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体外转录的SV40微型染色体,与大量微型染色体一样,具有低水平的无约束负超螺旋。

In vitro transcribed SV40 minichromosomes, as the bulk minichromosomes, have a low level of unconstrained negative supercoils.

作者信息

Choder M, Aloni Y

机构信息

Department of Genetics, Weizmann Institute of Science, Rehovot, Israel.

出版信息

Nucleic Acids Res. 1988 Feb 11;16(3):895-905. doi: 10.1093/nar/16.3.895.

DOI:10.1093/nar/16.3.895
PMID:2830595
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC334726/
Abstract

The method for detecting the small fraction (1%) of transcriptionally active SV40 minichromosomes, in the presence of the bulk minichromosomes, (14) has been applied to directly analyze the topology of transcribed and non-transcribed minichromosomal DNA. We show here that DNA of both transcribed and non-transcribed minichromosomes have the same number of supercoils which are constrained by nucleosomes. In addition, minichromosomal DNA of both fractions have a low level of unconstrained supercoils (1-2 extra supercoils) which can be relaxed in vitro by topoisomerase I.

摘要

在存在大量微小染色体的情况下,检测转录活性SV40微小染色体的小部分(1%)的方法(14)已被用于直接分析转录和未转录的微小染色体DNA的拓扑结构。我们在此表明,转录和未转录的微小染色体的DNA具有相同数量的由核小体限制的超螺旋。此外,这两个部分的微小染色体DNA都有低水平的未受限制的超螺旋(1 - 2个额外的超螺旋),其在体外可被拓扑异构酶I松弛。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e1/334726/3c9f4112c421/nar00145-0121-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e1/334726/12765001566e/nar00145-0119-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e1/334726/3c9f4112c421/nar00145-0121-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e1/334726/12765001566e/nar00145-0119-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e1/334726/3c9f4112c421/nar00145-0121-a.jpg

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1
In vitro transcribed SV40 minichromosomes, as the bulk minichromosomes, have a low level of unconstrained negative supercoils.体外转录的SV40微型染色体,与大量微型染色体一样,具有低水平的无约束负超螺旋。
Nucleic Acids Res. 1988 Feb 11;16(3):895-905. doi: 10.1093/nar/16.3.895.
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引用本文的文献

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DNA-protein interactions and spatial organization of DNA.DNA与蛋白质的相互作用及DNA的空间组织
Mol Biol Rep. 1993 Oct;18(3):167-75. doi: 10.1007/BF01674427.
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DNA superhelicity enhances the assembly of transcriptionally active chromatin in vitro.DNA超螺旋在体外增强转录活性染色质的组装。

本文引用的文献

1
Catenation of DNA by eucaryotic topoisomerase II associated with simian virus 40 minichromosomes.与猿猴病毒40微型染色体相关的真核拓扑异构酶II对DNA的连环化作用。
EMBO J. 1983;2(8):1255-61. doi: 10.1002/j.1460-2075.1983.tb01578.x.
2
Control of late simian virus 40 transcription by the attenuation mechanism and transcriptionally active ternary complexes are associated with the nuclear matrix.晚期猿猴病毒40转录通过衰减机制的调控以及转录活性三元复合物与核基质相关。
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Enhancer-activated plasmid transcription complexes contain constrained supercoiling.增强子激活的质粒转录复合物含有受限超螺旋。
Nucleic Acids Res. 1991 Jul 25;19(14):3965-71. doi: 10.1093/nar/19.14.3965.
7
Effects of histone acetylation on chromatin topology in vivo.组蛋白乙酰化对体内染色质拓扑结构的影响。
Mol Cell Biol. 1992 Nov;12(11):5004-14. doi: 10.1128/mcb.12.11.5004-5014.1992.
真核生物DNA拓扑异构酶I与核小体及染色体蛋白的关联
Nucleic Acids Res. 1983 Jan 25;11(2):461-72. doi: 10.1093/nar/11.2.461.
4
Torsional tension in the DNA double helix measured with trimethylpsoralen in living E. coli cells: analogous measurements in insect and human cells.利用三甲基补骨脂素在活的大肠杆菌细胞中测量DNA双螺旋的扭转张力:在昆虫和人类细胞中的类似测量
Cell. 1980 Oct;21(3):773-83. doi: 10.1016/0092-8674(80)90440-7.
5
Absence of nucleosomes in a fraction of SV40 chromatin between the origin of replication and the region coding for the late leader RNA.在SV40染色质中,复制起点与晚期前导RNA编码区域之间的一部分区域不存在核小体。
Cell. 1980 May;20(1):65-73. doi: 10.1016/0092-8674(80)90235-4.
6
A nucleosome-free region in SV40 minichromosomes.猴病毒40型(SV40)微型染色体中的无核小体区域。
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7
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8
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Cell. 1987 Jan 30;48(2):289-95. doi: 10.1016/0092-8674(87)90432-6.