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- ************************
- * N-glycosylation site *
- ************************
-
- It has been known for a long time [1] that potential N-glycosylation sites are
- specific to the consensus sequence Asn-Xaa-Ser/Thr. It must be noted that the
- presence of the consensus tripeptide is not sufficient to conclude that an
- asparagine residue is glycosylated, due to the fact that the folding of the
- protein plays an important role in the regulation of N-glycosylation [2]. It
- has been shown [3] that the presence of proline between Asn and Ser/Thr will
- inhibit N-glycosylation; this has been confirmed by a recent [4] statistical
- analysis of glycosylation sites, which also shows that about 50% of the sites
- that have a proline C-terminal to Ser/Thr are not glycosylated.
-
- It must also be noted that there are a few reported cases of glycosylation
- sites with the pattern Asn-Xaa-Cys; an experimentally demonstrated occurrence
- of such a non-standard site is found in the plasma protein C [5].
-
- -Consensus pattern: N-{P}-[ST]-{P}
- [N is the glycosylation site]
- -Last update: May 1991 / Text revised.
-
- [ 1] Marshall R.D.
- Annu. Rev. Biochem. 41:673-702(1972).
- [ 2] Pless D.D., Lennarz W.J.
- Proc. Natl. Acad. Sci. U.S.A. 74:134-138(1977).
- [ 3] Bause E.
- Biochem. J. 209:331-336(1983).
- [ 4] Gavel Y., von Heijne G.
- Protein Eng. 3:433-442(1990).
- [ 5] Miletich J.P., Broze G.J. Jr.
- J. Biol. Chem. 265:11397-11404(1990).
-