Reproducibility and transferability of topological data:: experimental charge density study of two modifications of L-alanyl-L-tyrosyl-L-alanine

被引:43
作者
Checinska, Lilianna
Mebs, Stefan
Huebschle, Christian B.
Foerster, Diana
Morgenroth, Wolfgang
Luger, Peter
机构
[1] Free Univ Berlin, Inst Chem & Biochem Crystallog, D-14195 Berlin, Germany
[2] Univ Lodz, Dept Crystallog & Crystal Chem, PL-90236 Lodz, Poland
[3] Aarhus Univ, Dept Chem, DK-8000 Aarhus C, Denmark
[4] Univ Gottingen, Inst Inorgan Chem, D-37077 Gottingen, Germany
[5] DESY, HASYLAB, D-22603 Hamburg, Germany
关键词
D O I
10.1039/b607744g
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Two crystalline modi. cations of the tripeptide L-Ala -L-Tyr-L-Ala, which have different solvent molecules in the crystal structure ( water and ethanol for modi. cations 1 and 2), were the subject of experimental charge density studies based on high resolution X-ray data collected at ultra-low temperatures of 9 K ( 1) and 20 K ( 2), respectively. The molecular structures and the intermolecular interactions were found to be rather similar in the two crystal lattices, so that this study allowed the reproducibility of the charge density of a given molecule in different ( but widely comparable) crystalline environments to be examined. With respect to bond topological and atomic properties, the agreement between the two modi. cations of the title tripeptide was in the same range as found from the comparison with the previously reported results of tri-L-alanine. It follows that the reproducibility and transferability of quantitative topological data are comparable and that within the accuracy of experimental charge density work the replacement of the central amino acid residue L-Ala by L-Tyr has no significant influence, neither on bond nor on the atomic properties of the oligopeptide main chain. Intermolecular interactions in the form of hydrogen bonds were characterized quantitatively and qualitatively by topological criteria and by mapping the charge density distribution on the Hirshfeld surface.
引用
收藏
页码:3242 / 3251
页数:10
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