Document Detail


Expression of mutated glucocerebrosidase alleles in human cells.
MedLine Citation:
PMID:  9175735     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Gaucher disease is a heterogeneous disease characterized by impaired activity of the lysosomal enzyme glucocerebrosidase. This heterogeneity is attributed to a large number of mutations in the corresponding gene. In order to test the biochemical properties of some mutations prevalent among Israeli populations, the normal human glucocerebrosidase cDNA and cDNAs carrying mutations N370S, L444P, D409H, recTL, recNcil, P415R and 84GG were coupled to the T7 RNA polymerase promoter in a vaccinia virus-derived expression vector (pTM-1). Recombinant viruses were produced and used to infect human tissue culture cells. RNA and protein stability, recognition by anti-glucocerebrosidase monoclonal antibodies and intracellular enzymatic activity were measured. The results demonstrated that the D409H allele directed synthesis of cytoplasmic RNA with decreased stability compared with its normal counterpart or other mutated forms. The D409H and L444P mutated proteins had lower stability than that of their normal counterpart, while the recNcil-mutated protein was more stable. Only glucocerebrosidase forms harboring leucine at position 444 were recognized by the anti-glucocerebrosidase monoclonal antibodies used (8E4 and 2C7). Measurements of enzymatic activity of the recombinant proteins in cells loaded with a fluorescent glucosylceramide demonstrated that the N370S mutated enzyme had activity similar to that of the normal enzyme. The other mutated enzymes exhibited varying degrees of activities, generally corresponding to the phenotypes with which they are associated. The results presented demonstrate the use of the vaccinia virus-derived expression system and of loading living cells with fluorescent substrate as efficient tools for studying mutants in Gaucher disease and in other lysosomal diseases.
Authors:
M Pasmanik-Chor; L Madar-Shapiro; E O Stein; H Aerts; S Gatt; M Horowitz
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Human molecular genetics     Volume:  6     ISSN:  0964-6906     ISO Abbreviation:  Hum. Mol. Genet.     Publication Date:  1997 Jun 
Date Detail:
Created Date:  1997-07-29     Completed Date:  1997-07-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9208958     Medline TA:  Hum Mol Genet     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  887-95     Citation Subset:  IM    
Affiliation:
Department of Cell Research and Immunology, Tel-Aviv University, Ramat-Aviv, Israel.
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MeSH Terms
Descriptor/Qualifier:
Alleles*
Animals
Cell Line
Cercopithecus aethiops
Gene Expression*
Genetic Vectors
Glucosylceramidase / genetics*,  metabolism
Humans
Mutation
Protein Processing, Post-Translational
RNA
Recombination, Genetic
Vaccinia virus
Chemical
Reg. No./Substance:
63231-63-0/RNA; EC 3.2.1.45/Glucosylceramidase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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