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XB-ART-18084
J Neurosci 1996 Jun 15;1612:3925-33. doi: 10.1523/JNEUROSCI.16-12-03925.1996.
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Cloning and functional characterization of a novel dopamine receptor from Drosophila melanogaster.

Feng G , Hannan F , Reale V , Hon YY , Kousky CT , Evans PD , Hall LM .


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A cDNA clone is described that encodes a novel G-protein-coupled dopamine receptor (DopR99B) expressed in Drosophila heads. The DopR99B receptor maps to 99B3-5, close to the position of the octopamine/tyramine receptor gene at 99A10-B1, suggesting that the two may be related through a gene duplication. Agonist stimulation of DopR99B receptors expressed in Xenopus oocytes increased intracellular Ca2+ levels monitored as changes in an endogenous inward Ca2+-dependent chloride current. In addition to initiating this intracellular Ca2+ signal, stimulation of DopR99B increased cAMP levels. The rank order of potency of agonists in stimulating the chloride current is: dopamine &gt; norepinephrine &gt; epinephrine &gt; tyramine. Octopamine and 5-hydroxytryptamine are not active (< 100 microM). This pharmacological profile plus the second-messenger coupling pattern suggest that the DopR99B receptor is a D1-like dopamine receptor. However, the hydrophobic core region of the DopR99B receptor shows almost equal amino acid sequence identity (40-48%) with vertebrate serotonergic, alpha 1- and beta-adrenergic, and D1-like and D2-like dopaminergic receptors. Thus, this Drosophila receptor defines a novel structural class of dopamine receptors. Because DopR99B is the second dopamine receptor cloned from Drosophila, this work establishes dopamine receptor diversity in a system amenable to genetic dissection.

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Genes referenced: camp

References [+] :
Arakawa, Cloning, localization, and permanent expression of a Drosophila octopamine receptor. 1990, Pubmed