2009-09-01, English, Article, Journal or magazine article edition: Membrane-mediated repulsion between gramicidin pores. Constantin, Doru

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Physical Description
  • Magazine/​Journal article
Published
  • Elsevier B.V., 2009 Sept
Language
  • English

Edition details

Title
  • Membrane-mediated repulsion between gramicidin pores.
Appears In
  • BBA - Biomembranes, v.1788, no.9, 2009 Sept, p.1782(8) (ISSN: 0005-2736)
Author
  • Constantin, Doru
Published
  • Elsevier B.V., 2009 Sept
Physical Description
  • Magazine/​Journal article
Subjects
Target Audience
  • Academic
Summary
  • To link to full-text access for this article, visit this link: http:/​/​dx.doi.org/​10.1016/​j.bbamem.2009.05.007 Byline: Doru Constantin Keywords: Gramicidin; Small-angle X-ray scattering; In-plane interaction; Hydrophobic mismatch Abstract: We investigated the X-ray scattering signal of highly aligned multilayers of the zwitterionic lipid 1,2-dilauroyl-sn-glycero-3-phosphatidylcholine containing pores formed by the antimicrobial peptide gramicidin as a function of the peptide/lipid ratio. We are able to obtain information on the structure factor of the pore fluid, which then yields the interaction potential between pores in the plane of the bilayers. Aside from a hard core with a radius close to the geometric radius of the pore, we find a repulsive exponential lipid-mediated interaction with a decay length of 2.5 A and an amplitude that decreases with the pore concentration, in agreement with the hydrophobic matching hypothesis. In dilute systems, the contact value of this interaction is about 30 k.sub.BT. Similar results are obtained for gramicidin pores inserted within bilayers formed by the nonionic surfactant pentaethylene glycol monododecyl ether. Author Affiliation: Laboratoire de Physique des Solides, Universite Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France Article History: Received 15 January 2009; Revised 6 May 2009; Accepted 12 May 2009
Terms of Use
  • COPYRIGHT 2009 Elsevier B.V.
Language
  • English
Database
  • Gale Academic OneFile
Identifier
  • 206400219

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