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Molecular cloning and expression of a δ‐opioid recetpor from rat brain

We have isolated and characterized a rat δ‐opioid receptor. The deduced amino acid sequence (372 aa) closely resembles the murine δ‐opioid receptor, DOR‐1. In fact, 97% of the amino acid residues are conserved between the two species, while 93% of the nucleic acid residues are identical. A 6 kb mRNA was detected in rat cortex using rat DOR‐1 as a probe. When expressed in COS cells, the clone shows high‐affinity opioid binding with selectivity for δ‐opioids. The rat δ‐opioid receptor cDNA clone will be a useful tool for studying the function of δ‐opioid receptor in rats. Wiley‐Liss, Inc.