An autoregulatory mechanism imposes allosteric control on the V(D)J recombinase by histone H3 methylation.

An autoregulatory mechanism imposes allosteric control on the V(D)J recombinase by histone H3 methylation.
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DOI:
10.1016/j.celrep.2014.12.001
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发表时间:
2015-01-06
期刊:
影响因子:
8.8
通讯作者:
Desiderio S
Desiderio S
中科院分区:
生物学1区
文献类型:
--
作者:
Lu C;Ward A;Bettridge J;Liu Y;Desiderio S

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V(D)J 重组由由 RAG-1 和 RAG-2 亚基组成的特殊转座酶启动。基因片段对 V(D)J 重组酶 DNA 切割的敏感性与活性染色质的表观遗传修饰特征相关,包括组蛋白 H3 在赖氨酸 4 (H3K4me3) 上的三甲基化。 RAG-2 中的植物同源结构域 (PHD) 与 H3K4me3 的结合可促进体内重组,并在体外刺激 RAG 对 DNA 的切割。我们现在表明,H3K4me3 在 PHD 指上以变构方式起作用,以减轻 RAG-2 内单独结构域施加的自抑制。该自抑制结构域的破坏与重组频率、DNA 切割活性、底物结合亲和力和催化速率的组成性增加相关,从而模拟了 H3K4me3 的刺激作用。我们的观察结果支持一个模型,其中 RAG 的变构控制是由自动抑制域强制执行的,其作用通过活性染色质的参与而减轻。
V(D)J recombination is initiated by a specialized transposase consisting of the subunits RAG-1 and RAG-2. The susceptibility of gene segments to DNA cleavage by the V(D)J recombinase is correlated with epigenetic modifications characteristic of active chromatin, including trimethylation of histone H3 on lysine 4 (H3K4me3). Engagement of H3K4me3 by a plant homeodomain (PHD) in RAG-2 promotes recombination in vivo and stimulates DNA cleavage by RAG in vitro. We now show that H3K4me3 acts allosterically at the PHD finger to relieve autoinhibition imposed by a separate domain within RAG-2. Disruption of this autoinhibitory domain was associated with constitutive increases in recombination frequency, DNA cleavage activity, substrate binding affinity and catalytic rate, thus mimicking the stimulatory effects of H3K4me3. Our observations support a model in which allosteric control of RAG is enforced by an autoinhibitory domain whose action is relieved by engagement of active chromatin.
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