In N-linked glycoproteins, the sugar is usually attached to the protein by a bond to the N atom in a side-chain amide.
Which of the following amino acids can form such a bond?
Lysine
Phenylalanine
Tyrosine
Asparagine
Glycine
Proline
Glutamine
Leucine

Question

In N-linked glycoproteins, the sugar is usually attached to the protein by a bond to the N atom in a side-chain amide.
Which of the following amino acids can form such a bond?
	Lysine
	Phenylalanine
	Tyrosine
	Asparagine
	Glycine
	Proline
	Glutamine
	Leucine

aaronq · Answer

If amino acids are bound to each other in a protein (through amide bonds) then the side chains are the only the side groups (R) of each amino acid are available. Which of these have carboxamide side chains?