitor of microtubule with IC50 of 3.4 μM for tubulin polymerization. |
| In vitro | Ansamitocin p-3 inhibits the proliferation in a concentration-dependent manner with IC50s of 20, 50, 140, and 150 pM for MCF-7, HeLa, EMT-6/AR1, and MDA-MB-231 cells in culture, respectively. Ansamitocin P3 binds to purified tubulin (Kd = 1.3 µM)[1]. |
| Synonyms | Maytansinol isobutyrate, Antibiotic C 15003P3, NSC292222 |
| molecular weight | 635.14 |
| Molecular formula | C32H43ClN2O9 |
| CAS | 66584-72-3 |
| Storage | Powder: -20°C for 3 years | In solvent: -80°C for 1 year |
| Solubility | DMSO: 90.0 mg/mL (141.7 mM) |
| References | 1. Kiso T, et al. Screening for microtubule-disrupting antifungal agents by using a mitotic-arrest mutant of Aspergillus nidulans and novel action of phenylalanine derivatives accompanying tubulin loss. Antimicrob Agents Chemother. 2004 May;48(5):1739-48 2. Venghateri JB, et al. Ansamitocin P3 depolymerizes microtubules and induces apoptosis by binding to tubulin at thevinblastine site. PLoS One. 2013 Oct 4;8(10):e75182. |