کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
600315 1454298 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The influence of cardiolipin on phosphatidylglycerol/phosphatidylethanolamine monolayers—Studies on ternary films imitating bacterial membranes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
The influence of cardiolipin on phosphatidylglycerol/phosphatidylethanolamine monolayers—Studies on ternary films imitating bacterial membranes
چکیده انگلیسی

In this work the properties of ternary systems composed of phosphatidylethanolamines (PEs), phosphatidylglycerols (PGs) and cardiolipin (CL) were studied with the Langmuir monolayer technique and Brewster Angle Microscopy. In all the investigated mixed films the PE:PG = 3:1, which reflects the proportion of these lipids classes in various Gram Negative bacteria. The content of cardiolipin was varied from 5 to 20%, which is in the range of CL concentration in bacterial membranes. The experiments were performed for POPE/POPG/CL and POPE/DPPG/CL films spread on water subphase and on NaCl solution. It was found that the components of the studied films mix nonideally in the investigated range of the composition, however, the addition of cardiolipin weakens the interactions between the molecules. Thermodynamically unfavorable influence of CL results from the structure of this lipid, which due to sterical reasons disturbs the organization of POPE/PG film. It was also found that the presence of sodium ions in the subphase causes the increase of the area per molecule values and in general weakens the interactions between molecules in ternary films. However, the foregoing effect of NaCl both on binary PE/PG films as well as ternary PE/PG/CL monolayers was stronger on DPPG-containing films. The analysis of the collected data evidenced that the influence of cardiolipin as well as inorganic electrolyte on the properties of the studied films is directly connected with molecular structure of monolayers components.

Figure optionsDownload as PowerPoint slideHighlights
► Phosphatidylethanolamine/phosphatidylglycerol/cardiolipin mixed monolayers.
► Cardiolipin and sodium ions weaken the interactions in the studied monolayers.
► Sodium ions much strongly affect the film containing saturated phosphatidylglycerol.
► Cardiolipin and sodium ions modify organization of model bacterial membranes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces B: Biointerfaces - Volume 106, 1 June 2013, Pages 217–223
نویسندگان
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