Solution structures of beta peptides from Raman optical activity.
Solution structures of beta peptides from Raman optical activity.
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来自拉曼光学活性的 β 肽的溶液结构。
DOI:
10.1002/anie.200801111
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发表时间:
2008
期刊:
影响因子:
--
通讯作者:
Kapitán J
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文献类型:
--
作者:
Kapitán J
There is much current interest in the synthesis and characterization of compounds, which form chiral helical and other secondary structures as key building blocks of supramolecular and functional nanosystems.[1–3] Some of the work in this field is inspired by—and attempts to mimic—the homochirality and function of biological macromolecules, exemplified by the recent discovery of a β-dodecapeptide folding into a helix that aggregates to an octameric complex, just like a true protein forming a quaternary structure.[4] β-Peptides consisting of homologated proteinogenic α-amino acids contain an additional CH2 group in each and every residue. They can adopt stable helices in methanol or water and can interact with cellular proteins and membranes.[5] However, as with their natural counterparts, determination of the solution structures of the associated oligomers and polymers, unfolded or folded, remains a key problem. 2D NMR spectroscopy is the method of choice, so far, but is not always applicable and can be cumbersome when several interconverting conformers are present. The NMR method provides structures averaged over ca. 10À6 s, a very long time scale as compared to that of rotations, vibrations, and electronic excitations. Studies of βpeptides using circular dichroism suggested that this conventional chiroptical UV/Vis technique is unable to provide reliable information about their conformational preferences.[6] Here we report a promising study of this problem using the chiroptical technique of vibrational Raman optical activity (ROA).[7, 8]We studied the three β-peptides A, B, and C. Their backscattered Raman and ROA spectra in methanol solution are displayed in Figure 1a–c and that of C in water as Figure 1d. From the average Δ values, it is apparent that A generates much stronger ROA signals than B and C. From a 2D NMR
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DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
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影响因子:
2.9
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DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
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通讯作者:
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