Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 275, Issue 23, Pages 17338-17343Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M002317200
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Statistical studies of N-glycosylated proteins have indicated that the frequency of nonglycosylated Asn-Xaa-(Thr/Ser) sequons increases toward the C terminus (Gavel, Y., and von Heijne, G. (1990) Protein Eng. 3, 433-442), Using in vitro transcription/translation of a truncated model protein in the presence of dog pancreas microsomes, we find that glycosylation efficiency of Asn-Xaa-Thr sequons indeed is reduced when the sequon is within similar to 60 residues of the C terminus. Surprisingly, the presence of a hydrophobic stop transfer sequence between the Asn-Xaa-Thr sequon and the C terminus results in a very different dependence of glycosylation efficiency on the distance to the C terminus, where the presence of the stop transfer segment inside the ribosome appears to cause a drastic drop in the level of glycosylation. We speculate that this may reflect a change in the structure of the ribosome/translocon complex induced by the stop transfer segment.
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