کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9885137 | 1537153 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Protein mediated glycolipid transfer is inhibited FROM sphingomyelin membranes but enhanced TO sphingomyelin containing raft like membranes
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کلمات کلیدی
PoPCGLTPglycosphingolipidGalCerGSLSPMDPPCGlycolipid transfer proteinsphingomyelin - اسفنگومیلینresonance energy transfer - انتقال انرژی رزونانسRET - حقphosphatidylcholine - فسفاتیدیل کولینFluorescence - فلورسنسSUV - ماشین شاسی بلندcholesterol - کلسترولSmall unilamellar vesicle - کوچک کیسه بیضهgalactosylceramide - گالاکتوسیلسرامیدLipid rafts - گستره چربی، کلک چربی یا لیپید رفتGlycosphingolipids - گلیسفینگولایپید ها
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The mammalian glycolipid transfer protein, GLTP, catalyzes the transfer in vitro of glycolipids between membranes. In this study we have examined on one hand the effect of the variations in the donor vesicle composition and on the other hand the effects of variations in the acceptor vesicle composition on the GLTP-catalyzed transfer kinetics of galactosylceramide between bilayer vesicles. For this purpose a resonance energy transfer assay was used, the energy donor being anthrylvinyl-galactosylceramide and the energy acceptor DiO-C16. First, we show that the transfer of anthrylvinyl-galactosylceramide from palmitoyl-oleoyl-phosphatidylcholine donor vesicles was faster than from dipalmitoyl-phosphatidylcholine vesicles, and that there is no transfer from palmitoyl-sphingomyelin vesicles regardless of the cholesterol amount. In this setup the acceptor vesicles were always 100% palmitoyl-oleoyl-phosphatidylcholine. We also showed that the transfer in general is faster from small highly curved vesicles compared to that from larger vesicles. Secondly, by varying the acceptor vesicle composition we showed that the transfer is faster to mixtures of sphingomyelin and cholesterol compared to mixtures of phosphatidylcholines and cholesterol. Based on these experiments we conclude that the GLTP mediated transfer of anthrylvinyl-galactosylceramide is sensitive to the matrix lipid composition and membrane bending. We postulate that a tightly packed membrane environment is most effective in preventing GLTP from accessing its substrates, and cholesterol is not required to protect the glycosphingolipid in the membrane from being transferred by GLTP. On the other hand GLTP can more easily transfer glycolipids to 'lipid raft' like membranes, suggesting that the protein could be involved in raft assembly.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Biomembranes - Volume 1669, Issue 2, 20 May 2005, Pages 87-94
Journal: Biochimica et Biophysica Acta (BBA) - Biomembranes - Volume 1669, Issue 2, 20 May 2005, Pages 87-94
نویسندگان
Matts Nylund, Peter Mattjus,