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首页> 外文期刊>Journal of bacteriology >Role of TnrA in Nitrogen Source-Dependent Repression of Bacillus subtilis Glutamate Synthase Gene Expression
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Role of TnrA in Nitrogen Source-Dependent Repression of Bacillus subtilis Glutamate Synthase Gene Expression

机译:TnrA在枯草芽孢杆菌谷氨酸合酶基因表达中氮源依赖性抑制中的作用。

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摘要

Synthesis of glutamate, the cell's major donor of nitrogen groups and principal anion, occupies a significant fraction of bacterial metabolism. In Bacillus subtilis, the gltABoperon, encoding glutamate synthase, requires a specific positive regulator, GltC, for its expression. In addition, the gltABoperon was shown to be repressed by TnrA, a regulator of several other genes of nitrogen metabolism and active under conditions of ammonium (nitrogen) limitation. TnrA was found to bind directly to a site immediately downstream of the gltAB promoter. As is true for other genes, the activity of TnrA at the gltAB promoter was antagonized by glutamine synthetase under certain growth conditions.
机译:谷氨酸是细胞中氮基团和主要阴离子的主要供体,其合成占细菌代谢的很大一部分。在枯草芽孢杆菌中,编码谷氨酸合酶的 gltAB 操纵子需要特定的正向调节子GltC才能表达。另外,显示 gltAB 操纵子被TnrA抑制,TnrA是氮代谢的其他几种基因的调节剂,在铵(氮)限制条件下具有活性。发现TnrA直接与 gltAB 启动子下游的位点直接结合。就像其他基因一样,谷氨酰胺合成酶在一定的生长条件下拮抗 gltAB 启动子上的TnrA活性。

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