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記錄 編號 3862 狀態 NC090FJU00112010 助教 查核 索書 號 學校 名稱 輔仁大學 系所 名稱 生命科學系 舊系 所名 稱 學號 489346213 研究 許真妮 生(中) 研究 Khor Chin Ni 生(英) 論文 名稱 (中) 論文 名稱 (英) 青枯病菌插入序列 ISRso19 之選殖、特性分析及應用 Cloning, characterization and application of a new insertion sequence, ISRso19, in Ralstonia solanacearum 其他 題名 指導 教授 (中) 李永安 指導 教授 (英) Yung-An Lee 校內 全文 開放 日期 校外 全文 開放 日期 全文 不開 放理 由 電子 全文 送交 國圖. 國圖 全文 開放 日期. 檔案 說明 電子 全文 學位 類別 碩士 畢業 學年 度 90 出版 年 語文 別 中文 關鍵 青枯病菌 ISRso19 插入序列 字(中) 關鍵 Ralstonia solanacearum ISRso19 Insertion sequence 字(英) 摘要 (中) 本實驗以 subtractive hybridization 的方法,獲得一個 1.0-kb SalI 的核酸片 段,以此片段做為探針進行雜合反應,只有 race 2 菌株的 DNA 有多個雜 合片段,而 race 1 的菌株則沒有雜合片段產生。我們將此片段取名為 pS1.0k,並進行核酸定序,經序列比對結果及分析結果,顯示與 Yersinia pestis 的 IS100 有 59.6%的相似性。進一步選殖出含有此片段的 4.0-kb BamHI 核酸片段,經定序結果,發現 4.0-kb BamHI 核酸片段內含有一個 完整的插入序列。該插入序列長度為 1,956 bp,兩端具有長度為 29 bp 的 imperfect inverted repeat,並且在兩旁有 6-bp 的標定位置重複 (target site duplication)。此插入序列含有兩個 open reading frames,orf1 及 orf2 之間有 四個核酸彼此重疊(overlap)。orf1 的轉譯起始點可能有兩個,彼此均在同 一的讀序(reading frame)上,並且相隔七個 codon,分別可以轉譯出 338 及 331 個胺基酸的蛋白質,ORF1 具有跳躍酵素(transposase)特有的 D-57-D48-E motif 和 helix-turn-helix DNA-binding domain; orf2 可轉譯出的 262 個 胺基酸的蛋白質,ORF2 帶有高度保留的 NTP-binding domain 之 A 及 B motifs,這些為 IS21 族群成員的特徵,不過此序列與目前已知的 IS21 族 群的插入序列,僅有 39%~58%的核酸序列相同度,因此,該插入序列為 IS21 族群的新成員,經定名為 ISRso19 (Genbank accession no. AF450275)。 當以 ISRso19 內部核酸設計 PCR 引子對,並以 PCR 反應偵測多種植物病 原細菌時,發現只有青枯病菌 race 2 能擴增出預期的 PCR 產物,而青枯 病菌 race 1 及其他植物病原菌均未擴增出 PCR 產物。本實驗室先前研究 發現青枯病菌 race 1 含有其特有插入序列 IS1405 (屬 IS5 族群) (Appl. Environ. Microbiol. 67 (2001): 3943—3950),因此以 ISRso19 及 IS1405 合 用,可藉由 multiplex PCR 的方式,迅速區分青枯病菌 race 1 及 race 2。 除此之外,我們亦從 IS database 及 Genbank 資料庫中搜尋到青枯病菌的 其他 24 個插入序列,這些插入序列分布於七個族群中。當以 IS5 族群中 多個成員的 5’及 3’non-coding regions 核酸設計引子對,並以 PCR 反應 偵測多種青枯病菌時,各種菌株可依據不同的插入序列之引子對擴增出 預期的產物。本實驗結果進一步證實插入序列的 5’及 3’non-coding regions 可做為該插入序列的專一性標記,並且有些特定的插入序列只存 在於特定的病原細菌內,此特性有助對病原細菌研發出專一性 (specificity)及敏感性(sensitivity)高的偵測方法。 摘要 (英) A subtractive hybridization technique was employed to obtain DNA probe specific for Ralstonia solanacearum race 2. One cloned fragment hybridized under stringent conditions to DNA of race 2 strains, but not others race 1 strains. The clone was designated pS1.0k and then sequenced, amino acid sequence deduced from the nucleotide sequence showed homology of 59.6% to IS100 of Yersinia pestis. Further analysis of the region flanking this fragment showed structural features of a bacterial insertion sequence (IS) element. DNA sequence analysis indicated that this IS is 1956bp in length and delimited by two imperfect inverted repeats of 29bp with 8 mismatches. Besides, less conserved sequence elements, termed multiple terminal repeats, occur at both termini. Insertion of this IS into target site generate a direct repeat of 6bp. The G + C content of this IS is 64.37%. It consists of two adjacent open reading frames (orf), overlapping for 4bp. Nevertheless, two possible translational starts separated by seven codons were found in the orf1 gene. Therefore orf1 may encode for two polypeptides of 338 and 331 amino acids respectively. Both of the deduced amino acid sequence of ORF1 contains a conserved D-57-D-48-E motif and helix-turn-helix domain, whereas the protein of 262 amino acids deduced from ORF2 contains the A and B motifs of the NTP-binding site. These display characteristic features of members of IS21 family. Result of DNA homologies search by Fasta program in GCG showed that this element is having similarity of 39% to 58% to members of IS21 family. According to these characters and significant homology with similarly organized ORFs present in insertion sequences belonging to the IS21 family, this IS suggests to be a new member of IS21 family; hence, the name of ISRso19 was assigned by IS database (Genbank accession no. AF450275). Specific oligonucleotide primers were designed based on the internal nucleotide sequence of ISRso19. The PCR product of 683bp only can be amplified from Ralstonia solanacearum race 2 but neither in race 1 strains nor others phytopathogens. Since race 2 contain ISRso19 whereas strains in Taiwan (race 1 biovar 3 & 4) have its specific insert sequence, IS1405 which belong to IS5 family (Appl. Environ. Microbiol. 67 (2001): 3943—3950), thus by using multiplex PCR with these two IS specifically designed primers, race 2 can be distinguish from race 1. On the other hand, result of the IS database and Genbank searches displays other 24 types of Ralstonia solanacearum insertion sequence which are distribute between 7 IS family. Further investigation using PCR amplification with primers, which were designed based on the sequences of the 5’ and 3’non-coding regions of each IS5 family member, demonstrated that 5’ and 3’non-coding regions of IS are specific markers for each IS, and certain IS elements exist in certain bacteria. The results showed that IS was very useful for development of a specific and sensitive detection method for plant pathogenic bacteria. 論文 目次 參考 文獻 中文摘要--------------------------------------------------- I 英文摘要-------------------------------------------------- III 前言------------------------------------------------------- 1 材料與方法------------------------------------------------- 7 菌種及培養條件-------------------------------------------- 7 篩選篩選青枯病菌 race 2 專一性核酸片段---------------------- 7 雜合反應以及核酸序列定序----------------------------------- 8 插入序列的核酸與胺基酸序列分析----------------------------- 9 插入序列的命 名--------------------------------------------- 10 親緣關係樹的建立------------------------------------------ 10 ISRso19 插入位置鄰近片段之核酸分析------------------------- 10 以 ISRso19 的序列設計專一性 PCR 引子對------------------------- 11 青枯病菌基因組內插入序列分析------------------------------- 11 分生技術-------------------------------------------------- 12 實驗結果-------------------------------------------------- 22 篩選青枯病菌 race 2 專一性的核酸片段---------------- 22 插入 序列的核酸序列及胺基酸序列分析---------------- 22 ISRso19 和 IS21 family 中成員間的相似性-------------- 24 ISRso19 插入位置鄰近片段之核酸分析---------------- 26 ISRso19 在青枯病菌中存在情形與差異----------------- 26 ISRso19 在其他植物病原細菌中的存在情形------------- 26 以 ISRso19 及 IS1405 序列設計的 PCR 引子對檢測青枯病菌-- 27 青枯病菌基因組內插入 序列分析---------------------- 27 討論------------------------------------------------------ 31 參考文獻--------------------------------------------------- 40 表-------------------------------------------------------- 48 圖--------------------------------------------------------62 徐世典. 1977. 茄科植物青枯病菌在土壤及番茄罹病組織內之生存。植病 會刊 19:133-139. 徐世典. 1991. 台灣植物青枯病菌之生態與防治。植保會 刊 33:72-79. 陳文彥. 1978. 台灣煙草立枯病病原細菌菌系的特性研究。煙 試彙報 9:71-80. 楊宗皇、徐世典、曾國欽. 1980. 天堂鳥花青枯病菌之研 究。農林學報 29:-119-133. 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Science 196: 170-2. 9 論文 頁數 96 附註 全文 點閱 次數 資料 建置 時間 轉檔 日期 全文 檔存 取記 錄 異動 記錄 M admin Y2008.M7.D3 23:17 61.59.161.35