The ER protein folding sensor UDP-glucose glycoprotein–glucosyltransferase modifies substrates distant to local changes in glycoprotein conformation View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2004-01-04

AUTHORS

Sean C Taylor, Andrew D Ferguson, John J M Bergeron, David Y Thomas

ABSTRACT

We present in vitro data that explain the recognition mechanism of misfolded glycoproteins by UDP-glucose glycoprotein–glucosyltransferase (UGGT). The glycoprotein exo-(1,3)-β-glucanase (β-Glc) bearing two glycans unfolds in a pH-dependent manner to become a misfolded substrate for UGGT. In the crystal structure of this glycoprotein, the local hydrophobicity surrounding each glycosylation site coincides with the differential recognition of N-linked glycans by UGGT. We introduced a single F280S point mutation, producing a β-Glc protein with full enzymatic activity that was both recognized as misfolded and monoglucosylated by UGGT. Contrary to current views, these data show that UGGT can modify N-linked glycans positioned at least 40 Å from localized regions of disorder and sense subtle conformational changes within structurally compact, enzymatically active glycoprotein substrates. More... »

PAGES

128-134

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nsmb715

DOI

http://dx.doi.org/10.1038/nsmb715

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1052668511

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/14730348


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