NDLI: X-ray diffraction study of lipid bilayer membranes interacting with amphiphilic helical peptides: diphytanoyl phosphatidylcholine with alamethicin at low concentrations.

Content Provider	PubMed Central
Author	Wu, Y. He, K. Ludtke, S. J. Huang, H. W.
Abstract	A variety of amphiphilic helical peptides have been shown to exhibit a transition from adsorbing parallel to a membrane surface at low concentrations to inserting perpendicularly into the membrane at high concentrations. Furthermore, this transition has been correlated to the peptides' cytolytic activities. X-ray lamellar diffraction of diphytanoyl phosphatidylcholine-alamethicin mixtures revealed the changes of the bilayer structure with alamethicin concentration. In particular, the bilayer thickness decreases with increasing peptide concentration in proportion to the peptide-lipid molar ratio from as low as 1:150 to 1:47; the latter is near the threshold of the critical concentration for insertion. From the decreases of the bilayer thickness, one can calculate the cross sectional expansions of the lipid chains. For all of the peptide concentrations studied, the area expansion of the chain region for each adsorbed peptide is a constant 280 +/- 20 A2, which is approximately the cross sectional area of an adsorbed alamethicin. This implies that the peptide is adsorbed at the interface of the hydrocarbon region, separating the lipid headgroups laterally. Interestingly, the chain disorder caused by a peptide adsorption tends to spread over a large area, as much as 100 A in diameter. The theoretical basis of the long range nature of bilayer deformation is discussed.
Related Links	http://dx.doi.org/10.1016/s0006-3495(95)80418-2
Ending Page	2369
Page Count	9
Starting Page	2361
File Format	PDF
ISSN	00063495
e-ISSN	15420086
Journal	Biophysical Journal
Issue Number	6
Volume Number	68
Language	English
Publisher Date	1995-06-01
Access Restriction	Open
Subject Keyword	Biophysics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biophysics

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