[EN] BISAMINOQUINOLINES AND BISAMINOACRIDINES COMPOUNDS AND METHODS OF THEIR USE [FR] COMPOSÉS BISAMINOQUINOLINES ET BISAMINOACRIDINES ET LEURS MÉTHODES D'UTILISATION
Development of a multifunctional aminoxy-based fluorescent linker for glycan immobilization and analysis
作者:Carmen Jiménez-Castells、Rhiannon Stanton、Shi Yan、Paul Kosma、Iain BH Wilson
DOI:10.1093/glycob/cww051
日期:——
moiety for the immobilization onto solid supports. Several glycoconjugates displaying small sugar epitopes via chemical or chemoenzymaticsynthesis were covalently attached onto a microarray support and tested with lectins of known carbohydrate binding specificity. The glycan library was extended using glycosyltransferases (e.g. galactosyl-, sialyl- and fucosyltransferases); the resulting neoglycoconjugates
Site-Selective Synthetic Acylation of a Target Protein in Living Cells Promoted by a Chemical Catalyst/Donor System
作者:Wataru Hamajima、Akiko Fujimura、Yusuke Fujiwara、Kenzo Yamatsugu、Shigehiro A. Kawashima、Motomu Kanai
DOI:10.1021/acschembio.9b00102
日期:2019.6.21
reported that a chemical catalyst (DSH) conjugated with a nucleosome-binding ligand can activate an acyl-CoA and promote site-selective lysine acylation of histones in test tubes. In-cell acylation by this catalyst system is challenging, however, mainly due to the low cell permeability of acyl-CoA and the propensity of DSH to form inactive disulfide. Here, we report a newcatalyst system effective for
Flavin as a photo-active acceptor for efficient energy and charge transfer in a model donor–acceptor system
作者:Xi Yu、Serkan Eymur、Vijay Singh、Boqian Yang、Murat Tonga、Amarnath Bheemaraju、Graeme Cooke、Chandramouleeswaran Subramani、Dhandapani Venkataraman、Robert J. Stanley、Vincent M. Rotello
DOI:10.1039/c2cp40073a
日期:——
A donorâacceptor dyad model system using a flavin moiety as a photo-active acceptor has been synthesized for an energy and photo-induced electron transfer study. The photophysical investigations of the dyad revealed a multi-path energy and electron transfer process with a very high transfer efficiency. The photo-activity of flavin was believed to play an important role in the process, implying the potential application of flavin as a novel acceptor molecule for photovoltaics.
A series of new hybrid structures containing fluoroquinolone (ciprofloxacin) and aminoglycoside (neomycin) antibiotics linked via 1,2,3-triazole moiety were designed and synthesized, and their antibacterial activities were determined against both Gram-negative and Gram-positive bacteria, including resistant strains. The nature of spacers in both the ciprofloxacin and neomycin parts greatly influenced the antibacterial activity. The majority of hybrids was significantly more potent than the parent neomycin and overcame most prevalent types of resistance associated with aminoglycosides. Selected hybrids inhibited bacterial protein synthesis with the potencies similar to or better than that of neomycin and were up to 32-fold more potent inhibitors than ciprofloxacin for the fluoroquinolone targets, DNA gyrase and toposiomerase IV, indicating a balanced dual mode of action. Significant delay of resistance formation was observed in both E. coli and B. subtilis to the treatment with ciprofloxacin-neomycin hybrid in comparison to that of each drug separately or their 1: 1 mixture.
Conjugated antimicrobial agents
申请人:Technion Research & Development Foundation Limited
公开号:US09149536B2
公开(公告)日:2015-10-06
Provided herein are antimicrobial conjugates of two antibiotic agents, exhibiting improved activity also against resistant bacteria, compared to each of the agents separately or their mixture, and having substantially no resistance emerged thereagainst, as well as processes for preparation the same, compositions containing the same, and uses thereof in medical treatments against pathogenic microorganisms. The disclosed antimicrobial conjugates are composed of aminoglycosides and non-ribosomal active antibiotics. Some of the antimicrobial conjugates are prepared via “click” chemistry.