Mammalian DNA polymerase auxiliary proteins: analysis of replication factor C-catalyzed proliferating cell nuclear antigen loading onto circular double-stranded DNA

Mammalian DNA polymerase auxiliary proteins: analysis of replication factor C-catalyzed proliferating cell nuclear antigen loading onto circular double-stranded DNA
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哺乳动物 DNA 聚合酶辅助蛋白:分析复制因子 C 催化的增殖细胞核抗原加载到环状双链 DNA 上

DOI:
10.1128/mcb.15.6.3072
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发表时间:
1995
影响因子:
5.3
通讯作者:
Ulrich Hübscher
Ulrich Hübscher
中科院分区:
生物学2区
文献类型:
--
作者:
L. Podust;V. Podust;J. Sogo;Ulrich Hübscher

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为了解增殖细胞核抗原和复制因子C这两种真核复制辅助蛋白的作用机制,我们构建了一种可在体外进行32P标记的增殖细胞核抗原表达载体。这使我们能够分析辅助蛋白质在DNA上的直接组装,并在没有DNA合成的情况下检查这一过程。用闭合环状双链DNA或有间隙环状DNA形成蛋白质-DNA复合体,结果表明:(1)RF-C能以依赖于ATP的方式将增殖细胞核抗原直接负载到双链DNA上,不需要3‘-羟基末端;(2)组装在闭合环状DNA上的RF-C-PCNA复合体与组装在有间隙或有缺口的环状DNA上的不同;(3)稳定的RF-C-PCNA复合体可以组装在环状DNA上,但不能组装在线形DNA上;当模板线性化时,只有有间隙的DNA才能部分保留组装的RF-C-增殖细胞核抗原复合体。我们认为,在ATP存在的情况下,RF-C首先非特异性地与双链DNA结合,然后将增殖细胞核抗原装载到DNA上,产生能够沿着DNA追踪的蛋白质复合体。RF-C-增殖细胞核抗原复合体可以沿着模板滑动,直到它遇到3‘-OH引物-模板连接,在那里它很可能转化为一个合格的钳子。最后,后一种复合体可能仍然能够沿着双链DNA滑动。
To understand the mechanism of action of the two eukaryotic replication auxiliary proteins proliferating cell nuclear antigen (PCNA) and replication factor C (RF-C), we constructed a plasmid for producing PCNA which could be 32P labelled in vitro. This allowed us to analyze the assembly of the auxiliary proteins directly on DNA and to examine this process in the absence of DNA synthesis. By using closed circular double-stranded DNA or gapped circular DNA for protein-DNA complex formation, the following results were obtained, (i) RF-C can load PCNA in an ATP-dependent manner directly on double-stranded DNA, and no 3'-OH ends are required for this reaction; (ii) the RF-C-PCNA complex assembled on closed circular DNA differs from those assembled on gapped or nicked circular DNA; (iii) the stable RF-C-PCNA complex can be assembled on circular but not on linear DNA; and (iv) only gapped DNA can partially retain the assembled RF-C-PCNA complex upon the linearization of the template. We propose that RF-C first binds unspecifically to double-stranded DNA in the presence of ATP and then loads PCNA onto DNA to yield a protein complex able to track along DNA. The RF-C-PCNA complex could slide along the template until it encounters a 3'-OH primer-template junction, where it is likely transformed into a competent clamp. The latter complex, finally, might still be able to slide along double-stranded DNA.
DOI: 10.1016/s0021-9258(18)99166-0
发表时间: 1991-06
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影响因子: --
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DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
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