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绿色荧光蛋白发色团激发态动力学的理论模拟
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摘要
最近,实验上通过化学修饰新合成了邻羟基绿色荧光蛋白发色团(o-LHBDI),具有显著的荧光发光效应~([1])。然而其荧光增强的机理并不清楚,在本工作中,我们采用高精度的静态电子结构计算(MS-CASPT2,CASSCF)结合半经验非绝热动力学模拟(OM2/MRCI)详细探究了o-LHBDI的光化学与光物理过程~([2,3]),并与另外两种广泛研究的GFP发色团的光化学与光物理过程进行了比较。计算结果表明,光诱导的激发态质子转移及化学修饰对GFP发色团的荧光强度具有重要的影响。两者的协同作用导致了GFP发色团迥异的激发态动力学行为。本研究为设计更好的荧光蛋白发色团提供了理论依据。
In contrast to the high fluorescent quantum yield of green fluorescent protein(GFP), its core chromophore,4-(4-hydroxybenzylidene)-1,2-dimethyl-1H-imidazol-5(4H)-one(p-HBDI), is neither emissive in neutral or anion form in solution. A newly synthesized analogue of p-HBDI, denoted as o-LHBDI, rendering a high tautomer emission yield~([1]). However, the underlying mechanism remains unclear. In this study, we have carefully investigated the photodynamics of o-LHBI, a model system of o-LHBDI, in a way that employing both high levels of static electronic calculations(CASSCF//CASPT2) and semi-empirical non-adiabatic dynamic simulations(OM2/MRCI)~([2-3]).The important role played by the intramolecular hydrogen bond and the locked structure were discussed in detail. The possibility of the designation of new ESIPT-based OLED materials was also suggested.
引文
[1]Hsu,Y.-H.;Chen,Y.-A.;Tseng,H.-W.;Zhang,Z.;Shen,J.-Y.;Chuang,W.-T.;Lin,T.-C.;Lee,C.-S.;Hung,W.-Y.;Hong,B.-C.;Liu,S.-H.;Chou,P.-T.J.Am.Chem.Soc.2014,136:11805.
    [2]Cui,G.;Lan,Z.;Thiel,W.J.Am.Chem.Soc.2012,134:1662.
    [3]Liu,X.-Y.;Chang,X.-P.;Xia,S.-H.;Cui,G.;Thiel.W.J.Chem.Theory Comput 2016,12:753.

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