The morphology of DPPC/DOPC bilayers on mica and the substrate effect: an AFM study

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姓名

邱顯翔(Syan-Syang Chyou) 查詢紙本館藏

畢業系所

生物物理研究所

論文名稱

(The morphology of DPPC/DOPC bilayers on mica and the substrate effect: an AFM study)

相關論文

★ 用氘核磁共振儀研究含高濃度麥角脂醇的DPPC人造膜之分子交交互作用	★ Fluorescence study of lipid membranes containing sterol
★ 含固醇的脂質雙層膜的形態及相行為的研究	★ The effects of composition and thermal history on the properties of supported lipid bilayers
★ The effect of sterol on the POPE/DPPC membranes	★ 麥角固醇對含膽固醇的脂雙層膜的影響
★ Deuterium NMR Study of the Effect of Stigmasterol on POPE Membranes	★ Deuterium NMR Study of the effect of 7- dehydrocholesterol on the POPE Membranes
★ 運用氘核磁共振儀研究POPC/cholesterol膜之物理性質	★ 模型細胞膜(含有相同碳鏈的PC/PE)存在或缺乏固醇類的物理性質
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摘要(中)

平鋪在基板(如:雲母片)上的脂質雙層 (supported lipid bilayer)，常被當成研究細胞膜的模型，且已被廣泛使用在生物物理相關領域。但雲母片 (mica) 對脂質雙層的影響少有研究。我們利用原子力顯微鏡探測在雲母片和在POPC塗佈雲母片 (POPC-coated mica) 上的1:1 DPPC/DOPC表面形貌，本研究中大部分的量測是在液體環境中進行。為了在液態環境中鋪平脂質雙層，我們使用不同方法製作脂質雙層，相較旋轉塗佈方法 (spin coating)，脂球融合方法 (vesicle fusion) 所製備的樣品在液態環境中有更好的品質。1:1 DPPC/DOPC 脂質雙層平鋪在POPC塗佈雲母片上的AFM影像，顯示出兩種脂質雙層厚度分布：較厚的脂質雙層推測對應到“富含DPPC的膠態區塊”(DPPC-rich gel phase domain) ; 較薄的脂質雙層推測對應到“富含DOPC的液態區塊”(DOPC-rich liquid crystalline phase domain)。且POPC塗佈雲母片上的脂質雙層和懸浮的多層脂球 (multilamellar vesicle) 有著相似的相變溫度 (gel-to-liquid crystalline transition temperature)，顯示在POPC塗佈雲母片上，脂質雙層可近似懸浮樣品。另一方面，在雲母片上的1:1 DPPC/DOPC有較高的相變溫度，此結果指出雲母片會迫使脂質雙層排列更緊密有序，而藉由預先塗佈一層POPC脂質雙層，夾在1:1 DPPC/DOPC 脂質雙層和雲母片之間，可減少此有序效應。此外，我們推測雲母片-脂質單層相互影響 (mica- leaflet interaction)和脂質雙層間相互影響 (inter-leaflet coupling) 可能是決定脂質雙層對稱性質 (bilayer symmetry) 的因素，這方面的研究還必須做更進一步的實驗驗證。

摘要(英)

Supported planar lipid bilayers are versatile models of the biological membrane, which have been widely used in biophysical studies. However, limited consideration has been given to the effect of mica on the lipid bilayer. In this thesis, we study the morphology of the 1:1 DPPC/DOPC bilayer on mica and on POPC-coated mica using atomic force microscopy (AFM). Most of AFM images were acquired in buffer. To obtain a good-quality sample, bilayers prepared from different methods were compared. We found that the bilayer prepared from vesicle fusion yields better quality for imaging in buffer and shorter preparation time than that from spin coating. The images of 1:1 DPPC/DOPC bilayer on POPC-coated mica display two different bilayer thicknesses. The thicker and thinner bilayers, presumably correspond to the DPPC-rich gel phase and DOPC-rich liquid crystalline phase, respectively. We found that this bilayer on POPC-coated mica can be regarded as a free-standing bilayer effectively as it has a gel-to-liquid crystalline transition temperature close to that of the bilayers in multilamellar vesicle suspension. In contrast, the 1:1 DPPC/DOPC bilayer on mica exhibits a higher gel-to-liquid crystalline transition temperature, suggesting that mica induces an ordering effect on the lipid bilayer. This effect can be reduced by inserting a POPC bilayer between the 1:1 DPPC/DOPC bilayer and mica. Furthermore, there is a slight indication that the mica-leaflet interaction and and inter-leaflet coupling may dominate in bilayers on mica and on POPC-coated mica, respectively, which may result in different bilayer symmetry. Further studies will be needed to examine this in detail.

關鍵字(中)

★ 原子力顯微鏡
★ 脂質
★ SLB
★ POPC
★ lipids
★ spin coating
★ vesicle fusion
★ substrate effect
★ melting temperature
★ membrane
★ AFM
★ 雲母片
★ mica
★ 細胞膜
★ 生物物理
★ DOPC
★ DPPC

關鍵字(英)

★ vesicle fusion
★ spin coating
★ membrane
★ DPPC
★ POPC
★ melting temperature
★ substrate effect
★ mica
★ lipids
★ DOPC
★ SLB
★ AFM

論文目次

Abstract in Chinese I
Abstract II
Acknowledgements III
Contents IV
List of Figures VI
Chapter 1 Introduction 1
1.1 The structure of lipid membrane 1
1.2 Background and experiment motive 2
1.3 Model membranes 5
Chapter 2 Atomic Force Microscopy 7
2.1 Working principle 9
2.2 Piezoelectric scanner 10
2.3 Imaging modes 11
Chapter 3 Sample Preparation 14
3.1 Materials 14
3.2 Supported lipid bilayer (SLB) prepared by the
vesicle fusion method 15
3.2.1 Preparation of mutilamellar vesicles (MLVs) 15
3.2.2 Unilamellar vesicles (LUVs) prepared from MLVs 15
3.2.3 Supported lipid bilayer (SLB) prepared from LUVs16
3.3 Supported lipid bilayer prepared by spin coating
method 16
3.4 Determination of the optimal value of
lipid/chloroform ratio 17
Chapter 4 DPPC/DOPC Prepared by Spin-Coating 20
4.1 DPPC/DOPC in air 20
4.2 The effect of the water layer between the membrane
and mica 23
4.3 1:1 DPPC/DOPC in buffer 25
Chapter 5 1:1 DPPC/DOPC Prepared by Vesicle Fusion 27
5.1 1:1 DPPC/DOPC on mica 27
5.2 1:1 DPPC/DOPC + 1mol% NBD-DOPE by fluorescence
microscopy: study of membrane symmetry 31
5.3 Pure POPC on mica 36
5.4 1:1 DPPC/DOPC on POPC-coated mica 39
Chapter 6 Discussion 41
Chapter 7 Conclusions 45
References 47

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指導教授

薛雅薇(Ya-Wei, Hsueh)

審核日期

2009-7-21

推文