期刊
JOURNAL OF COMPUTATIONAL CHEMISTRY
卷 30, 期 13, 页码 2105-2121出版社
WILEY
DOI: 10.1002/jcc.21211
关键词
amino acids; dipeptides; potential energy surface; structure determination
资金
- Knowledge Innovation Program and the Key program of the Chinese Academy of Sciences [KJCXI.YW.07]
- National Science Foundation of China [10574114]
- Innovation Funds for Graduate Students of USTC [KD2006075]
- Outstanding Doctoral Students of USTC
Conformations of peptides are the basis for their property studies and the predictions of peptide structures are highly important in life science but very complex in practice. Here. thorough searches oil the potential energy surfaces of 13 representative dipeptides by considering all possible combinations of file bond rotational degrees of freedom are performed using the density functional theory based methods. Careful analyses of the conformers of the 13 dipeptides and the corresponding amino acids reveal the connections between the structures of dipeptide and amino acids. A method for finding all important dipeptide conformers by optimizing a small number Of trial Structures generated by suitable superposition of file parent amino acid conformations is thus proposed. Applying file method to another eight dipeptides carefully examined by others shows that the new approach is both highly efficient and reliable by providing the most complete ensembles of dipeptide conformers and Much improved agreements between the theoretical and experimental IR spectra. The method opens the door for the determination of the stable Structures of all dipeptides with a manageable amount Of effort. Preliminary result oil the applicability of the method to the tripeptide structure determination is also presented. The results are the first step towards proving Antinsen's hypothesis by revealing the relationships between the Structures of the simplest peptide and its constituting amino acids. It implies that file Structures of peptides are not only determined by their amino acid sequences. but also closely linked with the amino acid conformations. (C) 2009 Wiley Periodicals, Inc. J Comput Chem 30: 2105-2121, 2009
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据