کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8301334 | 1537677 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Regulation of yeast fatty acid desaturase in response to iron deficiency
ترجمه فارسی عنوان
مقررات اسید چرب امگا 3 در پاسخ به کمبود آهن
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کلمات کلیدی
SFAOLE1MGA2UFABPSRT-qPCRFASFatty acid - اسید چربsaturated fatty acid - اسید چرب اشباع شدهunsaturated fatty acid - اسید چرب غیر اشباعFatty acids - اسیدهای چربchromatin immunoprecipitation - ایمن سازی کروماتینSaccharomyces cerevisiae - ساکارومایسس سرویزیهCold - سردFerrous ammonium sulfate - سولفات آمونیوم آهنendoplasmic reticulum - شبکه آندوپلاسمی transmembrane - فرابنفشYeast - مخمرTranscription rate - نرخ رونویسیHypoxia - هیپوکسیPol II - پل دومpolymerase II - پلیمراز IIoptical density - چگالی نوریCHiP - چیپIron deficiency - کمبود آهن
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
چکیده انگلیسی
Unsaturated fatty acids (UFA) are essential components of phospholipids that greatly contribute to the biophysical properties of cellular membranes. Biosynthesis of UFAs relies on a conserved family of iron-dependent fatty acid desaturases, whose representative in the model yeast Saccharomyces cerevisiae is Ole1. OLE1 expression is tightly regulated to adapt UFA biosynthesis and lipid bilayer properties to changes in temperature, and in UFA or oxygen availability. Despite iron deficiency being the most extended nutritional disorder worldwide, very little is known about the mechanisms and the biological relevance of fatty acid desaturases regulation in response to iron starvation. In this report, we show that endoplasmic reticulum-anchored transcription factor Mga2 activates OLE1 transcription in response to nutritional and genetic iron deficiencies. Cells lacking MGA2 display low UFA levels and do not grow under iron-limited conditions, unless UFAs are supplemented or OLE1 is overexpressed. The proteasome, E3 ubiquitin ligase Rsp5 and the Cdc48Npl4/Ufd1 complex are required for OLE1 activation during iron depletion. Interestingly, Mga2 also activates the transcription of its own mRNA in response to iron deficiency, hypoxia, low temperature and low UFAs. MGA2 up-regulation contributes to increase OLE1 expression in these situations. These results reveal the mechanism of OLE1 regulation when iron is scarce and identify the MGA2 auto-regulation as a potential activation strategy in multiple stresses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids - Volume 1863, Issue 6, June 2018, Pages 657-668
Journal: Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids - Volume 1863, Issue 6, June 2018, Pages 657-668
نویسندگان
Antonia MarÃa Romero, Tania Jordá, Nicolas Rozès, MarÃa Teresa MartÃnez-Pastor, Sergi Puig,