Theoretical study on spectral differences of polypeptides constituted by L- and D-amino acids

Theoretical study on spectral differences of polypeptides constituted by L- and D-amino acids
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L-和D-氨基酸构成的多肽光谱差异的理论研究

DOI:
10.1080/00268976.2020.1812747
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发表时间:
2020-08
期刊:
影响因子:
1.7
通讯作者:
Liu Yan-Ying
Liu Yan-Ying
中科院分区:
化学4区
文献类型:
--
作者:
Zheng Ren-Hui;Wei Wen-Mei;Liu Yan-Ying

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氨基酸、多肽和蛋白质都是手性的,是最重要的生物物质。大多数生物体都是由l -氨基酸组成的。手性在探索生物分子中具有重要意义。研究含有大量原子的多肽是量子化学计算的一大挑战。我们对两种由14个L-和d -氨基酸组成的多肽进行了结构研究,并进行了振动和电子光谱研究,这两种多肽都是右手性α-螺旋状的。我们发现,除了d -氨基酸构成的多肽具有分子内氢键峰外,两种多肽具有相似的红外和拉曼振动光谱,但它们的手性和激发态光谱不同,并且手性光谱不是镜像对称的,这可以用来区分它们,说明它们在细节上具有不同的结构。因此,它们可能具有不同的性质和功能。此外,多肽的酰胺III振动还包含主链和侧链的信息。因此,应注意应用酰胺III振动来确定多肽的二级结构。图形抽象
Amino acids, polypeptides and proteins, which are all chiral, are the most important living substances. Most living organisms are made up of L-amino acids. Chirality is of great significance in exploring biomolecules. Studying polypeptides with a large number of atoms is a great challenge for quantum chemistry calculation. We conduct structural studies and perform vibrational and electronic spectra investigations on two polypeptides consisting of 14 L- and D-amino acids, both of which are right-handed α-helical. We find that the two polypeptides have similar IR and Raman vibrational spectra except that the polypeptide constituted by D-amino acids has an intramolecular hydrogen bond peak, but their chiral and excited state spectra are different and the chiral spectra are not mirror symmetric, which can be applied to distinguish them and shows that they have different structures in detail. Thus they may have different properties and functions. In addition, the amide III vibrations of the polypeptide include the information of the backbone and side chains. Therefore, care should be taken to apply the amide III vibrations to determine the secondary structure of polypeptide. GRAPHICAL ABSTRACT
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