In Vitro: M-31850 shows some activity towards Jack Bean Hex (JBHex) and bacterial Hex from Streptomyces plicatus (SpHex) (IC50 of 280 μM and >500 μM for JBHex and SpHex, respectively). ?M-31850 produces a dose dependent increase in MUG hydrolysis (Hex S levels) in lysates from treated infantile Sandhoff disease (ISD) cells. ?M-31850 increases the half-life of the mutant Hex A from Adult forms of Tay-Sachs (ATSD) cells more than two-fold at 44° C, relative to the enzyme heated in the presence of DMSO. M-31850 acts as a classic competitive inhibitor of Hex (Km increases and Vmax is unaffected by increasing amounts of M-31850), with a Ki of 0.8 μM.