Chromatin structure of the potential Z-forming sequence (dT-dG)n X (dC-dA)n. Evidence for an "alternating-B" conformation.

Chromatin structure of the potential Z-forming sequence (dT-dG)n X (dC-dA)n. Evidence for an "alternating-B" conformation.
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潜在 Z 形成序列 (dT-dG)n X (dC-dA)n 的染色质结构。

DOI:
10.1016/0022-2836(85)90218-9
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发表时间:
1985
影响因子:
5.6
通讯作者:
Garrard,WT
Garrard,WT
中科院分区:
生物学2区
文献类型:
--
作者:
Gross,DS;Huang,SY;Garrard,WT

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(dT-dG)n·(dC-dA)是真核生物基因组中最丰富的嘌呤-嘧啶二核苷酸重复序列。这个序列和某些其他含有交替嘌呤-嘧啶残基的序列在体外被证明在负扭转应力或离子强度升高时采用左手的Z-DNA构象。我们通过观察培养的小鼠细胞核中的(dT-dG)n·(dC-dA)片段的染色质结构,来探讨这些片段是否存在于体内的拓扑限制的Z型结构中。我们发现,这些元素被定量包装成典型的核心颗粒嵌入在典型的多核小体阵列。此外,这些序列既不位于优先对S1核酸酶敏感的染色质区域的侧翼,也不位于该区域内。这些特征表明,这些纤维束并不主要存在于Z-染色体体内。此外,采用的技术,允许显着杂交的DNA片段短至18个碱基,我们提供的证据表明,在体内,大多数(dT-dG)n·(dC-dA)n元素,而不是采取“交替-B”的核小体表面的构象。
The sequence (dT-dG)n· (dC-dA)nis the most abundant purine-pyrimidine dinucleotide repeat in eukaryotic genomes. This sequence and certain others that contain alternating purine-pyrimidine residues have been shown to adopt the left-handed,Z-DNA conformationin vitrowhen subjected to negative torsional stress or elevated ionic strengths. We have asked whether (dT-dG)n· (dC-dA)ntracts exist in topologically constrainedZ-form structuresin vivoby examining the chromatin organization of these sequences in cultured mouse cell nuclei. We find that these elements are quantitatively packaged into typical core particles which are embedded in canonical polynucleosomal arrays. In addition, these sequences neither flank nor reside within regions of chromatin that are preferentially sensitive to S1nuclease. These characteristics suggest that these tracts do not exist predominantly in theZ-formin vivo. Furthermore, employing techniques that permit prominent hybridization to DNA fragments as short as 18 bases, we provide evidence thatin vivo, most (dT-dG)n· (dC-dA)nelements instead adopt an “alternating-B” conformation on the nucleosomal surface.
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发表时间: 1981-01-01
影响因子: 5.6
作者:
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