10-16 June 2018
Dalhousie University
America/Halifax timezone
Welcome to the 2018 CAP Congress Program website! / Bienvenue au siteweb du programme du Congrès de l'ACP 2018!

2H NMR Studies of Bacterial Membranes Disruption Resulting from the Interaction with Antimicrobial Peptides (G)*

12 Jun 2018, 16:00
SUB 224 (cap.50) (Dalhousie University)

SUB 224 (cap.50)

Dalhousie University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Physics in Medicine and Biology / Physique en médecine et en biologie (DPMB-DPMB) T4-7 Physics of Biosensing (DPMB) | Physique de la biodétection (DPMB)


Nury P. Santisteban (Memorial University of Newfoundland)


Antimicrobial Peptides (AMPs) are small chains of between 10 and 50 amino acids with the ability to kill pathogens such as bacteria, fungus, viruses, and even cancer cells. AMPs are one of many mechanisms that living organism have developed to protect themselves from pathogenic microorganisms. Most research in AMPs is focused on understanding the mechanism or mechanisms that AMPs use to kill pathogens. In the case of bacteria, it is widely accepted that AMPs are able to disrupt the bacterial cell membrane more specifically, the lipid bilayer. In order to fully understand how AMPs are able to kill bacteria, it is also important to understand the role of other components of the bacterial cell envelope such as the lipopolysaccharides and the peptidoglycan (PGN) layer. 2H NMR is a technique that can be used to study the fluidity of lipid bilayers assemblies. In particular, 2H NMR can be used to identify order parameter changes resulting from the interaction between lipid vesicles with AMPs. Our group and others have developed methods to grow 2H-membrane-enriched bacteria. In this research, We observe the changes in the 2H NMR spectrum of different bacterial strains (E .coli LA8, E. coli JM109 and B. subtillis) in the presence and absence of different AMPs (MSI-78, CAME and BP100). Additionally, exploring the importance of the PNG layer in the interaction between the MSI-78 and BP100 with the lipids in the bacterial cell membrane of B. subtillis, we discovered that the removal of the PGN layer does not generate changes in the 2H NMR spectrum of B. subtillis. Moreover, the level of disruption observed on the lipid bilayer of B. subtillis caused by MSI-78 and BP100 does not change after the partial removal of the PGN layer.

Funded by grants to VB and MRM from the Natural Sciences and Engineering Research Council of Canada and a grant to NPS from the alliance Colciencias-Colfuturo.

Primary authors

Nury P. Santisteban (Memorial University of Newfoundland) Prof. Michael Morrow (Memorial University of Newfoundland) Dr Valerie Booth (Memorial University of Newfoundland)

Presentation Materials