Human Xeroderma Pigmentosum Group A Protein Interacts with Human Replication Protein A and Inhibits DNA Replication (*)

Human Xeroderma Pigmentosum Group A Protein Interacts with Human Replication Protein A and Inhibits DNA Replication (*)
复制标题

人类色素干皮病 A 组蛋白与人类复制蛋白 A 相互作用并抑制 DNA 复制 (*)

DOI:
10.1074/jbc.270.37.21800
复制
发表时间:
1995
期刊:
The Journal of Biological Chemistry
影响因子:
--
通讯作者:
R. Drissi
R. Drissi
中科院分区:
--
文献类型:
--
作者:
Suk;Dong;R. Drissi

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参考文献

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相似文献

人类复制蛋白A(RPA;也称为人类单链DNA结合蛋白,或HSSB)是一种参与DNA复制和修复的多亚基复合物。虽然RPA在复制中的作用已经得到了很好的研究,但其在修复中的功能尚不清楚,尽管已知它参与了修复过程的早期阶段。我们发现RPA与着色性干皮病A组互补蛋白(XPAC)相互作用,XPAC是一种特异性识别紫外线损伤DNA的蛋白质。我们研究了这种XPAC-RPA相互作用对体外猴病毒40(SV 40)DNA复制的单聚合酶系统催化的效果。XPAC在体外可抑制SV 40 DNA复制,这种抑制作用可被RPA逆转,但不能被DNA聚合酶α-引物酶复合物、SV 40大肿瘤抗原或拓扑异构酶I逆转。这种抑制不是由于XPAC和单链DNA(ssDNA)之间的相互作用,也不是由于RPA和XPAC之间对DNA结合的竞争,因为XPAC不显示任何ssDNA结合活性,事实上,刺激RPA的ssDNA结合活性。此外,XPAC在RPA存在下抑制DNA聚合酶α活性,但在RPA不存在下不抑制。这些结果表明,XPAC对DNA复制的抑制作用可能是通过与RPA的相互作用实现的。
Human replication protein A (RPA; also known as human single-stranded DNA binding protein, or HSSB) is a multisubunit complex involved in both DNA replication and repair. While the role of RPA in replication has been well studied, its function in repair is less clear, although it is known to be involved in the early stages of the repair process. We found that RPA interacts with xeroderma pigmentosum group A complementing protein (XPAC), a protein that specifically recognizes UV-damaged DNA. We examined the effect of this XPAC-RPA interaction on in vitro simian virus 40 (SV40) DNA replication catalyzed by the monopolymerase system. XPAC inhibited SV40 DNA replication in vitro, and this inhibition was reversed by the addition of RPA but not by the addition of DNA polymerase α-primase complex, SV40 large tumor antigen, or topoisomerase I. This inhibition did not result from an interaction between XPAC and single-stranded DNA (ssDNA), or from competition between RPA and XPAC for DNA binding, because XPAC does not show any ssDNA binding activity and, in fact, stimulates RPA's ssDNA binding activity. Furthermore, XPAC inhibited DNA polymerase α activity in the presence of RPA but not in RPA's absence. These results suggest that the inhibitory effect of XPAC on DNA replication probably occurs through its interaction with RPA.
用纯化的蛋白质重建猿猴病毒 40 DNA 复制。
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影响因子: 11.1
作者:
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包含 SV40 复制起点的 DNA 的完整酶促合成。
DOI: --
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DOI: --
发表时间: 1990
期刊: The Journal of biological chemistry
影响因子: --
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通讯作者: Suk-Hee Lee;Ann D. Kwong;Zhen-Qiang Pan;J. Hurwitz