Reconstitution of hepatic uricase in planar lipid bilayer reveals a functional organic anion channel

1995 ◽  
Vol 146 (2) ◽  
Author(s):  
E. Leal-Pinto ◽  
R.D. London ◽  
B.A. Knorr ◽  
R.G. Abramson
Keyword(s):  
Lipid Bilayer ◽  
Organic Anion ◽  
Anion Channel ◽  
Planar Lipid Bilayer

scholarly journals Single channel planar lipid bilayer recordings of the melittin variant MelP5

2017 ◽  
Vol 1859 (10) ◽  
pp. 2051-2057 ◽  
Author(s):  
Aziz Fennouri ◽  
Simon Finn Mayer ◽  
Thomas B.H. Schroeder ◽  
Michael Mayer
Keyword(s):  
Lipid Bilayer ◽  
Single Channel ◽  
Planar Lipid Bilayer

Formation of asymmetrical planar lipid bilayer membranes from characterized monolayers

1983 ◽  
Vol 7 (4) ◽  
pp. 299-310 ◽  
Author(s):  
Pierre Tancrède ◽  
Paul Paquin ◽  
André Houle ◽  
Roger M. Leblanc
Keyword(s):  
Lipid Bilayer ◽  
Planar Lipid Bilayer ◽  
Lipid Bilayer Membranes ◽  
Bilayer Membranes

scholarly journals Surface roughness as rupture control factor of lipid vesicles

2013 ◽  
Vol 19 (S4) ◽  
pp. 107-108 ◽  
Author(s):  
A.A. Duarte ◽  
M. Raposo
Keyword(s):  
Lipid Bilayer ◽  
Lipid Bilayers ◽  
Biological Membrane ◽  
Substrate Surface ◽  
Lipid Vesicles ◽  
Planar Lipid Bilayer ◽  
Root Mean Square Roughness ◽  
Control Factor ◽  
Formation Mechanisms ◽  
Adsorbed Amount

Liposomes or lipid vesicles are self-closed structures formed by one or several concentric lipid bilayers with an aqueous phase inside, which may incorporate almost any molecule, namely proteins, hormones, enzymes, antibiotics, anticancer agents, antifungical agents, gene transfer agents, DNA, and whole viruses. Scientific evidences prove that unprotected liposomes containing drugs are easily released from the endoplasmic reticulum of the cell. To increase the vesicles lifetime and to activate a controlled drug release with an external stimulus, the vesicles immobilization on a surface and the factors which create conditions to the liposome rupture have to be analyzed. A number of studies have identified some of the critical stages of vesicle adsorption (adhesion), fusion, deformation, rupture, and spreading of the lipid bilayer. Nevertheless, the formation mechanisms of well-controlled continuous supported bilayers or adsorption of whole liposomes are still not fully understood. As yet it was demonstrated that a controlled adsorption of vesicles containing a small fraction of charged lipids occurs without rupture and their subsequent embedding in polyelectrolyte multilayer (PEM) films, meaning vesicles may be immobilized in an intact or slightly deformed state, which can act as drug reservoirs. Moreover, depending on the nature of the physicochemical conditions of the vesicle solution and the substrate surface, a flat lipid bilayer can be formed, known as supported lipid bilayers, which can incorporate membrane proteins and keep the native dynamics of the lipid bilayer mimicking a biological membrane. In this study, a layer of 1,2-dipalmitoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] (sodium salt) (DPPG) liposomes adsorbed onto PEMs cushions based on poly(ethylenimine) (PEI), poly(sodium 4-styrenesulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) polyelectrolytes was analyzed by atomic force microscopy (AFM) technique in non-contact mode and quartz crystal microbalance (QCM).Sequential heterostructures of Si/PEI(PSS/PAH)4 and Si/PAH, also designated cushions, were prepared onto silicon substrates using the layer-by-layer (LbL) technique with polyelectrolyte solutions of PEI, PSS and PAH of monomeric concentrations of 0.01M. Topographic images of 1×1μm2 area of Si/PAH/DPPG (Figure 1 a), and Si/PEI(PSS/PAH)4/DPPG (Figure 1 b) LbL films were acquired by AFM. The root mean square roughness (RMS) calculated from topographies data are listed in table I. As shown, when a DPPG layer is adsorbed onto Si/PAH the RMS keeps an approximately equal value meaning that the liposome disrupted and spread onto the surface forming a planar lipid bilayer. But when a DPPG layer is adsorbed onto Si/PEI(PSS/PAH)4 the RMS value doubled, indicating that the structural integrity of the liposomes is maintained, even though there has been any deformation during adsorption. The adsorbed amount of the two PEMs and DPPG-liposomes layers was measured using a QCM and is displayed in table I. The DPPG adsorbed amount obtained on the PAH cushion was approximately equal to a planar lipid bilayer, while the adsorption onto PEI(PSS/PAH)4 was higher than the predicted for a planar lipid bilayer. This behavior suggests that the DPPG liposomes on the second PEM remained intact during adsorption. Both confirm the AFM results. Therefore we conclude that the initial roughness of the surface is a primordial factor to determine the adsorption or not of intact vesicles.The authors acknowledge the “Fundação para a Ciência e Tecnologia” (FCT-MEC) by the post-graduate scholarship SFRH/BD/62229/2009 and the “Plurianual” funding.

scholarly journals Reconstitution of bacterial outer membrane TonB-dependent transporters in planar lipid bilayer membranes

2009 ◽  
Vol 106 (51) ◽  
pp. 21990-21995 ◽  
Author(s):  
E. Udho ◽  
K. S. Jakes ◽  
S. K. Buchanan ◽  
K. J. James ◽  
X. Jiang ◽  
...  
Keyword(s):  
Outer Membrane ◽  
Lipid Bilayer ◽  
Planar Lipid Bilayer ◽  
Lipid Bilayer Membranes ◽  
Bilayer Membranes ◽  
Bacterial Outer Membrane

Single sodium channels from rat brain incorporated into planar lipid bilayer membranes

Nature ◽  
1983 ◽  
Vol 303 (5913) ◽  
pp. 172-175 ◽  
Author(s):  
Bruce K. Krueger ◽  
Jennings F. Worley ◽  
Robert J. French
Keyword(s):  
Rat Brain ◽  
Lipid Bilayer ◽  
Sodium Channels ◽  
Planar Lipid Bilayer ◽  
Lipid Bilayer Membranes ◽  
Bilayer Membranes ◽  
Single Sodium Channels

Electrophysiological properties of channel formed by bovine FOF1 ATP synthase in planar lipid bilayer

2018 ◽  
Vol 1859 ◽  
pp. e84
Author(s):  
Andrea Urbani ◽  
Valentina Giorgio ◽  
Chimari Jiko ◽  
Janna F.M. Bogers ◽  
Duncan G.G. McMillan ◽  
...  
Keyword(s):  
Lipid Bilayer ◽  
Atp Synthase ◽  
Planar Lipid Bilayer ◽  
Electrophysiological Properties ◽  
Fof1 Atp Synthase
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