1H-Benz[de]isoquinoline-1,3(2H)-dione, 2,2'-(iminodi-2,1-ethanediyl)bis-

M-31850 is a potent, selective and competitive β-hexosaminidase (Hex) inhibitor with IC50s of 6.0 μM and 3.1 μM for human HexA and human HexB, respectively. M-31850 also competitively inhibits β-N-acetyl-D-hexosaminidase OfHex2 with a Ki of 2.5 μM[1][2]. 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)[1]. M-31850 produces a dose dependent increase in MUG hydrolysis (Hex S levels) in lysates from treated infantile Sandhoff disease (ISD) cells[1]. 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[1].

[1]. Michael B Tropak, et al. High-throughput screening for human lysosomal beta-N-Acetyl hexosaminidase inhibitors acting as pharmacological chaperones. Chem Biol. 2007 Feb;14(2):153-64. [2]. Qi Chen, et al. Exploring unsymmetrical dyads as efficient inhibitors against the insect β-N-acetyl-D-hexosaminidase OfHex2. Biochimie. 2014 Feb;97:152-62.