Cited by 107Glycosylation and Glycoproteins ResearchCarbohydrate Chemistry and SynthesisCellular transport and secretion

A lectin-resistant mouse lymphoma cell line is deficient in glucosidase II, a glycoprotein-processing enzyme

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Reitman, M L, Trowbridge, I S, Kornfeld, S·1982·Journal of Biological Chemistry

Abstract

Glycosylation of asparagine residues of glycoproteins occurs by the transfer of a glucose3mannose9N-acetylglucosamine2 (Glc3Man9GlcNAc2) oligosaccharide from a lipid carrier to the nascent protein. Normally, this transfer is quickly followed by the stepwise removal of the glucose residues which are arranged in the sequence: Glc1 leads to 2Glc1 leads to 3Glc1 leads to 3Man. We now report studies which demonstrate that a lectin-resistant mutant of the BW5147 mouse lymphoma cell line is deficient in the enzyme which removes the two inner glucose residues. This cell line (PHAR2.7) was selected for resistance to the cytotoxic effects of Phaseolus vulgaris leukoagglutinating lectin (Trowbridge, I. S., Hyman, R., Ferson, T., and Mazauskas, C. (1978) Eur. J. Immunol. 8, 716-723). Glycopeptides prepared from cells equilibrium-labeled with either [2-3H]mannose or [6-3H]galactose were characterized using lectin affinity chromatography, treatment with specific endo- and exoglycosidases, sizing by paper chromatography, and methylation analysis. Approximately 50% of the radioactivity in [3H]mannose-labeled glycopeptides from the mutant cells is present as glucosylated high mannose-type oligosaccharides whereas parent cell glycopeptides labeled under similar conditions lack detectable amounts of these species. Using [3H]galactose labeling, the major glucosylated oligosaccharides were identified as Glc2Man9GlcNAc2 and Glc2Man8GlcNAc2. In vitro enzyme assays demonstrated that the mutant cells cannot remove either of the two inner 1 leads to 3-linked glucose residues. Removal of the outer 1 leads to 3-linked glucose is normal. We conclude from these data that the PHAR2.7 cell line is deficient in glucosidase II, the enzyme which removes the two inner glucose residues from the oligosaccharides of newly glycosylated proteins.

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Crossref · 10.1016/s0021-9258(18)34027-4

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Authors
Reitman, M. L., Trowbridge, I. S., & Kornfeld, S.
Affiliations
  • Washington University in St. Louis (US)
  • Salk Institute for Biological Studies (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1982-09
Volume
257
Issue
17
Pages
10357-10363
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1518996810
Cited by
107
References
34
Citations by year
2022: 1 · 2016: 2 · 2015: 1 · 2014: 2 · 2013: 1
FWCI
3.57
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • The Mouseion at the JAXlibrary (Jackson Laboratory) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glycosylation and Glycoproteins Research
  • Physical Sciences › Chemistry › Organic Chemistry › Carbohydrate Chemistry and Synthesis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
glucosidase II, asparagine-linked glycosylation, N-glycosylation, high-mannose oligosaccharides, lectin resistance, Phaseolus vulgaris lectin, glycoprotein processing, glycopeptide analysis
MeSH terms
alpha-Glucosidases, Animals, Cell Line, Drug Resistance, Glucosidases, Glycopeptides, Glycoproteins, Kinetics, Lymphoma, Mutation, Neoplasms, Experimental, Substrate Specificity, Lectins, Mice

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