Docking and SAR studies of d- and l-isofagomine isomers as human β-glucocerebrosidase inhibitors
作者:Atsushi Kato、Saori Miyauchi、Noriko Kato、Robert J. Nash、Yuichi Yoshimura、Izumi Nakagome、Shuichi Hirono、Hiroki Takahata、Isao Adachi
DOI:10.1016/j.bmc.2011.04.011
日期:2011.6
We report the structure-activity relationship of a series of D-, and L-isofagomine and fagomine isomers as glycosidase inhibitors. Our study revealed that a positive charge at the anomeric position of D-isofagomines enhanced the potency toward beta-glycosidases, while the epimerization at the C3 OH group drastically reduced their inhibitory potency by over three orders of magnitude. Furthermore, D-3,4-di-epi-isofagomine abolished their inhibition activities against all enzymes. L-Isofagomine was also a fairly potent inhibitor of human beta-glucocerebrosidase, with an IC50 value of 8.7 mu M. A molecular docking study revealed that the positions and orientations of the piperidine ring of D-3-epi-isofagomine in the binding site was similar to that of D-isofagomine, while D-3-epi-isofagomine missed the hydrogen bond interactions between Asp127 and the 3-OH group and between Trp179 and the 3-OH group. Furthermore, the top 10 docking models ranked by IFDscore suggested that D-3,4-di-epi-isofagomine can not bind to beta-glucocerebrosidase at a stable interaction mode. These results provide an insight into the structural requirements of isofagomine isomers for developing a new type of pharmacological chaperone for Gaucher disease. (C) 2011 Elsevier Ltd. All rights reserved.