Exploring the Molecular Conformation Space by Soft Molecule-Surface Collision.

Exploring the Molecular Conformation Space by Soft Molecule-Surface Collision.
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DOI:
10.1021/jacs.0c09933
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发表时间:
2020-12-23
影响因子:
15
通讯作者:
Kern K
Kern K
中科院分区:
化学1区
文献类型:
--
作者:
Anggara K;Zhu Y;Delbianco M;Rauschenbach S;Abb S;Seeberger PH;Kern K

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生物分子通过采用多种构象发挥作用。这种动力学受到构象景观的控制,构象景观的研究需要对基态和激发构象态进行表征。在这里,通过使用软分子表面碰撞(0.5-5.0 eV)将初始气相分子构象异构体激发成不同的构象状态,对分子的构象景观进行采样。由此产生的地面和激发的分子构象,吸附在表面上,在单分子水平上成像。该技术允许探索寡糖构象,但迄今为止,受到寡糖和整体平均分析方法的高度灵活性的限制。作为纤维素的模型,观察到纤维六糖链有两种构象极端,即典型的“延伸”链和非典型的“卷曲”链——后者被确定为保留在表面上的气相构象异构体。观察这两个极端之间的构象揭示了纤维六糖的物理特性,其表现为刚性带,在扭曲时变得柔韧。现在可以探索任何可以电喷雾的分子的构象空间。
Biomolecules function by adopting multiple conformations. Such dynamics are governed by the conformation landscape whose study requires characterization of the ground and excited conformation states. Here, the conformational landscape of a molecule is sampled by exciting an initial gas-phase molecular conformer into diverse conformation states, using soft molecule–surface collision (0.5–5.0 eV). The resulting ground and excited molecular conformations, adsorbed on the surface, are imaged at the single-molecule level. This technique permits the exploration of oligosaccharide conformations, until now, limited by the high flexibility of oligosaccharides and ensemble-averaged analytical methods. As a model for cellulose, cellohexaose chains are observed in two conformational extremes, the typical “extended” chain and the atypical “coiled” chain—the latter identified as the gas-phase conformer preserved on the surface. Observing conformations between these two extremes reveals the physical properties of cellohexaose, behaving as a rigid ribbon that becomes flexible when twisted. The conformation space of any molecule that can be electrosprayed can now be explored.
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