5S RNA gene specific transcription factor (TFIIIA) changes the linking number of the DNA.

5S RNA gene specific transcription factor (TFIIIA) changes the linking number of the DNA.
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5S RNA 基因特异性转录因子 (TFIIIA) 改变 DNA 的连接数。

DOI:
10.1016/0006-291x(86)90362-1
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发表时间:
1986
影响因子:
3.1
通讯作者:
B. Shastry
B. Shastry
中科院分区:
生物学4区
文献类型:
--
作者:
B. Shastry

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纯化的5S基因特异性转录因子A(TFIIIA),当在拓扑异构酶I的存在下与松弛的5S基因一起孵育时,改变DNA的构象,导致连接数的变化。这种相互作用在低浓度的DNA与蛋白质(1:2)下引入每个TFIIIA结合位点1bp的变化,在较高的蛋白质浓度(1:12)下增加到每个TFIIIA结合位点0.9转(9bp)的程度。这些分析支持这样的观点,即TFIIIA与5S DNA的结合在环状DNA分子的拓扑结构中引入了最小的变化。
The purified 5S gene specific transcription factor A (TFIIIA), when incubated with the relaxed 5S gene in the presence of topoisomerase I alters the conformation of the DNA, resulting in a change in the linking number. This interaction introduces a change of one bp per TFIIIA binding site at a low concentration of DNA to protein (1:2) which increases to an extent of 0.9 turns (9 bp) per TFIIIA binding site at a higher protein concentration (1:12). These analyses support the notion that the binding of TFIIIA to the 5S DNA introduces a minimal change in the topology of circular DNA molecules.