skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Peptide-Induced Lipid Flip-Flop in Asymmetric Liposomes Measured by Small Angle Neutron Scattering

Journal Article · · Langmuir
 [1];  [1];  [1];  [2]; ORCiD logo [3];  [4];  [4];  [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [1]
  1. Univ. of Windsor, Windsor, ON (Canada)
  2. Univ. of Texas Health Science Center at Houston, Houston, TX (United States)
  3. Univ. of Texas Health Science Center at Houston, Houston, TX (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Despite the prevalence of lipid transbilayer asymmetry in natural plasma membranes, most biomimetic model membranes studied are symmetric. Recent advances have helped to overcome the difficulties in preparing asymmetric liposomes in vitro, allowing for the examination of a larger set of relevant biophysical questions. Here, we investigate the stability of asymmetric bilayers by measuring lipid flip-flop with time-resolved small-angle neutron scattering (SANS). Asymmetric large unilamellar vesicles with inner bilayer leaflets containing predominantly 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) and outer leaflets composed mainly of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) displayed slow spontaneous flip-flop at 37 °C (half-time, t1/2 = 140 h). However, inclusion of peptides, namely, gramicidin, alamethicin, melittin, or pHLIP (i.e., pH-low insertion peptide), accelerated lipid flip-flop. For three of these peptides (i.e., pHLIP, alamethicin, and melittin), each of which was added externally to preformed asymmetric vesicles, we observed a completely scrambled bilayer in less than 2 h. Gramicidin, on the other hand, was preincorporated during the formation of the asymmetric liposomes and showed a time resolvable 8-fold increase in the rate of lipid asymmetry loss. These results point to a membrane surface-related (e.g., adsorption/insertion) event as the primary driver of lipid scrambling in the asymmetric model membranes of this study. Here, we discuss the implications of membrane peptide binding, conformation, and insertion on lipid asymmetry.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1561589
Journal Information:
Langmuir, Vol. 35, Issue 36; ISSN 0743-7463
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

References (56)

Identification of a functional role for lipid asymmetry in biological membranes: Phosphatidylserine-skeletal protein interactions modulate membrane stability journal February 2002
Platelet membrane phospholipid asymmetry: from the characterization of a scramblase activity to the identification of an essential protein mutated in Scott syndrome: Platelet phospholipid scramblase journal September 2011
ATP-dependent asymmetric distribution of spin-labeled phospholipids in the erythrocyte membrane: relation to shape changes. journal June 1984
Early redistribution of plasma membrane phosphatidylserine is a general feature of apoptosis regardless of the initiating stimulus: inhibition by overexpression of Bcl-2 and Abl journal November 1995
Membrane and lipid involvement in blood coagulation journal July 1978
Cell-sized asymmetric lipid vesicles facilitate the investigation of asymmetric membranes journal June 2016
Oriented Reconstitution of a Membrane Protein in a Giant Unilamellar Vesicle: Experimental Verification with the Potassium Channel KcsA journal August 2011
Asymmetric Lipid Membranes: Towards More Realistic Model Systems journal May 2015
Phosphatidylserine Asymmetry Promotes the Membrane Insertion of a Transmembrane Helix journal April 2019
Gramicidin Increases Lipid Flip-Flop in Symmetric and Asymmetric Lipid Vesicles journal March 2019
Effect of natural amphipathic peptides on viability, membrane potential, cell shape and motility of mollicutes journal February 1997
Pore-Forming Peptides Induce Rapid Phospholipid Flip-Flop in Membranes journal May 1994
Electrophysiological interrogation of asymmetric droplet interface bilayers reveals surface-bound alamethicin induces lipid flip-flop journal January 2019
Facile Lipid Flip-Flop in a Phospholipid Bilayer Induced by Gramicidin A Measured by Sum-Frequency Vibrational Spectroscopy journal January 2007
Molecular Simulations of Lipid Flip-Flop in the Presence of Model Transmembrane Helices journal September 2010
Transbilayer Transport of Ions and Lipids Coupled with Mastoparan X Translocation journal January 1996
Induction of yeast apoptosis by an antimicrobial peptide, Papiliocin journal April 2011
Transbilayer Movement of Phospholipids at the Main Phase Transition of Lipid Membranes: Implications for Rapid Flip-Flop in Biological Membranes journal December 2002
Inside-outside transitions of phospholipids in vesicle membranes journal March 1971
Phospholipid Flop Induced by Transmembrane Peptides in Model Membranes Is Modulated by Lipid Composition journal January 2003
Investigation on lipid asymmetry using lipid probes journal June 2002
1,2-Diacyl-Phosphatidylcholine Flip-Flop Measured Directly by Sum-Frequency Vibrational Spectroscopy journal October 2005
Free Energy and Entropy of Activation for Phospholipid Flip-Flop in Planar Supported Lipid Bilayers journal February 2010
Lipid Exchange and Flip-Flop in Solid Supported Bilayers journal October 2013
1 H NMR Shows Slow Phospholipid Flip-Flop in Gel and Fluid Bilayers journal February 2017
The in vivo structure of biological membranes and evidence for lipid domains journal May 2017
Potentials of Small-angle Neutron Scattering for Studies of the Structure of “Live” Mitochondria journal July 2011
Fluid phase lipid areas and bilayer thicknesses of commonly used phosphatidylcholines as a function of temperature journal November 2011
Subnanometer Structure of an Asymmetric Model Membrane: Interleaflet Coupling Influences Domain Properties journal May 2016
Joint small-angle X-ray and neutron scattering data analysis of asymmetric lipid vesicles journal February 2017
Determination of Interbilayer and Transbilayer Lipid Transfers by Time-Resolved Small-Angle Neutron Scattering journal June 2007
Flip-Flop of Phospholipids in Vesicles: Kinetic Analysis with Time-Resolved Small-Angle Neutron Scattering journal May 2009
Noninvasive Neutron Scattering Measurements Reveal Slower Cholesterol Transport in Model Lipid Membranes journal July 2011
Biophysical Parameters of the Sec14 Phospholipid Exchange Cycle journal January 2019
Reconciling Differences between Lipid Transfer in Free-Standing and Solid Supported Membranes: A Time-Resolved Small-Angle Neutron Scattering Study journal March 2017
Preparation of asymmetric phospholipid vesicles for use as cell membrane models journal September 2018
Preparation and Properties of Asymmetric Synthetic Membranes Based on Lipid and Polymer Self-Assembly journal February 2018
Structure and Functions of Channel-Forming Peptides: Magainins, Cecropins, Melittin and Alamethicin journal April 1997
Determination of the Membrane Translocation pK of the pH-Low Insertion Peptide journal August 2017
A Monomeric Membrane Peptide that Lives in Three Worlds: In Solution, Attached to, and Inserted across Lipid Bilayers journal October 2007
Tuning the insertion properties of pHLIP journal June 2010
Intrinsic Curvature-Mediated Transbilayer Coupling in Asymmetric Lipid Vesicles journal January 2018
Mantid—Data analysis and visualization package for neutron scattering and μ SR experiments
  • Arnold, O.; Bilheux, J. C.; Borreguero, J. M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 764 https://doi.org/10.1016/j.nima.2014.07.029
journal November 2014
Small-Angle Scattering from Homogenous and Heterogeneous Lipid Bilayers book January 2010
Peptide-Induced Asymmetric Distribution of Charged Lipids in a Vesicle Bilayer Revealed by Small-Angle Neutron Scattering journal August 2011
Novel radioactive phospholipid probes as a tool for measurement of phospholipid translocation across biomembranes journal September 1993
The Negative Charge of the Membrane Has Opposite Effects on the Membrane Entry and Exit of pH-Low Insertion Peptide journal February 2015
Methanol Accelerates DMPC Flip-Flop and Transfer: A SANS Study on Lipid Dynamics journal March 2019
Protein–lipid interactions and non-lamellar lipidic structures in membrane pore formation and membrane fusion journal March 2016
β-Sheet Pore-Forming Peptides Selected from a Rational Combinatorial Library:  Mechanism of Pore Formation in Lipid Vesicles and Activity in Biological Membranes journal October 2007
Mode of action of membrane active antimicrobial peptides journal January 2002
Describing the Mechanism of Antimicrobial Peptide Action with the Interfacial Activity Model journal August 2010
Bilayer Interactions of pHLIP, a Peptide that Can Deliver Drugs and Target Tumors journal July 2008
Molecular mechanism of antimicrobial peptides: The origin of cooperativity journal September 2006
Effect of the phase transition on the transbilayer movement of dimyristoyl phosphatidylcholine in unilamellar vesicles journal July 1978
Energetics of peptide (pHLIP) binding to and folding across a lipid bilayer membrane journal October 2008

Figures / Tables (3)


Similar Records

Gramicidin Increases Lipid Flip-Flop in Symmetric and Asymmetric Lipid Vesicles
Journal Article · Fri Mar 01 00:00:00 EST 2019 · Biophysical Journal · OSTI ID:1561589

Methanol Accelerates DMPC Flip-Flop and Transfer: A SANS Study on Lipid Dynamics
Journal Article · Fri Mar 01 00:00:00 EST 2019 · Biophysical Journal · OSTI ID:1561589

1 H NMR Shows Slow Phospholipid Flip-Flop in Gel and Fluid Bilayers
Journal Article · Fri Feb 03 00:00:00 EST 2017 · Langmuir · OSTI ID:1561589