- Journal Article
Rights / licenseCreative Commons Attribution-NonCommercial 3.0 Unported
A hallmark of N-linked glycosylation in the secretory compartments of eukaryotic cells is the sequential remodeling of an initially uniform oligosaccharide to a site-specific, heterogeneous ensemble of glycostructures on mature proteins. To understand site-specific processing, we used protein disulfide isomerase (PDI), a model protein with five glycosylation sites, for molecular dynamics (MD) simulations and compared the result to a biochemical in vitro analysis with four different glycan processing enzymes. As predicted by an analysis of the accessibility of the N-glycans for their processing enzymes derived from the MD simulations, N-glycans at different glycosylation sites showed different kinetic properties for the processing enzymes. In addition, altering the tertiary structure of the glycoprotein PDI affected its N-glycan remodeling in a site-specific way. We propose that the observed differential N-glycan reactivities depend on the surrounding protein tertiary structure and lead to different glycan structures in the same protein through kinetically controlled processing pathways. Show more
Journal / seriesRSC Chemical Biology
Pages / Article No.
PublisherRoyal Society of Chemistry
Organisational unit09458 - Riniker, Sereina Z. / Riniker, Sereina Z.
162636 - N-linked protein glycosylation: generating diversity (SNF)
182835 - N-linked protein glycosylation (SNF)
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