In-cell DNP NMR reveals multiple targeting effect of antimicrobial peptide #DNPNMR

Published: Wednesday, 26 April 2023 - 10:00 -0400

Author: Thorsten Maly

Separovic, Frances, Vinzenz Hofferek, Anthony P. Duff, Malcom J. McConville, and Marc-Antoine Sani. “In-Cell DNP NMR Reveals Multiple Targeting Effect of Antimicrobial Peptide.” Journal of Structural Biology: X 6 (January 1, 2022): 100074.

Dynamic nuclear polarization NMR spectroscopy was used to investigate the effect of the antimicrobial peptide (AMP) maculatin 1.1 on E. coli cells. The enhanced 15N NMR signals from nucleic acids, proteins and lipids identified a number of unanticipated physiological responses to peptide stress, revealing that membrane-active AMPs can have a multi-target impact on E. coli cells. DNP-enhanced 15N-observed 31P-dephased REDOR NMR allowed monitoring how Mac1 induced DNA condensation and prevented intermolecular salt bridges between the main E. coli lipid phosphatidylethanolamine (PE) molecules. The latter was supported by similar results obtained using E. coli PE lipid systems. Overall, the ability to monitor the action of antimicrobial peptides in situ will provide greater insight into their mode of action.