Structural basis of DNA ligase IV-Artemis interaction in nonhomologous end-joining.

Structural basis of DNA ligase IV-Artemis interaction in nonhomologous end-joining.
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DOI:
10.1016/j.celrep.2012.11.004
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发表时间:
2012-12-27
期刊:
影响因子:
8.8
通讯作者:
Aggarwal AK
Aggarwal AK
中科院分区:
生物学1区
文献类型:
--
作者:
De Ioannes P;Malu S;Cortes P;Aggarwal AK

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DNA连接酶IV(LigIV)和Artemis是V(D)J重组和维持哺乳动物细胞中基因组完整性所需的非同源末端连接(NHEJ)机制的核心组分。我们在这里报告晶体结构的LigIV DNA结合结构域(DBD)在其载脂蛋白形式和复杂的肽来自Artemis C-末端区域。我们表明,LigIV通过扩展的疏水表面与Artemis相互作用。特别是,我们发现LigIV DBD中的螺旋α2比其他哺乳动物连接酶中的螺旋α 2长,并且存在与在结合时采用β-螺旋构象的Artemis肽特异性相互作用的残基。LigIV DBD疏水表面上的关键残基的突变消除了相互作用。总之,我们的研究结果提供了结构的见解LigIV-Artemis相互作用的特异性,以及如何在NHEJ过程中协调两种蛋白质的酶活性。
DNA ligase IV (LigIV) and Artemis are central components of the Non-Homologous End Joining (NHEJ) machinery that is required for V(D)J recombination and the maintenance of genomic integrity in mammalian cells. We report here crystal structures of the LigIV DNA binding domain (DBD) in both its apo form and in complex with a peptide derived from the Artemis C-terminal region. We show that LigIV interacts with Artemis through an extended hydrophobic surface. In particular, we find that helix α2 in LigIV DBD is longer than in other mammalian ligases and presents residues which specifically interact with the Artemis peptide that adopts a beta-helix conformation on binding. Mutations of key residues on the LigIV DBD hydrophobic surface abolish the interaction. Together, our results provide structural insights into the specificity of LigIV-Artemis interaction and how the enzymatic activities of the two proteins may be coordinated during NHEJ.
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发表时间: 1998-10-01
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