Pore-spanning lipid membrane under indentation by a probe tip a molecular dynamics simulation study

Pore-spanning lipid membrane under indentation by a probe tip : a molecular dynamics simulation study

© 2011 American Chemical Society

Bibliographische Detailangaben
Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1992. - 27(2011), 19 vom: 04. Okt., Seite 11930-42
1. Verfasser: Huang, Chen-Hsi (VerfasserIn)
Weitere Verfasser: Hsiao, Pai-Yi, Tseng, Fan-Gang, Fan, Shih-Kang, Fu, Chien-Chung, Pan, Rong-Long
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2011
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Membranes, Artificial
Beschreibung
Zusammenfassung:© 2011 American Chemical Society
We study the indentation of a free-standing lipid membrane suspended over a nanopore on a hydrophobic substrate by means of molecular dynamics simulations. We find that in the course of indentation the membrane bends at the point of contact and the fringes of the membrane glide downward intermittently along the pore edges and stop gliding when the fringes reach the edge bottoms. The bending continues afterward, and the large strain eventually induces a phase transition in the membrane, transformed from a bilayered structure to an interdigitated structure. The membrane is finally ruptured when the indentation goes deep enough. Several local physical quantities in the pore regions are calculated, which include the tilt angle of lipid molecules, the nematic order, the included angle, and the distance between neighboring lipids. The variations of these quantities reveal many detailed, not-yet-specified local structural transitions of lipid molecules under indentation. The force-indentation curve is also studied and discussed. The results make a connection between the microscopic structure and the macroscopic properties and provide deep insight into the understanding of the stability of a lipid membrane spanning over nanopore
Beschreibung:Date Completed 26.01.2012
Date Revised 28.09.2011
published: Print-Electronic
Citation Status MEDLINE
ISSN:1520-5827
DOI:10.1021/la201977d