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研究生(外文):Hui-Min Chen
論文名稱(外文):A Large-Scale Pull-Down Assay to Screen for Direct-Interacting Proteins of Echinoid
指導教授(外文):Jui-Cho Hsu
外文關鍵詞:DrosophilaechinoidEmbryo ExtractsPull-Down
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本論文的研究主題在於尋找和果蠅基因echinoid有直接交互作用的其他蛋白質分子。echinoid (ed)是一個位在細胞膜上的cell adhesion molecule。它已經被證明參與在果蠅複眼與胸部剛毛的發育過程中,其本身是一個EGFR訊號傳遞的負調控因子並且和Notch共同作用在神經元的生成機制上。

在此,我們進行了一個大規模的Pull-Down實驗,用來尋找和Ed蛋白直接或間接交互作用的其他蛋白質,希望藉此能讓我們對ed這個基因的功能有更進一步的了解。在我們的實驗中總共找到了53個蛋白質,再經過質譜儀的分析,我們將它們每個胜肰的身份鑑定出來。在它們之中,我們再依偏好挑選出12個基因,成為接下來研究的目標。其中,有6個於驗證用的一對一in vitro Pull-Down實驗,被我們證明與Ed有直接的交互作用。若依照與Ed蛋白互相黏著的強度順序來排列,這6個基因分別是CG6459,jaguar,coronin,RACK1,CG3957和ran1(由強至弱)。這些基因在之前的文獻上,已經被報導參與在各式各樣的生物現象中,諸如:訊號傳遞、細胞移動、細胞骨架運作、細胞內微泡運輸、細胞分裂增殖與細胞核質間傳輸。

The focus of this thesis is centered on the gene echinoid (ed), which is a cell adhesion molecule integral to the plasma membrane. ed has been previously shown to be involved in the development of Drosophila compound eyes and notum bristles. It is a negative regulator of EGF receptor signaling pathway and synergizes with Notch in mesothorax bristle patterning.

Here, we performed a large-scale pull-down assay to screen for Ed direct-interacting proteins in order that we could understand how ed executed its multiple biological functions. A total of 53 proteins were identified in this assay, and twelve of them were selected as possible candidates and taken for further studies. Among these genes, six were proved to interact specifically with Ed in vitro. They were CG6459, jaguar, coronin, RACK1, CG3957 and ran, ranked and mentioned following their binding strength to Edintra (from strong to weak). These genes were formerly reported to be involved in diverse cellular processes, such as signal transduction, cell movement, cytoskeleton arrangement, vesicle transport, cell proliferation and even nuclear transport.

Nonetheless, the project presented here is only the initial work of the research on echinoid. We need more biological evidence to prove these plausible candidates as true and meaningful research targets. Hopefully, in the end, several of them will reveal some interesting processes ed has taken a part in and help us gain a whole view of the physiological versatility of this membrane protein, Ed.
Part I: A Large-Scale Pull-Down Assay to Screen for Direct-Interacting Proteins of Echinoid

中文摘要 1

Abstract 2

Introduction 3

Materials and Methods 7

Results and Discussion 18

Reference 41

Figures 49

Tables 57

Part II: The Drosophila Deficiency Line Df(3R)sbd105 Deletes A Chromosomal Fragment Possibly Containing A Gene Involving in Notch Signaling Pathway

Abstract 60

Introduction 61

Materials and Methods 62

Results 63

Reference 65

Figures and Tables 66
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Part II

Bai J.M., Chiu W.H., Wang J.C., Tzeng T.H., Perrimon, N. and Hsu J.C. (2001) The cell adhesion molecule Echinoid defines a new pathway that antagonizes the Drosophila EGF receptor signaling pathway. Development, Vol. 128, 591-601.

Escudero, L.M., Wei S.Y., Chiu W.H., Modolell, J. and Hsu J.C. (2003) Echinoid synergizes with the Notch signaling pathway in Drosophila mesothorax bristle patterning. Development, Vol. 130, 6305-6316.

Norga, K.K., Gurganus, M.C., Dilda, C.L., Yamamoto, A., Lyman, R.F., Patel, P.H., Rubin, G.M., Hoskins, R.A., Mackay, T.F. and Bellen, H.J. (2003) Quantitative analysis of bristle number in Drosophila mutants identifies genes involved in neural development. Current Biology, Vol. 13, 1388-1397.
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