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Title: Elucidating Duramycin’s Bacterial Selectivity and Mode of Action on the Bacterial Cell Envelope

Abstract

The use of naturally occurring antimicrobial peptides provides a promising route to selectively target pathogenic agents and to shape microbiome structure. Lantibiotics, such as duramycin, are one class of bacterially produced peptidic natural products that can selectively inhibit the growth of other bacteria. However, despite longstanding characterization efforts, the microbial selectivity and mode of action of duramycin are still obscure. We describe here a suite of biological, chemical, and physical characterizations that shed new light on the selective and mechanistic aspects of duramycin activity. Bacterial screening assays have been performed using duramycin and Populus-derived bacterial isolates to determine species selectivity. Lipidomic profiles of selected resistant and sensitive strains show that the sensitivity of Gram-positive bacteria depends on the presence of phosphatidylethanolamine (PE) in the cell membrane. Further the surface and interface morphology were studied by high resolution atomic force microscopy and showed a progression of cellular changes in the cell envelope after treatment with duramycin for the susceptible bacterial strains. Together, these molecular and cellular level analyses provide insight into duramycin’s mode of action and a better understanding of its selectivity.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1433018
Alternate Identifier(s):
OSTI ID: 1423045
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Frontiers in Microbiology
Additional Journal Information:
Journal Name: Frontiers in Microbiology Journal Volume: 9; Journal ID: ISSN 1664-302X
Publisher:
Frontiers Media SA
Country of Publication:
Switzerland
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; duramycin; lipid; phosphatidylethanolamine (PE); peptidoglycan; atomic force microscopy (AFM); lipidomics; cell elasticity; molecular adhesion force

Citation Formats

Hasim, Sahar, Allison, David P., Mendez, Berlin, Farmer, Abigail T., Pelletier, Dale A., Retterer, Scott T., Campagna, Shawn R., Reynolds, Todd B., and Doktycz, Mitchel J. Elucidating Duramycin’s Bacterial Selectivity and Mode of Action on the Bacterial Cell Envelope. Switzerland: N. p., 2018. Web. doi:10.3389/fmicb.2018.00219.
Hasim, Sahar, Allison, David P., Mendez, Berlin, Farmer, Abigail T., Pelletier, Dale A., Retterer, Scott T., Campagna, Shawn R., Reynolds, Todd B., & Doktycz, Mitchel J. Elucidating Duramycin’s Bacterial Selectivity and Mode of Action on the Bacterial Cell Envelope. Switzerland. doi:10.3389/fmicb.2018.00219.
Hasim, Sahar, Allison, David P., Mendez, Berlin, Farmer, Abigail T., Pelletier, Dale A., Retterer, Scott T., Campagna, Shawn R., Reynolds, Todd B., and Doktycz, Mitchel J. Wed . "Elucidating Duramycin’s Bacterial Selectivity and Mode of Action on the Bacterial Cell Envelope". Switzerland. doi:10.3389/fmicb.2018.00219.
@article{osti_1433018,
title = {Elucidating Duramycin’s Bacterial Selectivity and Mode of Action on the Bacterial Cell Envelope},
author = {Hasim, Sahar and Allison, David P. and Mendez, Berlin and Farmer, Abigail T. and Pelletier, Dale A. and Retterer, Scott T. and Campagna, Shawn R. and Reynolds, Todd B. and Doktycz, Mitchel J.},
abstractNote = {The use of naturally occurring antimicrobial peptides provides a promising route to selectively target pathogenic agents and to shape microbiome structure. Lantibiotics, such as duramycin, are one class of bacterially produced peptidic natural products that can selectively inhibit the growth of other bacteria. However, despite longstanding characterization efforts, the microbial selectivity and mode of action of duramycin are still obscure. We describe here a suite of biological, chemical, and physical characterizations that shed new light on the selective and mechanistic aspects of duramycin activity. Bacterial screening assays have been performed using duramycin and Populus-derived bacterial isolates to determine species selectivity. Lipidomic profiles of selected resistant and sensitive strains show that the sensitivity of Gram-positive bacteria depends on the presence of phosphatidylethanolamine (PE) in the cell membrane. Further the surface and interface morphology were studied by high resolution atomic force microscopy and showed a progression of cellular changes in the cell envelope after treatment with duramycin for the susceptible bacterial strains. Together, these molecular and cellular level analyses provide insight into duramycin’s mode of action and a better understanding of its selectivity.},
doi = {10.3389/fmicb.2018.00219},
journal = {Frontiers in Microbiology},
number = ,
volume = 9,
place = {Switzerland},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.3389/fmicb.2018.00219

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Cited by: 1 work
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