Flow Linear Dichroism of Some Prototypical Proteins

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• 作者：Benjamin M. Bulheller ; Alison Rodger ; Matthew R. Hicks ; Timothy R. Dafforn ; Louise C. Serpell ; Karen E. Marshall ; Elizabeth H. C. Bromley ; Patrick J. S. King ; Kevin J. Channon ; Derek N. Woolfson ; Jonat
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：September 23, 2009
• 年：2009
• 卷：131
• 期：37
• 页码：13305-13314
• 全文大小：415K
• 年卷期：v.131,no.37(September 23, 2009)
• ISSN：1520-5126

文摘

Flow linear dichroism (LD) spectroscopy provides information on the orientation of molecules in solution and hence on the relative orientation of parts of molecules. Long molecules such as fibrous proteins can be aligned in Couette flow cells and characterized using LD. We have measured using Couette flow and calculated from first principles the LD of proteins representing prototypical secondary structure classes: a self-assembling fiber and tropomyosin (all-α-helical), FtsZ (an αβ protein), an amyloid fibril (β-sheet), and collagen [poly(proline)II helices]. The combination of calculation and experiment allows elucidation of the protein orientation in the Couette flow and the orientation of chromophores within the protein fibers.