Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Dynamical and phase behavior of a phospholipid membrane altered by an antimicrobial peptide at low concentration

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [1];  [1];  [1];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Bhabha Atomic Research Centre, Mumbai (India)
Here we discuss that the mechanism of action of antimicrobial peptides is traditionally attributed to the formation of pores in the lipid cell membranes of pathogens, which requires a substantial peptide to lipid ratio. However, using incoherent neutron scattering, we show that even at a concentration too low for pore formation, an archetypal antimicrobial peptide, melittin, disrupts the regular phase behavior of the microscopic dynamics in a phospholipid membrane, dimyristoylphosphatidylcholine (DMPC). At the same time, another antimicrobial peptide, alamethicin, does not exert a similar effect on the DMPC microscopic dynamics. The melittin-altered lateral motion of DMPC at physiological temperature no longer resembles the fluid-phase behavior characteristic of functional membranes of the living cells. The disruptive effect demonstrated by melittin even at low concentrations reveals a new mechanism of antimicrobial action relevant in more realistic scenarios, when peptide concentration is not as high as would be required for pore formation, which may facilitate treatment with antimicrobial peptides.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1259423
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Vol. 7; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (53)

Melittin: a Membrane-active Peptide with Diverse Functions journal August 2007
A restatement of melittin-induced effects on the thermotropism of zwitterionic phospholipids journal August 1984
Morphological changes of phosphatidylcholine bilayers induced by melittin: vesicularization, fusion, discoidal particles journal July 1986
The actions of melittin on membranes journal May 1990
Differential scanning calorimetry and X-ray diffraction studies of the specificity of the interaction of antimicrobial peptides with membrane-mimetic systems journal December 1999
A Model for the Lipid Pretransition: Coupling of Ripple Formation with the Chain-Melting Transition journal March 2000
The Effect of Cholesterol on the Lateral Diffusion of Phospholipids in Oriented Bilayers journal May 2003
Method of oriented circular dichroism journal April 1990
Ultrasonic study of melittin effects on phospholipid model membranes journal December 1993
Cooperative effects in the interaction between melittin and phosphatidylcholine model membranes. Studies by temperature scanning densitometry. journal February 1983
Molecular mechanism of antimicrobial peptides: The origin of cooperativity journal September 2006
Detergent-like actions of linear amphipathic cationic antimicrobial peptides journal September 2006
Alzheimer's disease amyloid-β peptide analogue alters the ps-dynamics of phospholipid membranes journal October 2010
Peptide-induced bilayer thinning structure of unilamellar vesicles and the related binding behavior as revealed by X-ray scattering journal February 2013
Melittin-induced cholesterol reorganization in lipid bilayer membranes journal October 2015
Proline Facilitates Membrane Insertion of the Antimicrobial Peptide Maculatin 1.1 via Surface Indentation and Subsequent Lipid Disordering journal April 2013
Antimicrobial peptide alamethicin insertion into lipid bilayer: A QCM-D exploration journal April 2014
Role of lipids in the interaction of antimicrobial peptides with membranes journal April 2012
Structure and Dynamics of Ionic Micelles: MD Simulation and Neutron Scattering Study journal April 2015
Nanoscopic Dynamics of Phospholipid in Unilamellar Vesicles: Effect of Gel to Fluid Phase Transition journal March 2015
Effect of α-Tocopherol on the Microscopic Dynamics of Dimyristoylphosphatidylcholine Membrane journal December 2015
Antimicrobial Peptide Pores in Membranes Detected by Neutron In-Plane Scattering journal December 1995
Action of Antimicrobial Peptides:  Two-State Model journal July 2000
Lateral diffusion in the liquid phases of dimyristoylphosphatidylcholine/cholesterol lipid bilayers: a free volume analysis journal July 1992
Energetics of Pore Formation Induced by Membrane Active Peptides journal March 2004
Molecular Mechanism of Long-Range Diffusion in Phospholipid Membranes Studied by Quasielastic Neutron Scattering journal March 2010
Internal Dynamics in SDS Micelles: Neutron Scattering Study journal December 2010
Peptide-Induced Asymmetric Distribution of Charged Lipids in a Vesicle Bilayer Revealed by Small-Angle Neutron Scattering journal August 2011
Dynamical Features in Cationic Micelles of Varied Chain Length journal July 2012
Dynamics in Anionic Micelles: Effect of Phenyl Ring journal May 2013
Alamethicin Disrupts the Cholesterol Distribution in Dimyristoyl Phosphatidylcholine–Cholesterol Lipid Bilayers journal September 2014
Antimicrobial peptides of multicellular organisms journal January 2002
Membranes are more mosaic than fluid journal November 2005
Antimicrobial peptides: pore formers or metabolic inhibitors in bacteria? journal March 2005
Can innate immunity be enhanced to treat microbial infections? journal June 2004
Effect of antimicrobial peptide on the dynamics of phosphocholine membrane: role of cholesterol and physical state of bilayer journal January 2015
Diffusion in single supported lipid bilayers studied by quasi-elastic neutron scattering journal January 2010
Conformational and segmental dynamics in lipid-based vesicles journal January 2011
Short range ballistic motion in fluid lipid bilayers studied by quasi-elastic neutron scattering journal January 2011
The picosecond dynamics of the phospholipid dimyristoylphosphatidylcholine in mono- and bilayers journal January 2012
The dynamical landscape in CTAB micelles journal January 2012
Partitioning of ethanol into lipid membranes and its effect on fluidity and permeability as seen by X-ray and neutron scattering journal January 2012
High hydrostatic pressure effects investigated by neutron scattering on lipid multilamellar vesicles journal January 2013
The high-flux backscattering spectrometer at the NIST Center for Neutron Research journal May 2003
Self-diffusion in molecular liquids: Medium-chain n-alkanes and coenzyme Q10 studied by quasielastic neutron scattering journal July 2008
A time-of-flight backscattering spectrometer at the Spallation Neutron Source, BASIS journal August 2011
Process of inducing pores in membranes by melittin journal August 2013
The Bio-SANS instrument at the High Flux Isotope Reactor of Oak Ridge National Laboratory journal June 2014
Alamethicin: A Peptide Model for Voltage Gating and Protein-Membrane Interactions journal June 1994
NMR Studies of Lipid Lateral Diffusion in the DMPC/Gramicidin D/Water System: Peptide Aggregation and Obstruction Effects journal August 2004
Morphological Behavior of Lipid Bilayers Induced by Melittin near the Phase Transition Temperature journal November 2005
Structure of the Alamethicin Pore Reconstructed by X-Ray Diffraction Analysis journal May 2008
DAVE: A Comprehensive Software Suite for the Reduction, Visualization, and Analysis of Low Energy Neutron Spectroscopic Data
  • Azuah, Richard Tumanjong; Kneller, Larry R.; Qiu, Yiming
  • Journal of Research of the National Institute of Standards and Technology, Vol. 114, Issue 6 https://doi.org/10.6028/jres.114.025
journal November 2009

Cited By (5)

Effect of Bifunctional β Defensin 2-Modified Scaffold on Bone Defect Reconstruction journal February 2020
Dynamical Transitions and Diffusion Mechanism in DODAB Bilayer journal January 2018
Deciphering interactions of ionic liquids with biomembrane journal March 2018
Relaxation dynamics of saturated and unsaturated oriented lipid bilayers journal January 2018
Membrane softening by nonsteroidal anti-inflammatory drugs investigated by neutron spin echo journal January 2019