DNA damage-dependent interaction of the nuclear matrix protein C1D with Translin-associated factor X (TRAX).

DNA damage-dependent interaction of the nuclear matrix protein C1D with Translin-associated factor X (TRAX).
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核基质蛋白 C1D 与 Translin 相关因子 X (TRAX) 之间的 DNA 损伤依赖性相互作用。

DOI:
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发表时间:
2002
影响因子:
4
通讯作者:
U. Yavuzer
U. Yavuzer
中科院分区:
生物学2区
文献类型:
--
作者:
T. Erdemir;B. Bilican;Dilhan Oncel;C. Goding;U. Yavuzer

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核基质蛋白C1D是DNA依赖蛋白激酶(DNA-PK)的激活物,对DNA双链断裂(DSB)和V(D)J重组的修复至关重要。C1D被DNA-PK有效地磷酸化,其mRNA和蛋白水平在伽玛射线照射后被诱导,提示C1D在体内可能在双链断裂的修复中发挥作用。为了确定C1D的生物学功能,我们使用了酵母双杂交系统,发现C1D与Translin相关因子X,Trax特异地相互作用。尽管Trax的生物学功能尚不清楚,但其两部分核靶向序列表明Trax在包括Translin在内的相关蛋白质进入细胞核的过程中发挥了作用。我们发现C1D和Trax在酵母和哺乳动物细胞中都有特异性的相互作用。然而,有趣的是,这两种蛋白质在哺乳动物细胞中的相互作用仅发生在伽马辐射后,这增加了Trax参与DNA双链断裂修复的可能性,并为核基质蛋白C1D和Trax的生物学功能提供了证据。此外,我们使用荧光标记的蛋白质显示,Trax和Translin的相对表达水平影响它们的亚细胞定位。这些结果表明,C1D的作用之一可能是调节Trax/Translin复合体的形成。
The nuclear matrix protein C1D is an activator of the DNA-dependent protein kinase (DNA-PK), which is essential for the repair of DNA double-strand breaks (DSBs) and V(D)J recombination. C1D is phosphorylated very efficiently by DNA-PK, and its mRNA and protein levels are induced upon gamma-irradiation, suggesting that C1D may play a role in repair of DSBs in vivo. In an attempt to identify the biological function of C1D, we have employed the yeast two-hybrid system and found that C1D interacts specifically with Translin-associated factor X, TRAX. Although the biological function of TRAX remains unknown, its bipartite nuclear targeting sequences suggest a role for TRAX in the movement of associated proteins, including Translin, into the nucleus. We show that C1D and TRAX interact specifically in both yeast and mammalian cells. Interestingly, however, interaction of these two proteins in mammalian cells only occur following gamma-irradiation, raising the possibility of involvement of TRAX in DNA double-strand break repair and providing evidence for biological functions of the nuclear matrix protein C1D and TRAX. Moreover, we show, using fluorescently tagged proteins, that the relative expression levels of TRAX and Translin affect their subcellular localization. These results suggest that one role for C1D may be to regulate TRAX/Translin complex formation.
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