Cited by 42Glycosylation and Glycoproteins ResearchCarbohydrate Chemistry and SynthesisLysosomal Storage Disorders Research

The DOI matches its Crossref record; 44 of the 44 references it cites were found in a registry or an index.

Cellular effects of deoxynojirimycin analogues: inhibition of N-linked oligosaccharide processing and generation of free glucosylated oligosaccharides

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Abstract

In the accompanying paper [Mellor, Neville, Harvey, Platt, Dwek and Butters (2004) Biochem. J. 381, 861-866] we treated HL60 cells with N-alk(en)yl-deoxynojirimycin (DNJ) compounds to inhibit glucosphingolipid (GSL) biosynthesis and identified a number of non-GSL-derived, small, free oligosaccharides (FOS) most likely produced due to inhibition of the oligosaccharide-processing enzymes a-glucosidases I and II. When HL60 cells were treated with concentrations of N-alk(en)ylated DNJ analogues that inhibited GSL biosynthesis completely, N-butyl- and N-nonyl-DNJ inhibited endoplasmic reticulum (ER) glucosidases I and II, but octadecyl-DNJ did not, probably due to the lack of ER lumen access for this novel, long-chain derivative. Glucosidase inhibition resulted in the appearance of free Glc1-3Man structures, which is evidence of Golgi glycoprotein endomannosidase processing of oligosaccharides with retained glucose residues. Additional large FOS was also detected in cells following a 16 h treatment with N-butyl- and N-nonyl-DNJ. When these FOS structures (>30, including >20 species not present in control cells) were characterized by enzyme digests and MALDI-TOF (matrix-assisted laser-desorption ionization-time-of-flight) MS, all were found to be polymannose-type oligosaccharides, of which the majority were glucosylated and had only one reducing terminal GlcNAc (N-acetylglucosamine) residue (FOS-GlcNAc1), demonstrating a cytosolic location. These results support the proposal that the increase in glucosylated FOS results from enzyme-mediated cytosolic cleavage of oligosaccharides from glycoproteins exported from the ER because of misfolding or excessive retention. Importantly, the present study characterizes the cellular properties of DNJs further and demonstrates that side-chain modifications allow selective inhibition of protein and lipid glycosylation pathways. This represents the most detailed characterization of the FOS structures arising from ER a-glucosidase inhibition to date.

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Metadata

Authors
MELLOR, H. R., NEVILLE, D. C. A., HARVEY, D. J., PLATT, F. M., DWEK, R. A., & BUTTERS, T. D.
Affiliations
University of Oxford (GB)
Venue
Biochemical Journal
Published
2004-07-27
Volume
381
Issue
3
Pages
867-875
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W2113559283
Cited by
41
References
44
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2022: 1 · 2021: 1 · 2020: 3 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 1 · 2014: 1 · 2013: 4
FWCI
1.30
Type
journal article
Language
en
Open access
Locations
  • Biochemical Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glycosylation and Glycoproteins Research
  • Physical Sciences › Chemistry › Organic Chemistry › Carbohydrate Chemistry and Synthesis
  • Health Sciences › Medicine › Genetics (clinical) › Lysosomal Storage Disorders Research
Keywords
free oligosaccharides, N-linked oligosaccharide processing, N-acetylglucosamine, glycosylation inhibition, HL-60 cells
MeSH terms
Acetylglucosamine, alpha-Glucosidases, Amino Sugars, Carbohydrate Conformation, Carbohydrate Sequence, Chromatography, High Pressure Liquid, Glucose, Glycosylation, Humans, Mannose, Oligosaccharides, 1-Deoxynojirimycin, HL-60 Cells, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization, alpha-Mannosidase, Cell Line, Tumor

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