Asparagine-linked glycosylation

Molecular analysis of the opioid receptors indicates that they conform to the structural motif of the G protein receptor family. All three types of opioid receptors contain cysteine residues believed to be involved in disulfide bonds, and a cysteine fatty acid attachment site in locations common with other G protein-coupled receptors. All three opioid receptors contain consensus asparagine-linked glycosylation sites in the extracellular N-terminal domain as well as many consensus protein kinase sites in the first and third intracellular loops, and in the C-terminal domain. 

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