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歷 年 稿 件 內 容
 
*類別:
* 姓名: 張天耀
投稿種類: 壁報
*中文投稿標題: AdeR蛋白質與順反子區間的直接重複序列結合對於adeABC表現之調控
*中文作者姓名列:
*中文服務單位:
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*英文服務單位:
* 投稿摘要: Overexpression of the efflux pump AdeABC is associated with tigecycline resistance of multi-drug resistant Acinectobacter baumannii (MDRAB). The pump is regulated by a two-component regulatory system, sensor AdeS and regulator AdeR proteins. However, the detailed mechanism of the AdeR protein to enhance the expression of adeABC operon is not well defined. A wild type A. baumannii (AB260) and a clinical isolate (AB293) of TGC-resistant MDRAB with two point mutations (Met197Ile, Ser200Cys) on its AdeR protein were included in this study. AdeR proteins were applied to investigate the different binding characteristics between the promoter and the intercistronic spacer DNA fragment between adeRS and adeABC genes. By electrophoresis mobility shift assay, neither wild type nor mutant AdeR protein bound to the adeABC promoter DNA fragment. However, wild type AdeR protein strongly bound to the intercistronic spacer DNA fragment and the mutant AdeR protein demonstrated about 100 times lower binding activity to the same DNA fragment. A direct repeat motif was observed in the intercistronic spacer DNA and considered to be the AdeR binding site. Two residue mutations on AdeR protein may liberate the intercistronic spacer from binding. The free intercistronic spacer may support the successful read-through of adeABC operon by the cotranscriptional translation machinery in A. baumannii.
*關鍵字1 : Acinetobacter baumannii
*關鍵字2 : AdeR
*關鍵字3 : AdeABC
*關鍵字4 : efflux pump
*關鍵字5 : two component system
* 服務機關:
* 第一作者: 張天耀
* 身分字號: *****72648
其他投稿作者: 黃博君
身分字號: *****33061
其他投稿作者: 孫俊仁
身分字號: *****09647
其他投稿作者: 彭成立
身分字號: *****88806
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審查委員意見: 建議刊登
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