Transcriptional Control of the Bradyrhizobium japonicum irr Gene Requires Repression by Fur and Antirepression by Irr
نویسندگان
چکیده
منابع مشابه
Positive control of ferric siderophore receptor gene expression by the Irr protein in Bradyrhizobium japonicum.
Ferric siderophore receptors are components of high-affinity iron-chelate transport systems in gram-negative bacteria. The genes encoding these receptors are generally regulated by repression. Here, we show that the ferrichrome receptor gene bll4920 and four additional putative ferric siderophore receptor genes in Bradyrhizobium japonicum are positively controlled by the regulatory protein Irr,...
متن کاملFur-independent regulation of iron metabolism by Irr in Bradyrhizobium japonicum.
Bradyrhizobium japonicum expresses both Fur and Irr, proteins that mediate iron-dependent regulation of gene expression. Control of irr mRNA accumulation by iron was aberrant in a fur mutant strain, and Fur repressed an irr::lacZ promoter fusion in the presence of iron. Furthermore, metal-dependent binding of Fur to an irr gene promoter was demonstrated in a region with no significant similarit...
متن کاملThe Bradyrhizobium japonicum Irr protein is a transcriptional repressor with high-affinity DNA-binding activity.
The Irr protein is a global regulator of iron homeostasis in Bradyrhizobium japonicum, and a subset of genes within the Irr regulon are negatively controlled under iron limitation. However, repressor function, high-affinity DNA binding in vitro, or promoter occupancy in vivo of Irr for a negatively regulated gene has not been demonstrated. Here, we show that the blr7895 and bll6680 genes are ne...
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در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...
15 صفحه اولHmuP is a coactivator of Irr-dependent expression of heme utilization genes in Bradyrhizobium japonicum.
Utilization of heme as an iron source by Bradyrhizobium japonicum involves induction of the outer membrane heme receptor gene hmuR and other genes within the heme utilization locus. Here, we discovered the hmuP gene located upstream of hmuR and transcribed divergently from it along with hmuTUV. hmuP encodes a small protein that accumulated under iron limitation and is transcriptionally controll...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 2010
ISSN: 0021-9258
DOI: 10.1074/jbc.m110.145979