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  • 學位論文

功能性環化胍基衍生物的合成與其在質譜訊號強化之應用

Synthesis of Functional Cyclic Guanidino Derivatives and Their Application in the Signal Enhancement of Mass Spectrometer

指導教授 : 鄭建中 施增廉

摘要


微量蛋白質的偵測,在蛋白質體學研究中是非常具挑戰的主題。利用化學法修飾生物分子的帶電性,進而提升質譜訊號的靈敏度,則是目前具有潛力的解決方法之ㄧ。其中以胍基衍生物來修飾的胜肽,則是最值得注意的。然而其化學修飾物之官能基與訊號強度之間的關係並未探討。本論文將利用開發出新的環化合成方法,來製備出具推電子基、五環、六環、氫氧基及掌性異構之不同功能性之試劑,再與胜肽中離胺酸耦合成一系列的胍基衍生物,經由NMR 鑑定,高效能液相層析儀分析,及LC-MS/MS 確認這些胍基衍生物的形成。利用基質輔助雷射脫附游離質譜,將胰蛋白酶水解之肌紅蛋白中的ㄧ段胜肽與化學試劑耦合之結構與訊號強度之間的探討。經比對結果顯示,六環結構於質譜訊號強化15.1 倍、五環強化9.2 倍、推電子基強化12.3 倍、氫氧基強化7.6 倍與掌性異構強化12.3-12.4 倍。此結果顯示出,電荷的穩定性對訊號靈敏度的提升,具有決定性的影響,對後續研發ICAT 與iTRAQ 等蛋白質定量試劑具有相當重要的指標意義。

並列摘要


Detection of low abundant proteins is one of challenging topics in proteomics. Guanidino group was demonstrated to enhance the signal instensity in MALDI experiments. This report described a novel synthetic pathway to prepare the cyclic guanidino derivatives. The guanidino moiety was generated by O-ethylisourea and amino group of lysine-specific side chain. The characterization and identification was performed by NMR, HPLC, LC-MS/MS and MALDI. The result suggested the stabilization of positive charge at guanidino group plays an important role in signal enhancement of mass spectra of proteins. These results provide a further application in the ICAT and iTRAQ for protein quantification.

參考文獻


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