Pharmacological Chaperones for the Treatment of α-Mannosidosis
作者:Rocío Rísquez-Cuadro、Reimi Matsumoto、Fernando Ortega-Caballero、Eiji Nanba、Katsumi Higaki、José Manuel García Fernández、Carmen Ortiz Mellet
DOI:10.1021/acs.jmedchem.9b00153
日期:2019.6.27
alpha-Mannosidosis (AM) results from deficient lysosomal a-mannosidase (LAMAN) activity and subsequent substrate accumulation in the lysosome, leading to severe pathology. Many of the AM-causative mutations compromise enzyme folding and could be rescued with purpose-designed pharmacological chaperones (PCs). We found that PCs combining a LAMAN glycone-binding motif based on the 5N,6O-oxomethylidenemannojirimycin (OMJ) glycomimetic core and different aglycones, in either mono- or multivalent displays, elicit binding modes involving glycone and non-glycone enzyme regions that reinforce the protein folding and stabilization potential. Multivalent derivatives exhibited potent enzyme inhibition that generally prevailed over the chaperone effect. On the contrary, monovalent OMJ derivatives with LAMAN aglycone binding area-fitting substituents proved effective as activity enhancers for several mutant LAMAN forms in AM patient fibroblasts and/or transfected MAN2B1-KO cells. This translated into a significant improvement in endosomal/lysosomal function, reverting not only the primary LAMAN substrate accumulation but also the additional downstream consequences such as cholesterol accumulation.