کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1940626 1050785 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Regulation of superoxide stress in Pseudomonas putida KT2440 is different from the SoxR paradigm in Escherichia coli
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Regulation of superoxide stress in Pseudomonas putida KT2440 is different from the SoxR paradigm in Escherichia coli
چکیده انگلیسی

In Escherichia coli, the SoxR regulon orchestrates genes for defense against certain types of oxidative stress through the SoxR-regulated synthesis of the SoxS transcription activator. The Pseudomonas putida genome did not reveal a clear soxS homolog. The P. putida SoxR protein appears to be functional: its expression in an E. coli ΔsoxR strain restored the paraquat inducibility of soxS. Of nine candidate P. putida oxidative stress genes, which are known to be SoxR regulon in E. coli, tested for response to superoxide or nitric oxide, fumC-1, sodA, zwf-1, and particularly fpr, encoding ferredoxin:NADP+ reductase, were induced, all independent of P. putida soxR. Disruption of the fpr and finR, a regulatory protein that is required for paraquat-dependent expression of the fpr, resulted in more oxidative stress sensitivity. However, a P. putida soxR-deletion strain had normal resistance to the superoxide-generating agent paraquat. The data presented here show that the genetic responses to superoxide stress in P. putida differ markedly from those seen in E. coli and Salmonella, and the role of P. putida soxR remains to be established.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 341, Issue 1, 3 March 2006, Pages 51–56
نویسندگان
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