title: Specific, efficient, and selective inhibition of prokaryotic translation initiation by a novel peptide antibiotic.
abstract: Many known antibiotics target the translational apparatus, but none of them can selectively inhibit initiation of protein synthesis and/or is prokaryotic-specific. This article describes the properties of GE81112, an effective and prokaryotic-specific initiation inhibitor. GE81112 is a natural tetrapeptide produced by a Streptomyces sp. identified by an in vitro high-throughput screening test developed to find inhibitors of the prokaryotic translational apparatus preferentially acting on steps other than elongation. In vivo GE81112 inhibits protein synthesis but not other cell functions such as DNA duplication, transcription, and cell wall synthesis. In vitro GE81112 was found to target the 30S ribosomal subunit and to interfere with both coded and noncoded P-site binding of fMet-tRNA, thereby selectively inhibiting formation of the 30S initiation complex.
authors.affiliation: Laboratory of Genetics, Department of Biology MCA, University of Camerino, 62032 Camerino (MC), Italy.
authors.forename: Letizia
authors.initials: L
authors.lastname: Brandi
authors.forename: Attilio
authors.initials: A
authors.lastname: Fabbretti
authors.forename: Anna
authors.initials: A
authors.lastname: La Teana
authors.forename: Monica
authors.initials: M
authors.lastname: Abbondi
authors.forename: Daniele
authors.initials: D
authors.lastname: Losi
authors.forename: Stefano
authors.initials: S
authors.lastname: Donadio
authors.forename: Claudio O
authors.initials: CO
authors.lastname: Gualerzi
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D004926:Escherichia coli; D007700:Kinetics; D008156:Luciferases; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009842:Oligopeptides / Q000737:chemistry / Q000494:pharmacology*; D010442:Peptide Chain Initiation, Translational / Q000187:drug effects* / Q000502:physiology; D039662:Prokaryotic Initiation Factors / Q000037:antagonists & inhibitors*; D012358:RNA, Transfer, Met / Q000378:metabolism*; D012270:Ribosomes / Q000378:metabolism; D012588:Scintillation Counting; D013302:Streptomyces / Q000737:chemistry*; D014316:Tritium
chemical_list: D000900:Anti-Bacterial Agents; D009842:Oligopeptides; D039662:Prokaryotic Initiation Factors; D012358:RNA, Transfer, Met; D014316:Tritium; D008156:Luciferases