title: Protein synthesis inhibitory activity in culture filtrates from new strains of Streptomyces isolated from Brazilian tropical soils.
abstract: OBJECTIVE
  To investigate the effect of the culture supernatants from three newly isolated Streptomyces strains, 221, 235 and 606 on eukaryotic cells.
  
  
  RESULTS
  Cell lines were treated with the culture filtrates and assayed for protein synthesis by metabolic labelling, followed by sodium dodecyl sulphate-polyacrylamide gel electrophoresis analysis. RNA synthesis was investigated by [5-3H]uridine incorporation. The three culture filtrates presented a strong inhibitory activity, reducing total protein synthesis of different eukaryotic cell lines by more than 85%. No effect on cellular RNA synthesis was detected. The culture filtrates did not affect the growth of the prokaryotic cells tested.
  
  
  CONCLUSIONS
  These new Streptomyces strains, recently isolated from Brazilian tropical soils, produce molecule(s) with inhibitory activity specific to eukaryote protein synthesis.
  
  
  CONCLUSIONS
  Streptomyces strains 221, 235 and 606, probably representing new species, might produce new bioactive compound(s), and can be used as valuable tools to study the protein synthesis pathway in eukaryotes.
authors.affiliation: Laboratório de Biologia Molecular de Vírus, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: S A
authors.initials: SA
authors.lastname: Reis
authors.forename: L V
authors.initials: LV
authors.lastname: Costa
authors.forename: E D C
authors.initials: ED
authors.lastname: Cavalcanti
authors.forename: M
authors.initials: M
authors.lastname: Giambiagi-deMarval
authors.forename: L T A S
authors.initials: LT
authors.lastname: Semêdo
authors.forename: R R R
authors.initials: RR
authors.lastname: Coelho
authors.forename: N
authors.initials: N
authors.lastname: Moussatché
authors.forename: C R A
authors.initials: CR
authors.lastname: Damaso
mesh_terms: D016475:3T3 Cells; D000818:Animals; D001938:Brazil; D002460:Cell Line; D003470:Culture Media; D006801:Humans; D051379:Mice; D014176:Protein Biosynthesis / Q000187:drug effects; D011500:Protein Synthesis Inhibitors / Q000302:isolation & purification / Q000378:metabolism* / Q000494:pharmacology; D012313:RNA / Q000096:biosynthesis; D012988:Soil Microbiology; D013302:Streptomyces / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D014329:Tropical Climate
chemical_list: D003470:Culture Media; D011500:Protein Synthesis Inhibitors; D012313:RNA