کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9886463 | 1537826 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mobilization of arachidonyl moieties from triacylglycerols into chloroplastic lipids following recovery from nitrogen starvation of the microalga Parietochloris incisa
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کلمات کلیدی
monogalactosyldiacylglycerolTAGDGTSFFAEPAMGDGdigalactosyldiacylglycerolDGDGArachidonic acid - اسید آراشیدونیکEicosapentaenoic acid - اسید ایکوزاپنتانوئیکPolyunsaturated fatty acid - اسید چرب غیر اشباعPUFA - اسید چرب چند غیراشباعFree fatty acids - اسیدهای چرب آِزادTriacylglycerols - ترشیال گلیسیرینtriacylglycerol - تری آسیل گلیسرول diacylglycerols - دی سیل گلیسیرینDAG - روزMicroalgae - ریز جلبک هاphosphatidylcholine - فسفاتیدیل کولینphosphatidylethanolamine - فسفاتیدیلتانولامین
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Mobilization of arachidonyl moieties from triacylglycerols into chloroplastic lipids following recovery from nitrogen starvation of the microalga Parietochloris incisa Mobilization of arachidonyl moieties from triacylglycerols into chloroplastic lipids following recovery from nitrogen starvation of the microalga Parietochloris incisa](/preview/png/9886463.png)
چکیده انگلیسی
The microalga Parietochloris incisa (Trebouxiophyceae, Chlorophyta) was isolated from an alpine environment. It was found to accumulate unusually high amounts of arachidonic acid (AA)-rich TAG. We have hypothesized that microalgal PUFA-rich TAG might have a role as a depot of PUFA, which could be mobilized for the construction of chloroplastic membranes under sudden changes in environmental conditions. We have thus studied the changes in lipid and fatty acid composition during recovery from nitrogen starvation at 24 and 12 °C. At both temperatures, TAG was mainly consumed to support growth, however, there was a significant increase in the content of AA in the chloroplastic lipids, predominantly, monogalactosyldiacylglycerol (MGDG) at 24 °C, but much less so at 12 °C. Similar results were obtained using radiolabeled precursors. These and other findings point to the existence of three modes of operation for the construction of chloroplastic lipids that the alga can utilize to support growth under changing environmental conditions. When environmental conditions do not support growth, the prokaryotic pathway predominates. When sudden changes occur, the eukaryotic pathway is enhanced and can be even further augmented by influx of acyl moieties from TAG to maximize the exploitation of growth conditions that may possibly be transitory.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids - Volume 1738, Issues 1â3, 30 December 2005, Pages 63-71
Journal: Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids - Volume 1738, Issues 1â3, 30 December 2005, Pages 63-71
نویسندگان
Inna Khozin-Goldberg, Pushkar Shrestha, Zvi Cohen,