Document Detail

Biochemical and structural study on a S529V mutant acid α-glucosidase responsive to pharmacological chaperones.
MedLine Citation:
PMID:  21471980     Owner:  NLM     Status:  Publisher    
Recently, pharmacological chaperone therapy for Pompe disease with small molecules such as imino sugars has attracted interest. But mutant acid α-glucosidase (GAA) species responsive to imino sugars are limited. To elucidate the characteristics of a mutant GAA responsive to imino sugars, we performed biochemical and structural analyses. Among cultured fibroblast cell lines derived from Japanese Pompe patients, only one carrying p.S529V/p.S619R amino acid substitutions responded to 1-deoxynojirimycin (DNJ), and an expression study revealed that DNJ, N-butyl-deoxynojirimycin and nojirimycin-1-sulfonic acid increased the enzyme activity of the S529V mutant GAA expressed in Chinese hamster ovary cells. The results of western blotting analysis suggested that these imino sugars facilitated the intracellular transportation of the mutant GAA and stabilized it. Among these imino sugars, DNJ exhibited the strongest action on the mutant GAA. Structural analysis revealed that DNJ almost completely occupied the active site pocket, and interacted with amino acid residues comprising it through van der Waals contacts and hydrogen bonds. This information will be useful for improvement of pharmacological chaperone therapy for Pompe disease.Journal of Human Genetics advance online publication, 7 April 2011; doi:10.1038/jhg.2011.36.
Youichi Tajima; Seiji Saito; Kazuki Ohno; Takahiro Tsukimura; Seiichi Tsujino; Hitoshi Sakuraba
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-07
Journal Detail:
Title:  Journal of human genetics     Volume:  -     ISSN:  1435-232X     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9808008     Medline TA:  J Hum Genet     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1] Department of Clinical Genetics, Meiji Pharmaceutical University, Tokyo, Japan [2] Department of Molecular Medical Research, The Tokyo Metropolitan Institute of Medical Science, Tokyo Metropolitan Organization for Medical Research, Tokyo, Japan.
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