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首页> 外文期刊>Journal of bacteriology >Roles of PucR, GlnR, and TnrA in Regulating Expression of the Bacillus subtilis ure P3 Promoter
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Roles of PucR, GlnR, and TnrA in Regulating Expression of the Bacillus subtilis ure P3 Promoter

机译:PucR,GlnR和TnrA在调节枯草芽孢杆菌P3启动子表达中的作用

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Expression of the P3 promoter of the Bacillus subtilis ureABC operon is activated during nitrogen-limited growth by PucR, the transcriptional regulator of the purine-degradative genes. Addition of allantoic acid, a purine-degradative intermediate, to nitrogen-limited cells stimulated transcription of ure P3 twofold. Since urea is produced during purine degradation in B. subtilis, regulation of ureABC expression by PucR allows purines to be completely degraded to ammonia. The nitrogen transcription factor TnrA was found to indirectly regulate ure P3 expression by activating pucR expression. The two consensus GlnR/TnrA binding sites located in the ure P3 promoter region were shown to be required for negative regulation by GlnR. Mutational analysis indicates that a cooperative interaction occurs between GlnR dimers bound at these two sites. B. subtilis is the first example where urease expression is both nitrogen regulated and coordinately regulated with the enzymes involved in purine transport and degradation.
机译:枯草芽孢杆菌ureABC 操纵子P3启动子的表达在氮限制的生长过程中被嘌呤降解基因的转录调节子PucR激活。在氮限制的细胞中加入尿嘌呤酸(一种嘌呤降解的中间体)会刺激 ure P3的转录增加两倍。由于尿素是在B中嘌呤降解过程中产生的。枯草,PucR对 ureABC 表达的调节使嘌呤被完全降解为氨。发现氮转录因子TnrA通过激活 pucR 表达间接调控 ure P3表达。显示位于 ure P3启动子区域的两个共有的GlnR / TnrA结合位点是GlnR负调控所必需的。突变分析表明在这两个位点结合的GlnR二聚体之间发生了协同相互作用。 B。枯草杆菌是第一个例子,其中尿素酶的表达既受氮调节,又与嘌呤转运和降解所涉及的酶协调。

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