FTase Substrate, Fluorogenic

A pentapeptide substrate based on the carboxyl terminus of H-Ras with a dansyl group attached to the amino terminus. Serves as a substrate for continuous fluorescent monitoring of protein-farnesyl transferase (FTase) activity (kcat = 0.5 s-1; Km = 1.4 µM) in the presence of farnesyl diphosphate. S-farnesylation of the cysteine moiety results in approximately 13-fold enhancement in fluorescence intensity (monitored at l = 505 nm) accompanied by a shift in the emission maximum from 565 nm to 515 nm. Reported to be highly selective for FTase and is not recognized by geranylgeranyltransferase I. Useful for screening of potential FTase inhibitors.

Excitation max.: ~340 nm, Emission max.: ~505 nm e340 = 4,250 M-1 cm-1 

Note: PROTECT FROM LIGHT