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多尺度动力学模拟揭示偶氮苯光异构化引发的多肽折叠与解折叠的分子机理
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摘要
偶氮苯通过光异构化可以控制多肽的折叠和解折叠过程,并进一步调节多肽的性质以及酶的活性~([1-3])。但是,其微观机制目前尚不是非常清楚。我们采用量子力学和分子力学(QM/MM)相结合的方法以及经典的分子力学(MM)方法,研究了偶氮苯和FK-11多肽之间光诱导的折叠和解折叠过程的分子动力学模拟。研究表明,光诱导的偶氮苯可以加速FK-11多肽的折叠和解折叠过程~([4])。多肽和偶氮苯之间的相互作用对多肽二级结构的变化也起到很重要的作用。这种相互作用同样改变了交联剂偶氮苯的光异构化机理。我们预计这种方法还可以用于研究其他的多肽,蛋白质和生物材料的光诱导的一些性质。
Photoswitchable azobenzene cross-linkers can control the folding and unfolding of peptides by photoisomerization and can regulate peptide affinities and enzyme activities~([1-3]). However, a detailed mechanistic understanding of these processes at the atomistic level is still lacking. Using quantum mechanics/molecular mechanics(QM/MM) methods and classical MM force fields, we report the first molecular dynamics simulations of the photoinduced folding and unfolding processes in the FK-11 peptide. We show that the cross-linking of a photoswitchable azobenzene can accelerate the folding and unfolding events in the FK-11 peptide~([4]). We also find that the interactions between the peptide and the azobenzene cross-linker are crucial for controlling the evolution of the secondary structure of the peptide. The interactions also modify the photoisomerization mechanism of the azobenzene cross-linker compared with the situation in vacuo or in solution. We anticipate that this approach can also be applied to investigate photocontrol phenomena in other peptides, proteins, and biomaterials.
引文
[1]Beharry,A.;Woolley,G.Chem.Soc.Rev.2011,40:4422.
    [2]Dhammika Bandara,H.;Burdette,S.Chem.Soc.Rev.2012,41:1809.
    [3]Korbus,M.;Balasubramanian,G.;Müller-Plathe,F.;Kolmar,H.;Meyer-Almes,F.-J.Biol.Chem.2014,395:401.
    [4]Xia,S.-H.;Cui,G.L.;Fang,W.-H.;Thiel.W.Angew.Chem.Int.Ed.2016,128:2107.

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