首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >3′:5′-Cyclic nucleotides: two sodium salts of cdTMP
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3′:5′-Cyclic nucleotides: two sodium salts of cdTMP

机译:3':5'-环状核苷酸:cdTMP的两种钠盐

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3′:5′-Cyclic nucleotides play an outstanding role in signal transduction at the cellular level but, in spite of comprehensive knowledge of the biological role of cyclic nucleotides, their structures are not established fully. Two hydrated sodium salts of thymidine 3′:5′-cyclic phosphate (cdTMP, C10H12N2O7P), namely sodium thymidine 3′:5′-cyclic phosphate heptahydrate, Na+·C10H12N2O7P?·7H2O or Na(cdTMP)·7H2O, (I), and sodium thymidine 3′:5′-cyclic phosphate 3.7-hydrate, Na+·C10H12N2O7P?·3.7H2O or Na(cdTMP)·3.7H2O, (II), have been obtained in crystalline form and structurally characterized, revealing one nucleotide in the asymmetric unit of (I) and eight different nucleotides in (II). All the cyclic nucleotide anions adopt a similar conformation with regard to nucleobase orientation, sugar conformation and 1,3,2-dioxaphosphorinane ring puckering. In (I), no direct inter-nucleotide hydrogen bonds are present, and adjacent nucleotide anions interact via water-mediated and Na+-mediated contacts. In contrast, in (II), direct thymine–phosphate N—H...O inter-nucleotide hydrogen bonds occur and these are assisted by numerous inter-nucleotide C—H...O contacts, giving rise to the self-assembly of cdTMP? anions into three different ribbons. Two of these three ribbons run in the same direction, while the third is antiparallel.
机译:3':5'-环核苷酸在细胞水平上在信号转导中起着重要作用,但是,尽管对环核苷酸的生物学作用有全面的了解,但它们的结构尚未完全建立。胸苷3':5'-环状磷酸盐的两种水合钠盐(cdTMP,C10H12N2O7P),胸苷3':5'-环状磷酸盐七水合物,Na +·C10H12N2O7Pα·7H2O或Na(cdTMP)·7H2O,(I) ,和胸苷钠3':5'-环状磷酸3.7水合物Na +·C10H12N2O7Pα·3.7H2O或Na(cdTMP)·3.7H2O(II),已获得结晶形式并进行了结构表征,揭示了其中的一个核苷酸(I)的不对称单元和(II)中的八个不同核苷酸。所有环状核苷酸阴离子在核碱基方向,糖构型和1,3,2-二氧杂磷杂环丁烷环折叠方面都采用相似的构型。在(I)中,不存在直接的核苷酸间氢键,并且相邻的核苷酸阴离子通过水介导的和Na +介导的接触相互作用。相比之下,在(II)中,胸腺嘧啶-磷酸N-H ... O直接发生核苷酸间氢键,这些键由许多核苷酸间C-H ... O接触辅助,从而导致自组装的cdTMP?阴离子分成三个不同的功能区。这三个功能区中的两个功能区沿相同方向延伸,而第三个功能区是反平行的。

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