Structural heterogeneity of pyrimidine/purine-biased DNA sequence analyzed by atomic force microscopy.

Structural heterogeneity of pyrimidine/purine-biased DNA sequence analyzed by atomic force microscopy.
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通过原子力显微镜分析嘧啶/嘌呤偏向 DNA 序列的结构异质性。

DOI:
10.1046/j.1432-1033.2002.03063.x
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发表时间:
2002
期刊:
European journal of biochemistry
影响因子:
--
通讯作者:
Lyubchenko,YuriL
Lyubchenko,YuriL
中科院分区:
--
文献类型:
--
作者:
Kato,Mikio;McAllister,ChadJ;Hokabe,Shingo;Shimizu,Nobuyoshi;Lyubchenko,YuriL

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我们在这里报告了在称为 pTIR10 的质粒 DNA 中形成替代 DNA 结构的直接证据,该质粒包含从大鼠基因组中分离出的 0.23 kb 嘧啶/嘌呤偏向 (Pyr/Pur) 片段。长Pyr/Pur序列在真核基因组中丰富,它们可以通过形成各种类型的三链体相关结构来调节基因和基因组的生物活性。将乙酸钠缓冲液(pH 4.35)中的质粒DNA沉积在APS修饰的云母上,干燥后在空气中用原子力显微镜成像。在 pTIR10 DNA 上观察到各种类型的粗突起。 DNA 分子的结构参数(宽度和高度)表明,此处观察到的替代结构是分子内三链体主题的变化。讨论了 Pyr/Pur 延伸段内结构特征的生物学相关性。
We report here the direct evidence for the formation of alternative DNA structures in a plasmid DNA, termed pTIR10, containing a 0.23‐kb pyrimidine/purine‐biased (Pyr/Pur) stretch isolated from the rat genome. Long Pyr/Pur sequences are abundant in eukaryotic genomes, and they may modulate the biological activity of genes and genomes via formation of various types of triplex‐related structures. The plasmid DNA in sodium acetate buffer (pH 4.35) was deposited on APS‐modified mica, and after drying it was imaged with an atomic force microscope in air. Various types of thick protrusions have been observed on pTIR10 DNA. Structural parameters (width and height) of DNA molecules suggest that the alternative structures observed here are variations on the theme of an intramolecular triplex. The biological relevance of the structural features within Pyr/Pur stretches is discussed.
质粒中多聚嘌呤、多聚嘧啶序列的多种非 B-DNA 构象。
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