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Effect of Chirality and Amphiphilicity on the Antimicrobial Activity of Tripodal Lysine-Based Peptides.
ACS Appl Bio Mater
January 2025
School of Chemistry, Pharmacy and Food Biosciences, University of Reading, Whiteknights, Reading RG6 6AD, U.K.
A series of tripodal (three-arm) lysine-based peptides were designed and synthesized and their self-assembly properties in aqueous solution and antimicrobial activity were investigated. We compare the behaviors of homochiral tripodal peptides (KKY)K and a homologue containing the bulky aromatic fluorenylmethoxycarbonyl (Fmoc) group Fmoc-(KKY)K, and heterochiral analogues containing k (d-Lys), (kkY)K and Fmoc-(kkY)K. The molecular conformation and self-assembly in aqueous solutions were probed using various spectroscopic techniques, along with small-angle X-ray scattering (SAXS) and cryogenic-transmission electron microscopy (cryo-TEM).
View Article and Find Full Text PDFStructural and functional analysis of the lipoprotein chaperone LolA.
Front Microbiol
December 2024
Umeå Centre for Microbial Research (UCMR), Umeå University, Umeå, Sweden.
Lipoproteins are crucial for maintaining the structural integrity of bacterial membranes. In Gram-negative bacteria, the localization of lipoprotein (Lol) system facilitates the transport of these proteins from the inner membrane to the outer membrane. In , an ε-proteobacterium, lipoprotein transport differs significantly from the canonical and well-studied system in , particularly due to the absence of LolB and the use of a LolF homodimer instead of the LolCE heterodimer.
View Article and Find Full Text PDFAntimicrobial activity and synergistic effect of phage-encoded antimicrobial peptides with colistin and outer membrane permeabilizing agents against .
PeerJ
December 2024
Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Muang, Phitsanulok, Thailand.
Background: poses a significant public health threat. Phage-encoded antimicrobial peptides (AMPs) have emerged as promising candidates in the battle against antibiotic-resistant .
Methods: Antimicrobial peptides from the endolysin of bacteriophage were designed from bacteriophage vB_AbaM_PhT2 and vB_AbaAut_ChT04.
A multi-valent polymyxin-based fluorescent probe for the detection of Gram-negative infections.
J Mater Chem B
December 2024
Precision Healthcare University Research Institute, Queen Mary University of London, Empire House, London, E1 1HH, UK.
A multi-branched fluorogenic probe for the rapid and specific detection of Gram-negative bacteria is reported. Three Gram-negative-targeting azido-modified polymyxins were clicked onto a trivalent scaffold functionalised with the environmental green-emitting fluorophore 7-nitrobenz-2-oxa-1,3-diazole. The probe allowed wash-free detection of target bacteria with increased sensitivity and lower limits of detection compared to monovalent probes.
View Article and Find Full Text PDFAntimicrobial and Anti-Inflammatory Activity of Bauhinia Pulchella Extract Fractions.
Chem Biodivers
December 2024
Department of Pharmaceutical Sciences, Federal University of Pernambuco, Cidade Universitária, Recife, Pernambuco, Brazil.
This study investigates the antimicrobial and anti-inflammatory activities of fractions from the stem extract of Bauhinia pulchella Benth. The ethanolic extract was fractionated using column adsorption chromatography, resulting in a hexane fraction (J1) and a dichloromethane fraction (J2), both rich in terpenes and steroids. Characterization was performed using gas chromatography coupled with mass spectrometry (GC-MS).
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