کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8360324 1542334 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Expression, purification and reconstitution of the C-terminal transmembrane domain of scavenger receptor BI into detergent micelles for NMR analysis
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Expression, purification and reconstitution of the C-terminal transmembrane domain of scavenger receptor BI into detergent micelles for NMR analysis
چکیده انگلیسی
Scavenger receptor class B type I (SR-BI), the high density lipoprotein (HDL) receptor, is important for the delivery of HDL-cholesteryl esters to the liver for excretion via bile formation. The focus on therapeutic strategies aimed at reducing cholesterol levels highlights the critical need to understand the structural features of SR-BI that drive cholesterol removal. Yet, in the absence of a high-resolution structure of SR-BI, our understanding of how SR-BI interacts with HDL is limited. In this study, we have optimized the NMR solution conditions for the structural analysis of the C-terminal transmembrane domain of SR-BI that harbors putative domains required for receptor oligomerization. An isotopically-labeled SR-BI peptide encompassing residues 405-475 was bacterially-expressed and purified. [U-15N]-SR-BI(405-475) was incorporated into different detergent micelles and assessed by 1H-15N-HSQC in order to determine which detergent micelle best maintained SR-BI(405-475) in a folded, native conformation for subsequent NMR analyses. We also determined the optimal detergent concentration used in micelles, as well as temperature, solution buffer and pH conditions. Based on 1H-15N-HSQC peak dispersion, intensity, and uniformity, we determined that [U-15N]-SR-BI(405-475) should be incorporated into 5% detergent micelles consisting of 1-palmitoyl-2-hydroxy-sn-glycero-3-phospho-[1′-rac-glycerol] (LPPG) and data collected at 40 °C in a non-buffered solution at pH 6.8. Furthermore, we demonstrate the ability of SR-BI(405-475) to form dimers upon chemical crosslinking. These studies represent the first steps in obtaining high-resolution structural information by NMR for the HDL receptor that plays a critical role in regulating whole body cholesterol removal.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Protein Expression and Purification - Volume 107, March 2015, Pages 35-42
نویسندگان
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