SELF-ASSEMBLY OF A DOUBLE-HELICAL COMPLEX OF SODIUM

被引:101
作者
BELL, TW
JOUSSELIN, H
机构
[1] Department of Chemistry, State University of New York, Stony Brook
关键词
D O I
10.1038/367441a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
SPONTANEOUS self-organization of helical and multiple-helical molecular structures occurs on several levels in living organisms. Key examples are alpha-helical polypeptides, double-helical nucleic acids and helical protein structures, including F-actin, microtubules and the protein sheath of the tobacco mosaic virus1. Although the self-assembly of double-helical transition-metal complexes1-15 bears some resemblance to the molecular organization of double-stranded DNA, selection between monohelical, double-helical and triple-helical structures is determined largely by the size and geometrical preference of the tightly bound metal14. Here we present an example of double-helical assembly induced by the weaker and non-directional interactions of an alkali-metal ion with an organic ligand that is pre-organized into a coil. We have characterized the resulting complex by two-dimensional NMR and fast-atom-bombardment mass spectrometry. These results provide a step toward the creation of molecular tubes or ion channels consisting of intertwined coils.
引用
收藏
页码:441 / 444
页数:4
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