Identification of a novel aminergic-like G protein-coupled receptor in the cnidarian Renilla koellikeri.
Biogenic amines exert various physiological effects in cnidarians, but the receptors involved in these responses are not known. We have cloned a novel G protein-coupled receptor cDNA from an anthozoan, the sea pansy Renilla koellikeri, that shows homology to mammalian catecholamine receptors and, to a lesser extent, to peptidergic receptors. This putative receptor, named Ren2, has a DRC pattern that replaces the well-conserved DRY motif on the cytoplasmic side of the transmembrane III and lacks the cysteine residues usually found in the second extracellular loop and C-terminus tail. Both the second extracellular loop and the N-terminal tail were seen to be short (six and three amino acids, respectively). Northern blot analysis suggests that the receptor gene codes for two transcripts. Localization of these transcripts by in situ hybridization demonstrated abundant expression in the epithelium of the pharyngeal wall, the oral disk and tentacles as well as in the endodermal epithelium lining the gastrovascular cavities.
Département de sciences biologiques, Université de Montréal, C.P. 6128, Succ. Centreville, Montréal, Québec, Canada H3C 3J7.
Christelle
C
Bouchard
Paula
P
Ribeiro
François
F
Dubé
Christian
C
Demers
Michel
M
Anctil
D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D017403:In Situ Hybridization; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D043562:Receptors, G-Protein-Coupled / Q000235:genetics*; D048790:Renilla / Q000235:genetics*; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
D018076:DNA, Complementary; D012333:RNA, Messenger; D043562:Receptors, G-Protein-Coupled