title: Systematic G-protein-coupled receptor analysis in Drosophila melanogaster identifies a leucokinin receptor with novel roles.
abstract: Leucokinins are insect neuropeptides that stimulate hindgut motility and renal fluid secretion. Drosophila has a single leucokinin gene, pp, encoding the longest known leucokinin, Drosokinin. To identify its receptor, a genome-wide scan for G-protein-coupled receptors was performed in silico and candidate receptors identified by similarity to known tachykinin receptors. The deduced peptides were expressed, with a transgene for the calcium reporter aequorin, in S2 cells and only one gene (CG10626) encoded a protein that responded to Drosokinin. The properties of the heterologously expressed receptor (action through intracellular calcium with an EC(50) of 4 x 10(-11) m and a t(1/2) <1 s) match closely those reported for the action of Drosokinin on Malpighian (renal) tubules. Antibodies raised against the receptor identified known sites of leucokinin action: stellate cells of the Malpighian tubule, two triplets of cells in the pars intercerebralis of the adult central nervous system, and additional cells in larval central nervous system. Western blots and reverse transcription-PCR confirmed these locations, but also identified expression in male and female gonads. These tissues also displayed elevated calcium in response to Drosokinin, demonstrating novel roles for leucokinin. A functional genomic approach has thus yielded the first complete characterization of a leucokinin receptor in an insect.
authors.affiliation: Division of Molecular Genetics, Institute of Biomedical & Life Sciences, University of Glasgow, Glasgow G11 6NU, United Kingdom.
authors.forename: Jonathan C
authors.initials: JC
authors.lastname: Radford
authors.forename: Shireen A
authors.initials: SA
authors.lastname: Davies
authors.forename: Julian A T
authors.initials: JA
authors.lastname: Dow
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002118:Calcium / Q000378:metabolism; D029721:Drosophila Proteins / Q000145:classification / Q000235:genetics / Q000378:metabolism; D004331:Drosophila melanogaster / Q000235:genetics / Q000378:metabolism*; D004625:Embryo, Nonmammalian / Q000033:anatomy & histology / Q000502:physiology; D005260:Female; D019204:GTP-Binding Proteins / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D017344:Genes, Insect; D017930:Genes, Reporter; D006801:Humans; D008297:Male; D008317:Malpighian Tubules / Q000166:cytology / Q000378:metabolism; D008969:Molecular Sequence Data; D009420:Nervous System / Q000166:cytology / Q000378:metabolism; D009479:Neuropeptides / Q000378:metabolism*; D011956:Receptors, Cell Surface / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D018013:Receptors, Neuropeptide / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D019076:Transgenes
chemical_list: D029721:Drosophila Proteins; C468143:Lk protein, Drosophila; D009479:Neuropeptides; D011956:Receptors, Cell Surface; D018013:Receptors, Neuropeptide; C468144:drosokinin receptor; D019204:GTP-Binding Proteins; D002118:Calcium