QM/MM simulations of vibrational spectra of bacteriorhodopsin and channelrhodopsin-2.
QM/MM simulations of vibrational spectra of bacteriorhodopsin and channelrhodopsin-2.
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细菌视紫红质和通道视紫红质-2 振动光谱的 QM/MM 模拟
DOI:
10.1039/c3cp44181d
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
M. Elstner
中科院分区:
文献类型:
--
作者:
K. Welke;H. C. Watanabe;T. Wolter;M. Gaus;M. Elstner
Channelrhodopsin-2 is a light-gated ion channel, which has been studied intensively over the last decade. Vibrational spectroscopic experiments started to shed light on the structural changes, that occur during the photocycle, especially in the hydrogen-bonded network surrounding the protonated D156 and C128 – the DC gate. However, the interpretation of these experiments was only based on homology models. Since then, an X-ray structure and better computational models became available. In this article, we show that in combination with a recent reparametrization, the approximate DFT method, DFTB, is able to describe the effects of hydrogen bonding on the CO stretch vibration in carboxylic acids reliably and agrees well with full DFT results. We apply DFTB in a QM/MM framework to perform vibrational analysis of buried aspartic acids in bacteriorhodopsin and channelrhodopsin-2. Using this approach, we can simulate the FTIR spectral difference between D115 in the dark-adapted and K states of bacteriorhodopsin. The FTIR experiments on the DC gate in channelrhodopsin-2 are well described using an indirect model, where D156 and C128 are bridged via a water molecule.
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影响因子:
3.3
作者:
K. Welke;Jan S Frähmcke;Hiroshi C. Watanabe;P. Hegemann;M. Elstner
通讯作者:
M. Elstner
影响因子:
2.9
作者:
BRAIMAN, MS;MOGI, T;ROTHSCHILD, KJ
通讯作者:
ROTHSCHILD, KJ
影响因子:
5.7
作者:
Bondar, AN;Elstner, M;Fischer, S
通讯作者:
Fischer, S
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
A. Bondar;Jeremy C. Smith;Stefan Fischer
通讯作者:
Stefan Fischer
影响因子:
15
作者:
Radu, Ionela;Bamann, Christian;Heberle, Joachim
通讯作者:
Heberle, Joachim