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題 名 | IS1403 and IS1404: Analysis and Distribution of Two New Insertion Sequences in Xanthomonas campestris=IS1403及IS1404:兩個Xanthomonas campestris的新插入序列的分析及分布 |
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作 者 | 李永安; 邱淑萍; | 書刊名 | Botanical Bulletin of Academia Sinica |
卷 期 | 39:4 1998.10[民87.10] |
頁 次 | 頁231-239 |
分類號 | 373.9 |
關鍵詞 | 軟腐病菌; 插入序列; 假單孢菌; 十字花科黑腐病菌; Erwinia; Insertion sequence; IS1403; IS1404; Pseudomonas; Xanthomonas campestris; |
語 文 | 英文(English) |
中文摘要 | Xanthomonas campestris pv.juglandis具有一段重複序列,經核酸定序與分析結 果,發現該序列中含有一個插入序列,並經命名為IS1403。另外X.campestris pv. campestris 亦含有一段與IS1403相同性達91%的插入序列,IS1404。IS1403及IS1404均具有42 bp之 inverted repeat,並且兩端有4-bp target site duplications。IS1403及IS1404插入位置 的兩端核酸序列,彼此間並無相似性。IS1403的兩端核酸列的G+C含量為45%,而IS1404則為 74%。IS1403及IS1404皆有二個以GTG為起始密碼的轉譯架構(orfA及orfB)。orfA及orfB的讀 序並不相同,orfB相對於orfA為phase-1。此外,orfA及orfB間有A�矮 motif,其後具有一 含7bp的stem-loop之pseudoknot結構,與IS3 family之插入序列及反轉錄病毒的-1 translational frameshift motif有極高相似性。orfA及orfB的可能基因產物分別含有一個 α-helix-turn-α-helix DAN-binding motif及一個transposase含有的DD(35)E motif。 依據IS1403及IS1404的上述特性,此兩插入序列與Pseudomonas cepacia的IS407、X.campestris pv. vesicatoria的IS476、Enterobacter agglomerans的IS1222、及Rhizobuim lupini的ISR1 同屬於IS3 family。但在核酸序列上,此兩插入序列與IS3 family 之其他插入序列只有 40%-60%的相似性,因此,IS1403及IS1404為IS3 family的新成員。此插入序列廣泛分佈在 X. campestris病原小種中,但不存於其它植物病原細菌中,例如Pseudomonas syringae pv. apii, P. syringae pv. tabaci, P. syringae pv. glycinea, P. syringae pv. coronafaciens, Erwinia amylovora, E. carotovora, 及E. cypripedii等。 |
英文摘要 | A repetitive sequence in Xanthomonas campestris pv. juglandis was identified as a new insertion sequence, IS1403, by nucleotide sequence analysis. A homologous IS, IS1404, was also cloned from X. campestris pv. campestris. Both shared at least 91% identity on a nucleotide level. The sequences had 42-bp terminal inverted repeat sequences with eleven mismatches, and were flanked by 4-bp target site duplications. Comparison of target insertion sites flanking IS1403 and IS1404 revealed no similarities, and the G+C content of the flanking sequences of IS1403 was 45%, but that of IS1404 was 74%, indicating the elements transpose quite randomly and do not prefer A-T-rich regions. IS1403 and IS1404 contained two GTG-initated open reding frames (orfA and orfB), and orfB was in phase-1 relative to orfA. There was an A�矮 motif followed by a potential stem-loop structure between two reading frames, which may have promoted a-1 translational frameshift to produce a transframe protein. The deduced amino acid sequences of orfA and orfB contained a potential α-helix- turnα-helix DNA-binding motif and a D,D(35)E domain of transposases, respectively. Based on the features discusse, IS1403 and IS1404 were placed among the IS3 family with IS407 from Pseudomonas cepacia, IS476 from X. campestris pv. vesicatoria, IS1222 from Enterobacter agglomerans, ans ISR1 from Rhizobium lupini. The insertion sequences were widely distributed and existed in multiple copies in most pathovars of X. campestris, but other plant pathogenic bacteria, such as P. syringae pv. apii, P. syringae pv. tabaci, P. syringae pv. glycinea, P. syringae pv. coronafaciens, Erwinia amylovora, E. carotovara, and E. cypripedii, did not contain this insertion sequence based on Southern hybridization tests. |
本系統中英文摘要資訊取自各篇刊載內容。