Synergistic Effect of Propidium Iodide and Small Molecule Antibiotics with the Antimicrobial Peptide Dendrimer G3KL against Gram-Negative Bacteria

Gan, Bee-Ha; Cai, Xingguang; Javor, Sacha; Köhler, Thilo; Reymond, Jean-Louis (2020). Synergistic Effect of Propidium Iodide and Small Molecule Antibiotics with the Antimicrobial Peptide Dendrimer G3KL against Gram-Negative Bacteria. Molecules, 25(23), p. 5643. Molecular Diversity Preservation International MDPI 10.3390/molecules25235643

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There is an urgent need to develop new antibiotics against multidrug-resistant bacteria. Many antimicrobial peptides (AMPs) are active against such bacteria and often act by destabilizing membranes, a mechanism that can also be used to permeabilize bacteria to other antibiotics, resulting in synergistic effects. We recently showed that G3KL, an AMP with a multibranched dendritic topology of the peptide chain, permeabilizes the inner and outer membranes of Gram-negative bacteria including multidrug-resistant strains, leading to efficient bacterial killing. Here, we show that permeabilization of the outer and inner membranes of Pseudomonas aeruginosa by G3KL, initially detected using the DNA-binding fluorogenic dye propidium iodide (PI), also leads to a synergistic effect between G3KL and PI in this bacterium. We also identify a synergistic effect between G3KL and six different antibiotics against the Gram-negative Klebsiella pneumoniae, against which G3KL is inactive.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Gan, Bee Ha; Cai, Xingguang; Javor, Sacha and Reymond, Jean-Louis

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

1420-3049

Publisher:

Molecular Diversity Preservation International MDPI

Language:

English

Submitter:

Sandra Tanja Zbinden Di Biase

Date Deposited:

19 Jan 2021 08:22

Last Modified:

24 Jan 2021 02:58

Publisher DOI:

10.3390/molecules25235643

BORIS DOI:

10.48350/148890

URI:

https://boris.unibe.ch/id/eprint/148890

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