期刊
NUCLEIC ACIDS RESEARCH
卷 41, 期 3, 页码 1767-1782出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gks1203
关键词
-
资金
- Higher Education Commission of the Pakistan Government
- ERA-NET SysMO Project (STREAM) [GEN2006-27745-E/SYS, FKZ 0315003]
- Spanish Comision Interministerial de Ciencia y Tecnologia (CICYT) [BIO2010-16094]
- CICYT [BIO2010-16094]
Interaction of regulatory networks is a subject of great interest in systems biology of bacteria. Phosphate control of metabolism in Streptomyces is mediated by the two-component system PhoR-PhoP. Similarly, the utilization of different nitrogen sources is controlled by the regulator GlnR. Transcriptomic and biochemical analysis revealed that glnA (encoding a glutamine synthetase), glnR and other nitrogen metabolism genes are under PhoP control. DNA-binding experiments showed that PhoP binds to other nitrogen-regulated genes (SCO0255, SCO01863 and ureA). Using the glnA promoter as model, we observed that PhoP and GlnR compete for binding to the same promoter region, showing GlnR a higher affinity. Using a total of 14 GlnR-binding sites (50 direct repeat units) we established two information-based models that describe the GlnR box as consisting of two 11-nt direct repeats each with clear differences to PHO box. DNA-binding studies with different mutant sequences of glnA promoter revealed that the sequence recognized by GlnR is found in the coding strand whereas that recognized by PhoP is overlapping in the non-coding strand. In amtB promoter PhoP and GlnR boxes are not totally overlapping and both proteins bind simultaneously. PhoP control of nitrogen metabolism genes helps to balance the cellular P/N equilibrium.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据