Oligotryptophan-tagged antimicrobial peptides and the role of the cationic sequence
(2009) In Biochimica et Biophysica Acta - Biomembranes 1788(9). p.1916-1923- Abstract
- The effects of varying the cationic sequence of oligotryptophan-tagged antimicrobial peptides were investigated in terms of peptide adsorption to model lipid membranes, liposome leakage induction, and antibacterial potency. Heptamers of lysine (K7) and arginine (R7) were lytic against Escherichia coli bacteria at low ionic strength. In parallel, both peptides adsorbed on to bilayers formed by E. coli phospholipids, and caused leakage in the corresponding liposomes. K7 was the more potent of the two peptides in causing liposome leakage, although the adsorption of this peptide on E coli membranes was lower than that of R7. The bactericidal effect, liposome lysis, and membrane adsorption were all substantially reduced at physiological ionic... (More)
- The effects of varying the cationic sequence of oligotryptophan-tagged antimicrobial peptides were investigated in terms of peptide adsorption to model lipid membranes, liposome leakage induction, and antibacterial potency. Heptamers of lysine (K7) and arginine (R7) were lytic against Escherichia coli bacteria at low ionic strength. In parallel, both peptides adsorbed on to bilayers formed by E. coli phospholipids, and caused leakage in the corresponding liposomes. K7 was the more potent of the two peptides in causing liposome leakage, although the adsorption of this peptide on E coli membranes was lower than that of R7. The bactericidal effect, liposome lysis, and membrane adsorption were all substantially reduced at physiological ionic strength. When a tryptophan pentamer tag was linked to the C-terminal end of these peptides, substantial peptide adsorption, membrane lysis, and bacterial killing were observed also at high ionic strength, and also for a peptide of lower cationic charge density (KNKGKKN-W5). Strikingly, the order of membrane lytic potential of the cationic peptides investigated was reversed when tagged. This and other aspects of peptide behavior and adsorption, in conjunction with effects on liposomes and bacteria, suggest that tagged and untagged peptides act by different lytic mechanisms, which to some extent counterbalance each other. Thus, while the untagged peptides act by generating negative curvature strain in the phospholipid membrane, the tagged peptides cause positive curvature strain. The tagged heptamer of arginine, R7W5, was the best candidate for E coli membrane lysis at physiological salt conditions and proved to be an efficient antibacterial agent. (C) 2009 Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1490783
- author
- Stromstedt, Adam A. ; Pasupuleti, Mukesh LU ; Schmidtchen, Artur LU and Malmsten, Martin LU
- organization
- publishing date
- 2009
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Oligoarginine, Oligolysine, Oligotryptophan, Ellipsometry, Bacteria, Liposome, Membrane, Bilayer, Phospholipid, End-tagged, Peptide, AMP, Antimicrobial
- in
- Biochimica et Biophysica Acta - Biomembranes
- volume
- 1788
- issue
- 9
- pages
- 1916 - 1923
- publisher
- Elsevier
- external identifiers
-
- wos:000269859400025
- scopus:68749107070
- pmid:19505433
- ISSN
- 0005-2736
- DOI
- 10.1016/j.bbamem.2009.06.001
- language
- English
- LU publication?
- yes
- id
- 3975c518-2544-4ca7-855c-40ac1ab65da2 (old id 1490783)
- date added to LUP
- 2016-04-01 15:04:50
- date last changed
- 2022-01-28 04:26:32
@article{3975c518-2544-4ca7-855c-40ac1ab65da2,
abstract = {{The effects of varying the cationic sequence of oligotryptophan-tagged antimicrobial peptides were investigated in terms of peptide adsorption to model lipid membranes, liposome leakage induction, and antibacterial potency. Heptamers of lysine (K7) and arginine (R7) were lytic against Escherichia coli bacteria at low ionic strength. In parallel, both peptides adsorbed on to bilayers formed by E. coli phospholipids, and caused leakage in the corresponding liposomes. K7 was the more potent of the two peptides in causing liposome leakage, although the adsorption of this peptide on E coli membranes was lower than that of R7. The bactericidal effect, liposome lysis, and membrane adsorption were all substantially reduced at physiological ionic strength. When a tryptophan pentamer tag was linked to the C-terminal end of these peptides, substantial peptide adsorption, membrane lysis, and bacterial killing were observed also at high ionic strength, and also for a peptide of lower cationic charge density (KNKGKKN-W5). Strikingly, the order of membrane lytic potential of the cationic peptides investigated was reversed when tagged. This and other aspects of peptide behavior and adsorption, in conjunction with effects on liposomes and bacteria, suggest that tagged and untagged peptides act by different lytic mechanisms, which to some extent counterbalance each other. Thus, while the untagged peptides act by generating negative curvature strain in the phospholipid membrane, the tagged peptides cause positive curvature strain. The tagged heptamer of arginine, R7W5, was the best candidate for E coli membrane lysis at physiological salt conditions and proved to be an efficient antibacterial agent. (C) 2009 Elsevier B.V. All rights reserved.}},
author = {{Stromstedt, Adam A. and Pasupuleti, Mukesh and Schmidtchen, Artur and Malmsten, Martin}},
issn = {{0005-2736}},
keywords = {{Oligoarginine; Oligolysine; Oligotryptophan; Ellipsometry; Bacteria; Liposome; Membrane; Bilayer; Phospholipid; End-tagged; Peptide; AMP; Antimicrobial}},
language = {{eng}},
number = {{9}},
pages = {{1916--1923}},
publisher = {{Elsevier}},
series = {{Biochimica et Biophysica Acta - Biomembranes}},
title = {{Oligotryptophan-tagged antimicrobial peptides and the role of the cationic sequence}},
url = {{http://dx.doi.org/10.1016/j.bbamem.2009.06.001}},
doi = {{10.1016/j.bbamem.2009.06.001}},
volume = {{1788}},
year = {{2009}},
}