A protein to be secreted from the cell is most likely to have

A protein to be secreted from the cell usually has a hydrophobic region at its amino terminus, which causes the ribosome synthesizing that protein to become bound to the endoplasmic reticulum. The protein molecule enters the endoplasmic reticulum as it is being made. The signal sequence is cleaved off by the signal peptidase and carbohydrate residues are attached inside the endoplasmic reticulum. Additional carbohydrate residues are attached as the protein moves through the Golgi apparatus on its way to the outside of the cell. Proteins that are destined for the lysosomes are marked by the addition of mannose-6-phosphate. Ref : Biochemistry by U. Satyanarayana 3rd edition Pgno : 553