Evidence for DNA Translocation by the ISWI Chromatin-Remodeling Enzyme

Evidence for DNA Translocation by the ISWI Chromatin-Remodeling Enzyme
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ISWI 染色质重塑酶 DNA 易位的证据

DOI:
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发表时间:
2003
影响因子:
5.3
通讯作者:
T. Owen
T. Owen
中科院分区:
生物学2区
文献类型:
--
作者:
I. Whitehouse;Chris Stockdale;A. Flaus;M. Szczelkun;T. Owen

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摘要ISWI蛋白形成了一系列依赖于ATP的染色质重塑活性的催化核心。在这里,我们研究了ISWI蛋白与核小体底物的相互作用。我们发现,核酸结合和刺激ISWI的ATPase活性的能力依赖于长度。我们还发现,当ISWI被引入到核小体附近的位置时,它们能够有效地取代形成三链的寡核苷酸,但距离其边缘30到60个碱基对的效率依次降低。在三链和核小体之间的3‘-5’链上引入5或10个碱基的间隙,特别阻碍了ISWI直接三链置换的能力。综上所述,这些观察结果表明,ISWI是一种3‘-5’-链特异的、依赖于ATP的DNA易位酶,它可能能够迫使DNA通过核小体表面。
ABSTRACT The ISWI proteins form the catalytic core of a subset of ATP-dependent chromatin-remodeling activities. Here, we studied the interaction of the ISWI protein with nucleosomal substrates. We found that the ability of nucleic acids to bind and stimulate the ATPase activity of ISWI depends on length. We also found that ISWI is able to displace triplex-forming oligonucleotides efficiently when they are introduced at sites close to a nucleosome but successively less efficiently 30 to 60 bp from its edge. The ability of ISWI to direct triplex displacement was specifically impeded by the introduction of 5- or 10-bp gaps in the 3′-5′ strand between the triplex and the nucleosome. In combination, these observations suggest that ISWI is a 3′-5′-strand-specific, ATP-dependent DNA translocase that may be capable of forcing DNA over the surface of nucleosomes.
通过 DNA 解旋酶有效解旋三链体 DNA。
DOI: 10.1006/bbrc.1994.2578
发表时间: 1994
影响因子: 3.1
作者:
Maine,IP;Kodadek,T
通讯作者: Kodadek,T
DOI: 10.1021/bi00527a029
发表时间: 1981-01-01
期刊: BIOCHEMISTRY
影响因子: 2.9
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期刊: SCIENCE
影响因子: 56.9
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DOI: 10.1093/nar/23.14.2715
发表时间: 1995-07-25
影响因子: 14.9
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DOI: 10.1021/bi00527a028
发表时间: 1981-01-01
期刊: BIOCHEMISTRY
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