title: A Drosophila gene structurally and functionally homologous to the mammalian 70-kDa s6 kinase gene.
abstract: cDNAs encoding the Drosophila 70-kDa S6 kinase (S6K) were isolated by low-stringency hybridization with mammalian p70S6k probes. Conceptual translation of S6k cDNA sequences yields a product containing all of the canonical features typical of serine/threonine kinases and has 78% amino acid identity in the catalytic domain with the human p70S6k homologue. The S6k gene, located at polytene chromosome site 65D, gives rise to two predominant transcripts of 3.0 and 5.0 kb and at least two smaller transcripts (< 3.0 kb) that are found in whole-animal RNAs at all stages of development. Blood cells derived from the hematopoietic organs of ribosomal protein S6 (RpS6air8) mutant animals express higher levels of the smaller S6k transcripts, suggesting tissue- or genotype-specific differences in the regulation of the S6k gene. Drosophila S6K expressed in COS or NIH 3T3 cells phosphorylates mammalian RPS6 in a mitogen-dependent wortmannin- and rapamycin-sensitive manner, suggesting that its regulation is similiar to mammalian p70S6k.
authors.affiliation: Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA. kwatson@hubio2.harvard.edu
authors.forename: K L
authors.initials: KL
authors.lastname: Watson
authors.forename: M M
authors.initials: MM
authors.lastname: Chou
authors.forename: J
authors.initials: J
authors.lastname: Blenis
authors.forename: W M
authors.initials: WM
authors.lastname: Gelbart
authors.forename: R L
authors.initials: RL
authors.lastname: Erikson
mesh_terms: D016475:3T3 Cells; D000595:Amino Acid Sequence; D000730:Androstadienes / Q000494:pharmacology; D000818:Animals; D019556:COS Cells; D004330:Drosophila / Q000196:embryology / Q000201:enzymology* / Q000235:genetics*; D004625:Embryo, Nonmammalian; D004791:Enzyme Inhibitors / Q000494:pharmacology; D018507:Gene Expression Regulation, Developmental; D015971:Gene Expression Regulation, Enzymologic; D017344:Genes, Insect; D006801:Humans; D008322:Mammals; D051379:Mice; D008969:Molecular Sequence Data; D011090:Polyenes / Q000494:pharmacology; D017346:Protein Serine-Threonine Kinases / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics*; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry; D019893:Ribosomal Protein S6 Kinases; D017386:Sequence Homology, Amino Acid; D020123:Sirolimus; D014162:Transfection; D000077191:Wortmannin
chemical_list: D000730:Androstadienes; D004791:Enzyme Inhibitors; D011090:Polyenes; D011994:Recombinant Proteins; D017346:Protein Serine-Threonine Kinases; D019893:Ribosomal Protein S6 Kinases; D020123:Sirolimus; D000077191:Wortmannin