Page "Golgi apparatus" Paragraph 8

Enzymes within the cisternae are able to modify the proteins by addition of carbohydrates ( glycosylation ) and phosphates ( phosphorylation ).

In order to do so, the Golgi imports substances such as nucleotide sugars from the cytosol.

These modifications may also form a signal sequence which determines the final destination of the protein.

For example, the Golgi apparatus adds a mannose-6-phosphate label to proteins destined for lysosomes.