Transcription from bacteriophage pR promoter is regulated independently and antagonistically by DksA and ppGpp
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چکیده
منابع مشابه
Transcription from bacteriophage λ pR promoter is regulated independently and antagonistically by DksA and ppGpp
The stringent response effector, guanosine tetraphosphate (ppGpp), adjust gene expression and physiology in bacteria, by affecting the activity of various promoters. RNA polymerase-interacting protein, DksA, was proposed to be the co-factor of ppGpp effects; however, there are reports suggesting independent roles of these regulators. Bacteriophage lambda major lytic promoter, pR, is down-regula...
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The activities of promoters can be temporally and conditionally regulated by mechanisms other than classical DNA-binding repressors and activators. One example is the inherently weak σ(70)-dependent Pr promoter that ultimately controls catabolism of phenolic compounds. The activity of Pr is up-regulated through the joint action of ppGpp and DksA that enhance the performance of RNA polymerase at...
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Collisions between paused transcription elongation complexes and replication forks inevitably happen, which may lead to collapse of replication fork and could be detrimental to cells. Bacterial transcription factor DksA and its cofactor alarmone ppGpp were proposed to contribute to prevention of such collisions, although the mechanism of this activity remains elusive. Here we show that DksA/ppG...
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The expression of type 1 fimbriae is dependent on the intracellular levels of ppGpp through stimulation of fimB transcription. Here we show that in contrast to the previously described decreased fimbriation observed in a ppGpp-deficient strain, DksA deficiency results in a hyperfimbriated state. In vivo assays show that the effect of DksA deficiency on the type 1 fimbriae occurs at the phase va...
متن کاملDirect regulation of Escherichia coli ribosomal protein promoters by the transcription factors ppGpp and DksA.
We show here that the promoters for many of the Escherichia coli ribosomal protein operons are regulated directly by two transcription factors, the small RNA polymerase-binding protein DksA and the nutritional stress-induced nucleotide ppGpp. ppGpp and DksA work together to inhibit transcription initiation from ribosomal protein promoters in vitro and in vivo. The degree of promoter regulation ...
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ژورنال
عنوان ژورنال: Nucleic Acids Research
سال: 2009
ISSN: 0305-1048,1362-4962
DOI: 10.1093/nar/gkp676