Coherent two dimensional infrared spectroscopy of a cyclic decapeptide antamanide. A simulation study of the amide-I and A bands.

Coherent two dimensional infrared spectroscopy of a cyclic decapeptide antamanide. A simulation study of the amide-I and A bands.
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DOI:
10.1021/jp801493y
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发表时间:
2008-10-02
影响因子:
3.3
通讯作者:
Mukamel, Shaul
Mukamel, Shaul
中科院分区:
化学3区
文献类型:
--
作者:
Falvo, Cyril;Hayashi, Tomoyuki;Zhuang, Wei;Mukamel, Shaul

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采用显式溶剂分子动力学模拟结合有效振动哈密顿量的密度泛函方法,计算了安他酰胺(-1Val-2Pro-3 Pro-4Ala-5 Phe-6Phe-7 Pro-8 Pro-9 Phe-10 Pro-)在氯仿中的二维红外光子回波谱.强的分子内氢键网络的证据被发现。与实验吸收的比较,可以确定占主导地位的构象。多维光谱揭示了分子内的耦合,并给出了它的动力学信息。根据局域结构预测和分析了酰胺-I和酰胺-A的双色交叉峰。
The two dimensional infrared photon echo spectrum of Antamanide (-1Val-2Pro-3Pro-4Ala-5Phe-6Phe-7Pro-8Pro-9Phe-10Pro-) in chloroform is calculated using an explicit solvent MD simulation combined with a DFT map for the effective vibrational Hamiltonian. Evidence for a strong intramolecular hydrogen bonding network is found. Comparison with experimental absorption allows to identify the dominant conformation. Multidimensional spectroscopy reveals intramolecular couplings and gives information on its dynamics. A two color amide-I and amide-A cross peak is predicted and analyzed in term of local structure.
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