title: Inhibitory action of a new proton pump inhibitor, trifluoromethyl ketone derivative, against the motility of clarithromycin-susceptible and-resistant Helicobacter pylori.
abstract: We previously reported that a trifluoromethyl ketone derivative, 1-(2-benzoxazolyl)-3,3,3-trifluoro-2-propanone (TF18), exhibited the potent antibacterial activity against Helicobacter pylori, but had no urease activity. In order to clarify the mechanism of anti-H. pylori action of TF18, we evaluated the growth and motility of TF18 on clarithromycin-susceptible H. pylori (CSHP) and -resistant H. pylori (CRHP). An effective proton pump inhibitor (TF18) had remarkable dose-dependent antibacterial activity and was able to inhibit the flagellar motor of both CSHP and CRHP isolates. The antimotility effect of TF18 was more pronounced at subinhibitory concentration in CRHP than in CSHP. The swimming (the forward motion) was more sensitive to the inhibition than the tumbling. Based on the results, it is supposed that TF18 works as an uncoupler similar to the 'clutch' in a biological motor, in which counterclockwise rotation is more sensitive to the effect of TF18 than the clockwise rotation.
authors.affiliation: Department of Medical Microbiology and Immunobiology, Albert Szent-Györgyi Medical Centre, Faculty of Medicine, University of Szeged, Szeged, Hungary.
authors.forename: Gabriella
authors.initials: G
authors.lastname: Spengler
authors.forename: Annamaria
authors.initials: A
authors.lastname: Molnar
authors.forename: Gergely
authors.initials: G
authors.lastname: Klausz
authors.forename: Yvette
authors.initials: Y
authors.lastname: Mandi
authors.forename: Masami
authors.initials: M
authors.lastname: Kawase
authors.forename: Noboru
authors.initials: N
authors.lastname: Motohashi
authors.forename: Joseph
authors.initials: J
authors.lastname: Molnar
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001583:Benzoxazoles / Q000494:pharmacology*; D017291:Clarithromycin / Q000494:pharmacology; D024881:Drug Resistance, Bacterial; D005407:Flagella / Q000187:drug effects; D016480:Helicobacter pylori / Q000187:drug effects* / Q000254:growth & development / Q000502:physiology; D007659:Ketones / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D009068:Movement / Q000187:drug effects; D011407:Propane / Q000031:analogs & derivatives* / Q000494:pharmacology*; D054328:Proton Pump Inhibitors
chemical_list: C495691:1-(2-benzoxazolyl)-3,3,3-trifluoro-2-propanone; D000900:Anti-Bacterial Agents; D001583:Benzoxazoles; D007659:Ketones; D054328:Proton Pump Inhibitors; D017291:Clarithromycin; D011407:Propane