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  • Title: Mapping the interaction of the STT3 subunit of the oligosaccharyl transferase complex with nascent polypeptide chains.
    Author: Karamyshev AL, Kelleher DJ, Gilmore R, Johnson AE, von Heijne G, Nilsson I.
    Journal: J Biol Chem; 2005 Dec 09; 280(49):40489-93. PubMed ID: 16216884.
    Abstract:
    Many secretory and membrane proteins are N-glycosylated by the oligosaccharyl transferase complex during their translocation across the endoplasmic reticulum membrane. Several experimental observations suggest that the highly conserved STT3 subunit contains the active site of the oligosaccharyl transferase. Here, we report a detailed study of the interaction between the active site of the STT3 protein and nascent polypeptide chains using an in vitro photocrosslinking technique. Our results show that the addition of a glycan moiety in a stretch of approximately 15 residues surrounding a QK(*)T cross-linking site impairs the interaction between the nascent chain and STT3.
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