Molecular characterization of a second melatonin receptor expressed in human retina and brain: the Mel1b melatonin receptor.

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Reppert SM, Godson C, Mahle CD, Weaver DR, Slaugenhaupt SA, Gusella JF

Molecular characterization of a second melatonin receptor expressed in human retina and brain: the Mel1b melatonin receptor.

Proc Natl Acad Sci U S A. 1995 Sep 12;92(19):8734-8.

PubMed ID
7568007 [ View in PubMed
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Abstract

A G protein-coupled receptor for the pineal hormone melatonin was recently cloned from mammals and designated the Mel1a melatonin receptor. We now report the cloning of a second G protein-coupled melatonin receptor from humans and designate it the Mel1b melatonin receptor. The Mel1b receptor cDNA encodes a protein of 362 amino acids that is 60% identical at the amino acid level to the human Mel1a receptor. Transient expression of the Mel1b receptor in COS-1 cells results in high-affinity 2-[125I]iodomelatonin binding (Kd = 160 +/- 30 pM). In addition, the rank order of inhibition of specific 2-[125I]iodomelatonin binding by eight ligands is similar to that exhibited by the Mel1a melatonin receptor. Functional studies of NIH 3T3 cells stably expressing the Mel1b melatonin receptor indicate that it is coupled to inhibition of adenylyl cyclase. Comparative reverse transcription PCR shows that the Mel1b melatonin receptor is expressed in retina and, to a lesser extent, brain. PCR analysis of human-rodent somatic cell hybrids maps the Mel1b receptor gene (MTNR1B) to human chromosome 11q21-22. The Mel1b melatonin receptor may mediate the reported actions of melatonin in retina and participate in some of the neurobiological effects of melatonin in mammals.

DrugBank Data that Cites this Article

Polypeptides
NameUniProt ID
Melatonin receptor type 1BP49286Details
Binding Properties
DrugTargetPropertyMeasurementpHTemperature (°C)
AgomelatineMelatonin receptor type 1BKi (nM)0.23N/AN/ADetails
MelatoninMelatonin receptor type 1BKi (nM)1.11N/AN/ADetails