Identification of a potent small-molecule inhibitor of bacterial DNA repair that potentiates quinolone antibiotic activity in methicillin-resistant Staphylococcus aureus
摘要:
The global emergence of antibiotic resistance is one of the most serious challenges facing modern medicine. There is an urgent need for validation of new drug targets and the development of small molecules with novel mechanisms of action. We therefore sought to inhibit bacterial DNA repair mediated by the AddAB/RecBCD protein complexes as a means to sensitize bacteria to DNA damage caused by the host immune system or quinolone antibiotics. A rational, hypothesis-driven compound optimization identified IMP-1700 as a cell-active, nanomolar potency compound. IMP-1700 sensitized multidrug-resistant Staphylococcus aureus to the fluoroquinolone antibiotic ciprofloxacin, where resistance results from a point mutation in the fluoroquinolone target, DNA gyrase. Cellular reporter assays indicated IMP-1700 inhibited the bacterial SOS-response to DNA damage, and compoundfunctionalized Sepharose successfully pulled-down the AddAB repair complex. This work provides validation of bacterial DNA repair as a novel therapeutic target and delivers IMP-1700 as a tool molecule and starting point for therapeutic development to address the pressing challenge of antibiotic resistance.
Identification of a potent small-molecule inhibitor of bacterial DNA repair that potentiates quinolone antibiotic activity in methicillin-resistant Staphylococcus aureus
摘要:
The global emergence of antibiotic resistance is one of the most serious challenges facing modern medicine. There is an urgent need for validation of new drug targets and the development of small molecules with novel mechanisms of action. We therefore sought to inhibit bacterial DNA repair mediated by the AddAB/RecBCD protein complexes as a means to sensitize bacteria to DNA damage caused by the host immune system or quinolone antibiotics. A rational, hypothesis-driven compound optimization identified IMP-1700 as a cell-active, nanomolar potency compound. IMP-1700 sensitized multidrug-resistant Staphylococcus aureus to the fluoroquinolone antibiotic ciprofloxacin, where resistance results from a point mutation in the fluoroquinolone target, DNA gyrase. Cellular reporter assays indicated IMP-1700 inhibited the bacterial SOS-response to DNA damage, and compoundfunctionalized Sepharose successfully pulled-down the AddAB repair complex. This work provides validation of bacterial DNA repair as a novel therapeutic target and delivers IMP-1700 as a tool molecule and starting point for therapeutic development to address the pressing challenge of antibiotic resistance.
[EN] NOVEL 14 AND 15 MEMBERED-RING COMPOUNDS<br/>[FR] NOUVEAUX COMPOSES A CYCLES A 14 ET 15 ELEMENTS
申请人:GLAXO GROUP LTD
公开号:WO2004101590A1
公开(公告)日:2004-11-25
The present invention relates to 15-membered macrolides substituted at the 4' position of formula (I) and pharmaceutically acceptable derivatives thereof, to processes for their preparation and their use in therapy or prophylaxis of systemic or topical microbial infections in a human or animal body.
Developing ciprofloxacin analogues against plant DNA gyrase: a novel herbicide mode of action
作者:Michael D. Wallace、Nidda F. Waraich、Aleksandra W. Debowski、Maxime G. Corral、Anthony Maxwell、Joshua S. Mylne、Keith A. Stubbs
DOI:10.1039/c7cc09518j
日期:——
The development of ciprofloxacin analogues against plant DNA gyrase, a novel herbicidal target, with increased herbicidal activity and diminished antibacterial activity is described.
Synthesis and activity of new macrolones: Conjugates between 6(7)-(2′-aminoethyl)-amino-1-cyclopropyl-3-carboxylic acid (2′-hydroxyethyl) amides and 4″-propenoyl-azithromycin
A set of novel macrolones containing the flexible C8 basic linker and quinolone 3-(2 '-hydroxyethyl)carboxamido group has been prepared and structurally characterized by NMR and IR spectroscopy, mass spectrometry and molecular modeling. The new compounds were evaluated in vitro against a panel of erythromycin-susceptible and erythromycin-resistant Gram-positive and Gram-negative bacterial strains. Compared to azithromycin, most of the compounds exhibited improved in vitro potency against the key respiratory pathogens. (C) 2011 Elsevier Ltd. All rights reserved.
4″-O-(ω-Quinolylamino-alkylamino)propionyl derivatives of selected macrolides with the activity against the key erythromycin resistant respiratory pathogens
Four macrolides-6-O-methyl-8a-aza-8a-homoerythromycin, clarithromycin, azithromycin and azithromycin 11,12-cyclic carbonate, have been selected for the construction of a series of new quinolone derivatives. The quinolone moiety is connected to the macrolide scaffold via a diaminoaklyl 4"-O-propionyl ester chain of varying length. At the terminus the linker is attached via one of the nitrogen atoms in the linker at C(6) or C(7) of the quinolone. Many of compounds described, particularly clarithromycin derivative 37, and azithromycin derivatives 48 and 55, exhibited excellent antibacterial activity against a wide range of clinically relevant macrolide-resistant organisms, with profiles superior to that of telithromycin, an enhanced spectrum ketolide. (C) 2010 Elsevier Ltd. All rights reserved.
14 OR 15 MEMBERED MACROLIDES WITH ANTIBACTERIAL ACTIVITY