The DOI matches its Crossref record; 42 of the 42 references it cites were found in a registry or an index.
Cotranslational and Posttranslational N-Glycosylation of Polypeptides by Distinct Mammalian OST Isoforms
Open accessAbstract
Summary Asparagine-linked glycosylation of polypeptides in the lumen of the endoplasmic reticulum is catalyzed by the hetero-oligomeric oligosaccharyltransferase (OST). OST isoforms with different catalytic subunits (STT3A versus STT3B) and distinct enzymatic properties are coexpressed in mammalian cells. Using siRNA to achieve isoform-specific knockdowns, we show that the OST isoforms cooperate and act sequentially to mediate protein N-glycosylation. The STT3A OST isoform is primarily responsible for cotranslational glycosylation of the nascent polypeptide as it enters the lumen of the endoplasmic reticulum. The STT3B isoform is required for efficient cotranslational glycosylation of an acceptor site adjacent to the N-terminal signal sequence of a secreted protein. Unlike STT3A, STT3B efficiently mediates posttranslational glycosylation of a carboxyl-terminal glycosylation site in an unfolded protein. These distinct and complementary roles for the OST isoforms allow sequential scanning of polypeptides for acceptor sites to insure the maximal efficiency of N-glycosylation.
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Cited by
Global view of human protein glycosylation pathways and functions
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Metadata
- Authors
- Ruiz-Canada, C., Kelleher, D. J., & Gilmore, R.
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2009-01
- Volume
- 136
- Issue
- 2
- Pages
- 272-283
- ISSN
- 0092-8674 (ISSN-L)
- OpenAlex
- W2106203560
- Cited by
- 391
- References
- 42
- FWCI
- 7.20
- Type
- journal article
- Language
- en
- Open access
- bronze
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