TPI 287 is a synthetic, third generation taxane with potential antineoplastic activity. TPI 287 binds to tubulin and stabilizes microtubules, resulting in inhibition of microtubule assembly disassembly dynamics, cell cycle arrest at the G2 M phase, and apoptosis.
IBTP is a lipophilic cation that is accumulated in mitochondria and forms stable thioether adducts in a thiol-specific manner. As a result, mitochondrial proteins that have changed thiol redox state following oxidative stress are selectively tagged with IBTP and can be separated by two-dimensional electrophoresis and isolated. IBTP-tagged proteins can also be evaluated by immunoblotting using an antibody directed against the triphenylphosphonium moiety of the IBTP molecule. IBTP has also been used as a mitochondria-targeted soft electrophile to inhibit mitochondrial oxidative phosphorylation.