Enzyme enhancement activity of N-octyl-beta-valienamine on beta-glucosidase mutants associated with Gaucher disease.
Gaucher disease (GD), caused by a defect of beta-glucosidase (beta-Glu), is the most common form of sphingolipidosis. We have previously shown that a carbohydrate mimic N-octyl-beta-valienamine (NOV), an inhibitor of beta-Glu, could increase the protein level and enzyme activity of F213I mutant beta-Glu in cultured GD fibroblasts, suggesting that NOV acted as a pharmacological chaperone to accelerate transport and maturation of this mutant enzyme. In the current study, NOV effects were evaluated in GD fibroblasts with various beta-Glu mutations and in COS cells transiently expressing recombinant mutant proteins. In addition to F213I, NOV was effective on N188S, G202R and N370S mutant forms of beta-Glu, whereas it was ineffective on G193W, D409H and L444P mutants. When expressed in COS cells, the mutant proteins as well as the wild-type protein were localized predominantly in the endoplasmic reticulum and were sensitive to Endo-H treatment. NOV did not alter this localization or Endo-H sensitivity, suggesting that it acted in the endoplasmic reticulum. Profiling of N-alkyl-beta-valienamines with various lengths of the acyl chain showed that N-dodecyl-beta-valienamine was as effective as NOV. These results suggest a potential therapeutic value of NOV and related compounds for GD with a broad range of beta-Glu mutations.
Lei
Ke
K
Department of Child Neurology, Tottori University Faculty of Medicine, Yonago 683-8503, Japan.
Ninomiya
Haruaki
H
Suzuki
Michitaka
M
Inoue
Takehiko
T
Sawa
Miwa
M
Iida
Masami
M
Ida
Hiroyuki
H
Eto
Yoshikatsu
Y
Ogawa
Seiichiro
S
Ohno
Kousaku
K
Suzuki
Yoshiyuki
Y
D000818:Animals; D002478:Cells, Cultured; D002522:Chlorocebus aethiops; D004721:Endoplasmic Reticulum / Q000378:metabolism; D005776:Gaucher Disease / Q000235:genetics*; D006026:Glycoside Hydrolases / Q000378:metabolism; D006595:Hexosamines / Q000494:pharmacology*; D006801:Humans; D009154:Mutation; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D001617:beta-Glucosidase / Q000037:antagonists & inhibitors* / Q000235:genetics
D006595:Hexosamines; C116532:N-octyl-beta-valienamine; D011994:Recombinant Proteins; D006026:Glycoside Hydrolases; D001617:beta-Glucosidase