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Genetic and Chemical Targeting of the Gram-Negative Outer Membrane to Potentiate Large-Scaffold Antibiotics / GENETIC AND CHEMICAL TARGETING OF THE OUTER MEMBRANEKlobucar, Kristina January 2022 (has links)
The outer membrane (OM) is a formidable barrier that has made antibiotic drug discovery in Gram-negatives exceedingly difficult. Many antibiotics which are effective against Gram-positive bacteria cannot permeate the Gram-negative OM to reach their intracellular targets. Thus, it is important to explore unconventional approaches to overcome the intrinsic resistance conferred by the OM. Herein, we used both genetic and chemical means to compromise OM integrity to potentiate the activity of large-scaffold antibiotics against Escherichia coli. First, we mapped the genetic interaction network of OM biosynthetic genes using synthetic genetic arrays (SGAs) to reveal permeability determinants of the E. coli OM. This led to the creation of a publicly accessible dataset of ~155,400 double deletion strains with growth data in the presence of the large-scaffold antibiotics rifampicin and vancomycin. Investigations of a subset of synthetic sick interactions revealed connectivity in the context of permeability between lipopolysaccharide (LPS) inner core biosynthetic genes and an enigmatic gene involved in enterobacterial common antigen (ECA) regulation. Second, we leveraged a chemical screening platform based on the observation that disruption of the E. coli OM leads to antagonism of vancomycin activity at cold temperatures to uncover molecules that potentiate Gram-positive-targeting antibiotics at 37 ºC. Two of these compounds, liproxstatin-1 and MAC-0568743, were characterized to bind to LPS and disrupt OM integrity specifically without impacting the inner membrane (IM). Third, we performed genetic and chemical screening to unearth targets capable of potentiating the activity of Gram-positive-targeting antibiotics against E. coli. This validated the OM as a valuable target for antibiotic adjuvants and led to the discovery of two membrane active compounds and an inhibitor of lipid A biosynthesis. Overall, this thesis emphasizes the importance of elucidating biological factors contributing to OM permeability and the attractiveness of the OM as a target for antibiotic potentiators. / Thesis / Doctor of Philosophy (PhD)
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A study of the stability and release of selected antibiotics from cation-saturated bentonites /Danti, August Gabriel January 1955 (has links)
No description available.
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Heat induced inhibitory agents obtained from processed fruits and vegetables /Wilson, Dorothy Culler January 1952 (has links)
No description available.
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Differential disease development as a measure of entrance and movement of a fungicide within cucumber seedlings /Metz, Robert Winfield January 1959 (has links)
No description available.
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Effect of antecedent and immediate environment on a species of cephalosporium producing an antibiotic /Smith, Glenn Edward January 1960 (has links)
No description available.
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Studies on the biosynthesis of the modified-peptide antibiotic, nosiheptide /Houck, David Renwick, 1956- January 1986 (has links)
No description available.
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Part I: Synthesis of carbapenems and aminosaccharides ; Part II: Studies toward a synthesis of gelsemine /Ha, Deok-Chan January 1987 (has links)
No description available.
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Use of antibiotics in the processing and preservation of fresh beef /Goldberg, Herbert S. January 1953 (has links)
No description available.
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Antimicrobial agents from Thalictrum rugosum ait. (T. glaucum desf.) /Wu, Wu-nan January 1972 (has links)
No description available.
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Chemical ionization mass spectrometry of macrolide antibiotics, [beta]-lactam antibiotics, and model compounds ; . Antimicrobial agents from highter plants. Isolation of canthin-6-one from Zanthoxylum elephantiasis and... /Showalter, Howard Daniel Hollis January 1974 (has links)
No description available.
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