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Spring 2024
Bacteria employ various antimicrobial compounds to establish themselves within bacterial communities. Bacteriocins, which are ribosomally synthesized antimicrobial compounds, play a crucial role in this dynamic. This thesis focuses on strategies for purifying and identifying diverse bacteriocins...
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Examining the structure, function and mode of action of bacteriocins from lactic acid bacteria
DownloadSpring 2010
Carnocyclin A (CclA) is a remarkably stable, potent bacteriocin produced by Carnobacterium maltaromaticum UAL307. Elucidation of the amino acid and genetic sequences revealed that CclA is a circular bacteriocin. Preliminary structural studies (dynamic light scattering, NMR, circular dichroism,...
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Fall 2014
Paenibacillus polymyxa NRRL B-30509, Paenibacillus terrae NRRL B-30644 and P. polymyxa NRRL B-30507 were found to produce several bacteriocins and non-ribosomal peptides. All three strains produce tridecaptins, non-ribosomal lipopeptides antimicrobially active against food pathogen Campylobacter...
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Fall 2012
Thuricin CD, a two-component bacteriocin produced by Bacillus thuringiensis DPC 6431, exhibits potent activity against the hospital superbug Clostridium difficile ribotype O27. The two peptides (Trn-α and Trn-β) that constitute thuricin CD operate synergistically to kill sensitive bacteria at...
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Structural Studies of Peptides that Influence the Pathogenicity of Bacterial Infections, and Investigation of Structure-Activity-Relationships of Antimicrobial Peptides with Application to Cancer Therapy.
DownloadFall 2017
Enterocin 7 is a two-component, leaderless bacteriocin comprised of an A and B peptide and produced by Enterococcus faecalis 710C. The secondary structure of enterocin 7B was investigated through circular dichroism. A high degree of α-helicity was discovered by circular dichroism, regardless of...
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Spring 2018
Acidocin B (AcdB), a bacteriocin from Lactobacillus acidophilus M46 that was initially reported to be a linear peptide, was purified and shown to be circular based on MALDI-TOF MS and MS/MS sequencing. MS analysis further revealed that AcdB is comprised of 58 amino acid residues, instead of 59...