| Electrostatic potential barrier in asymmetric planar lipopolysaccharide/phospholipid bilayers probed with the valinomycin-K+ complex. | |
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MedLine Citation:
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PMID: 1449594 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Using the carrier-ion complex valinomycin-K+, current/voltage (I/U) characteristics were registered for planar asymmetric lipid bilayers composed on one side of a phospholipid mixture and on the other side of rough mutant lipopolysaccharide. This system resembles the lipid matrix of the outer membrane of Gram-negative bacteria. The evaluation of the current/voltage curves yielded a highly asymmetric electrical potential barrier. The total potential difference between the phospholipid and the lipopolysaccharide was -85 mV, a result which cannot be explained by contributions of Gouy-Chapman potentials alone. The possible contribution of dipole potentials and influences of headgroup effects are discussed. It is shown that the asymmetry of the I/U-characteristic results from the differences of the surface charge densities of the two monolayers but not from those of the states of order of their hydrocarbon chains. |
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Authors:
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U Seydel; W Eberstein; G Schröder; K Brandenburg |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Zeitschrift für Naturforschung. C, Journal of biosciences Volume: 47 ISSN: 0939-5075 ISO Abbreviation: Z. Naturforsch., C, J. Biosci. Publication Date: 1992 Sep-Oct |
Date Detail:
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Created Date: 1993-01-07 Completed Date: 1993-01-07 Revised Date: 2009-11-04 |
Medline Journal Info:
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Nlm Unique ID: 8912155 Medline TA: Z Naturforsch C Country: GERMANY |
Other Details:
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Languages: eng Pagination: 757-61 Citation Subset: IM |
Affiliation:
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Forschungsinstitut Borstel, Borstel, Bundesrepublik Deutschland. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Carbohydrate Sequence Electric Conductivity Escherichia coli Lipid Bilayers* Lipopolysaccharides / chemistry* Mathematics Membrane Potentials Models, Theoretical Molecular Sequence Data Phospholipids / chemistry* Potassium* Valinomycin* |
| Chemical | |
Reg. No./Substance:
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0/Lipid Bilayers; 0/Lipopolysaccharides; 0/Phospholipids; 2001-95-8/Valinomycin; 7440-09-7/Potassium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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