中大機構典藏-NCU Institutional Repository-提供博碩士論文、考古題、期刊論文、研究計畫等下載:Item 987654321/4066
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 70548/70548 (100%)
造访人次 : 23121268      在线人数 : 332
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/4066


    题名: 鹼性胜?抗生素indolicidin及其類似物之溶血作用機制探討;Mechanism of hemolytic action of antimicrobial peptide indolicidin and its analogs
    作者: 王常旭;Chang-Hsu Wang
    贡献者: 化學工程與材料工程研究所
    关键词: 螢光光譜;胜肽聚集;hemolytic activity;peptide aggregation;fluorescence spectrum;indolicidin
    日期: 2008-06-26
    上传时间: 2009-09-21 12:30:00 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: ndolicidin有廣泛的抗生活性,可以用來對抗多種細菌、黴菌與病毒,但是少許的溶血活性限制了它的應用。本研究主要探討鹼性胜肽抗生素indolicidin (IL)造成溶血的原因,我們將其第8與第9位置的tryptophan(Trp)置換為phenylalanine而成為ILF89,測量IL與ILF89的抗生與溶血活性,並搭配tryptophan的螢光光譜探究IL及ILF89與膜之作用機制。在生物活性檢測上,發現ILF89不僅維持與IL相當的抗菌性,其溶血活性相較於IL有大幅降低,此證實W8與W9與胜肽的溶血性確實相關。而從IL及ILF89於水相的螢光光譜,發現在低濃度時,具有5個Trp的IL,其螢光強度卻低於僅有3個Trp的ILF89,因此推測IL可能會以寡聚體的形式存在而降低自身螢光。另外,我們也進一步探討胜肽與POPC (1-Palmitoyl-2-Oleoyl-sn- Glycero-3-Phosphocholine)或POPC/POPG (1-Palmitoyl-2-Oleoyl-sn- Glycero-3-[Phospho-rac-(1-glycerol)])微脂粒間的作用,發現IL與磷脂膜共存的系統,單位Trp的螢光值大幅提高,推測此為寡聚體的IL,於吸附於膜面後散開所致;而ILF89雖也有類似的表現,但單位Trp產生的螢光升高有限,因此推測ILF89產生寡聚體較小。配合其他文獻的觀察,我們認為W8、W9與胜肽的聚集很有關係,而胜肽的聚集在其溶血活性上扮演著重要的角色。 Indolicidin has broad spectrum of antimicrobial activity against Gram-positive and Gram-negative bacteria, fungi, and virus. However, a limitation to the expression of indolicidin in therapeutic application is its hemolytic activiry. In this study, we focus on the reason of hemolysis of indolicidin. Here, a new indolicidin’s analog ILF89, where the tryptophan at the 8th, and 9th position replaced by phenylalanine, is designed to decrease hemolytic activity. We measure the antimicrobial and hemolytic activity of indolicidin and its analogs, and investigate the mechanism of peptides with the help of fluorescence spectrum. ILF89 remains good antimicrobial activity and substantially decreases the hemolytic activity in biological assay. It demonstrates that W8 and W9 are related to hemolysis of peptides. In the fluorescence spectrum for IL and ILF89 in aqueous phase, the fluorescence intensity of IL with five tryptophans is lower than that of ILF89 with three tryptophans. We conjecture that IL may aggregate in oligomer form at low concentration in aqueous phase and decrease self-fluorescence. In addition, we research the interaction between peptides and POPC or POPG/POPC liposomes. The unit of tryptophan intensity substantially rises in IL and liposomes coexistence system. We infer that IL aggregates disperse after its adsorption to liposomes. ILF89 has similar exhibition but the unit of tryptophan intensity is lower than that of IL. Thus, we think that the oligomers of ILF89 are smaller than that of IL. According to the observation of other literatures, we consider that W8 and W9 are related to peptide aggregation, which plays an important role in hemolytic activity.
    显示于类别:[化學工程與材料工程研究所] 博碩士論文

    文件中的档案:

    档案 大小格式浏览次数


    在NCUIR中所有的数据项都受到原著作权保护.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈  - 隱私權政策聲明