کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5907666 | 1160132 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Transcription of the Listeria monocytogenes fri gene is growth-phase dependent and is repressed directly by Fur, the ferric uptake regulator
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کلمات کلیدی
BHIEDDHAIPTGDTTqRT-PCRHRPDPSBSA - BSAelectrophoretic mobility shift assays - آزمایشات تحرک تحرک الکتروفورزbovine serum albumin - آلبومین سرم گاوisopropyl-β-thiogalactopyranoside - ایزوپروپیل-بتا-تیوگالاکوپیرانوزیدmRNA expression - بیان mRNAbrain heart infusion - تزریق قلب مغزیdithiothreitol - دیتیوتریتولquantitative real-time reverse transcription-polymerase chain reaction - زمان واقعی واکنش زنجیره ای رونویسی معکوس و پلیمریزا معکوس کمیEMSA یا electrophoretic mobility shift assay - سنجش تغییر تحرک الکتروفورتیکIron regulation - مقررات آهنNucleotide - نوکلئوتیدHorseradish peroxidase - پراکسیداز هوررادیش
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
ژنتیک
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چکیده انگلیسی
The Listeria monocytogenes fri gene encodes the only ferritin-like protein of this pathogen, a Dps protein (DNA binding protein from starved cells). Listeria Dps is endowed with the capacity to detoxify concurrently free iron and H2O2, is essential for virulence and is required for efficient bacterial growth at early stages of the infection process. The transcription of fri is known to depend on ÏA and ÏB factors, to be affected by growth conditions and to be derepressed in a perR (peroxide-inducible stress response regulator) mutant background. The present work shows that fri transcription is restricted to the exponential phase of growth, whereas the Dps protein has a long half-life and is detected in significant amounts also in stationary phase cells. Expression of fri is downregulated under iron-rich conditions and is controlled directly by Fur, the ferric uptake regulator, which binds within the DNA region encompassing nucleotides from position â 23 to position + 90 relative to the proximal ÏA transcription startpoint. The putative Fur-box is proposed to coincide with the putative Per-box both in sequence and position. The primary structure of L. monocytogenes Fur has a high degree of similarity with homologues of known X-ray crystal structure. The molecular model of L. monocytogenes Fur built on this basis shows that the ligands of the structural Zn(II) and of the regulatory Fe(II) are conserved and are located in positions fully compatible with their respective roles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Gene - Volume 410, Issue 1, 29 February 2008, Pages 113-121
Journal: Gene - Volume 410, Issue 1, 29 February 2008, Pages 113-121
نویسندگان
Francesca Fiorini, Simonetta Stefanini, Piera Valenti, Emilia Chiancone, Daniela De Biase,