Briefly describe the differences between N-linked and O-linked glycosylation

N-linked and O-linked glycosylation are two main types of glycoprotein biosynthesis, playing important roles in various biological processes. Here are the main differences between them:

I. N-linked Glycosylation:

1. This type of glycosylation occurs on asparagine (Asn).

2. It involves a specific sequence, Asn-X-Ser/Thr (X can be any amino acid except proline).

3. N-linked glycosylation begins in the endoplasmic reticulum and is completed in the Golgi apparatus.

II. O-linked Glycosylation:

1. O-linked glycosylation occurs on the oxygen atom of serine (Ser) or threonine (Thr).

2. It does not require a specific sequence pattern.

3. O-linked glycosylation mainly occurs in the Golgi apparatus.

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