title: Characterization of a functionally expressed dipeptidyl aminopeptidase III from Drosophila melanogaster.
abstract: A Drosophila melanogaster cDNA clone (GH01916) encoding a putative 723-residue long (82 kDa) protein (CG 7415) and displaying 50% identity with mammalian cytosolic dipeptidyl aminopeptidase (DPP) III was functionally expressed in Schneider S2 cells. Immunocytochemical studies using anti-(rat liver DPP III) Ig indicated the expression of this putative DPP III at the outer cell membrane and into the cytosol of transfected cells. Two protein bands (82 and 86 kDa) were immunologically detected after PAGE and Western blot of cytosol or membrane prepared from transfected cells. Western blot analysis of partially purified D. melanogaster DPP III confirmed the overexpression of these two protein bands into the cytosol and on the membranes of transfected cells. Despite the identification of six potential glycosylation sites, PAGE showed that these protein bands were not shifted after deglycosylation experiments. The partially purified enzyme hydrolysed the insect myotropic neuropeptide proctolin (Arg-Tyr-Leu-Pro-Thr) at the Tyr-Leu bond (Km approximately 4 micro m). In addition, low concentration of the specific DPP III inhibitor tynorphin prevented proctolin degradation (IC50 = 0.62 +/- 0.15 micro m). These results constitute the first characterization of an evolutionarily conserved insect DPP III that is expressed as a cytosolic and a membrane peptidase involved in proctolin degradation.
authors.affiliation: Laboratoire des Régulations Neuroendocriniennes, Université Bordeaux I, Talence, France.
authors.forename: Claire
authors.initials: C
authors.lastname: Mazzocco
authors.forename: Kayoko M
authors.initials: KM
authors.lastname: Fukasawa
authors.forename: Patrick
authors.initials: P
authors.lastname: Auguste
authors.forename: Jacques
authors.initials: J
authors.lastname: Puiroux
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism; D003001:Cloning, Molecular; D003600:Cytosol / Q000378:metabolism; D018076:DNA, Complementary / Q000235:genetics; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000201:enzymology* / Q000235:genetics; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005822:Genetic Vectors; D006031:Glycosylation; D006868:Hydrolysis; D007150:Immunohistochemistry / Q000379:methods; D008969:Molecular Sequence Data; D009479:Neuropeptides; D009842:Oligopeptides / Q000378:metabolism / Q000494:pharmacology; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D014162:Transfection
chemical_list: D018076:DNA, Complementary; D004791:Enzyme Inhibitors; D009479:Neuropeptides; D009842:Oligopeptides; D011994:Recombinant Proteins; C412863:tynorphin; C011536:proctolin; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; C100152:dipeptidyl peptidase III