Editing Glycoprotein (section)

==Types of glycosylation==
There are several types of glycosylation, although the first two are the most common.
* In [[N-linked glycosylation|''N''-glycosylation]], sugars are attached to nitrogen, typically on the [[amide]] side-chain of [[asparagine]].
* In [[O-linked glycosylation|''O''-glycosylation]], sugars are attached to oxygen, typically on [[serine]] or [[threonine]], but also on [[tyrosine]] or non-canonical amino acids such as [[hydroxylysine]] and [[hydroxyproline]].
* In [[P-linked glycosylation|''P''-glycosylation]], sugars are attached to [[phosphorous acid|phosphorus]] on a [[phosphoserine]].
* In [[C-linked glycosylation|''C''-glycosylation]], sugars are attached directly to carbon, such as in the addition of [[mannose]] to [[tryptophan]].
* In [[S-linked glycosylation|''S''-glycosylation]], a beta-[[GlcNAc]] is attached to the sulfur atom of a [[cysteine]] residue.<ref>{{cite journal |vauthors=Stepper J, Shastri S, Loo TS, Preston JC, Novak P, Man P, Moore CH, Havlíček V, Patchett ML, Norris GE |display-authors=6 |title=Cysteine S-glycosylation, a new post-translational modification found in glycopeptide bacteriocins |journal=FEBS Letters |volume=585 |issue=4 |pages=645–650 |date=February 2011 |pmid=21251913 |doi=10.1016/j.febslet.2011.01.023 |s2cid=29992601 |doi-access=}}</ref>
* In [[glypiation]], a [[Glycophosphatidylinositol|GPI]] glycolipid is attached to the [[C-terminus]] of a [[polypeptide]], serving as a membrane anchor.
* In [[glycation]], also known as non-enzymatic glycosylation, sugars are covalently bonded to a protein or lipid molecule, without the controlling action of an enzyme, but through a [[Maillard reaction]].